Lines Matching +full:ipv4 +full:- +full:second +full:- +full:language +full:- +full:is +full:- +full:cpp

8 *Release date: 2023-06-06*
11 --------
13 - gh-issue-103142: The version of OpenSSL used in our binary builds has been
16 - gh-issue-99889: Fixed a security in flaw in :func:`uu.decode` that could
20 - gh-issue-104049: Do not expose the local on-disk location in directory
23 - gh-issue-102153: :func:`urllib.parse.urlsplit` now strips leading C0
25   by WHATWG in response to CVE-2023-24329. Patch by Illia Volochii.
28 -----------------
30 - gh-issue-105164: Ensure annotations are set up correctly if the only
31   annotation in a block is within a :keyword:`match` block. Patch by Jelle
34 - gh-issue-104615: Fix wrong ordering of assignments in code like ``a, a =
37 - gh-issue-104482: Fix three error handling bugs in ast.c's validation of
40 - gh-issue-102818: Do not add a frame to the traceback in the
42   that frames are not duplicated if an exception is raised in the callback
43   function, and ensures that frames are not omitted if a C callback is used
46 - gh-issue-104405: Fix an issue where some :term:`bytecode` instructions
49 - gh-issue-104018: Disallow the "z" format specifier in %-format of bytes
52 - gh-issue-103971: Fix an issue where incorrect locations numbers could be
55 - gh-issue-102310: Change the error range for invalid bytes literals.
57 - gh-issue-103590: Do not wrap a single exception raised from a
58   ``try-except*`` construct in an :exc:`ExceptionGroup`.
60 - gh-issue-101517: Fix bug in line numbers of instructions emitted for
63 - gh-issue-103242: Migrate :meth:`~ssl.SSLContext.set_ecdh_curve` method not
64   to use deprecated OpenSSL APIs. Patch by Dong-hee Na.
66 - gh-issue-102700: Allow built-in modules to be submodules. This allows
69 - gh-issue-101857: Fix xattr support detection on Linux systems by widening
72 - gh-issue-99184: Bypass instance attribute access of ``__name__`` in
75 - gh-issue-96670: The parser now raises :exc:`SyntaxError` when parsing
79 - bpo-31821: Fix :func:`!pause_reading` to work when called from
83 -------
85 - gh-issue-105080: Fixed inconsistent signature on derived classes for
88 - gh-issue-104874: Document the ``__name__`` and ``__supertype__``
91 - gh-issue-104340: When an ``asyncio`` pipe protocol loses its connection
95   ``StreamWriter.close()`` docs, the ``wait_closed()`` call is optional
98 - gh-issue-104372: Refactored the ``_posixsubprocess`` internals to avoid
102 - gh-issue-75367: Fix data descriptor detection in
105 - gh-issue-104536: Fix a race condition in the internal
109 - gh-issue-104399: Prepare the ``_tkinter`` module for building with Tcl 9.0
114 - gh-issue-104307: :func:`socket.getnameinfo` now releases the GIL while
117 - gh-issue-87695: Fix issue where :meth:`pathlib.Path.glob` raised
120 - gh-issue-104265: Prevent possible crash by disallowing instantiation of
125 - gh-issue-104035: Do not ignore user-defined ``__getstate__`` and
128 - gh-issue-103987: In :mod:`mmap`, fix several bugs that could lead to
129   access to memory-mapped files after they have been invalidated.
131 - gh-issue-103935: Use :func:`io.open_code` for files to be executed instead
134 - gh-issue-100370: Fix potential :exc:`OverflowError` in
135   :meth:`sqlite3.Connection.blobopen` for 32-bit builds. Patch by Erlend E.
138 - gh-issue-103848: Add checks to ensure that ``[`` bracketed ``]`` hosts
141 - gh-issue-103872: Update the bundled copy of pip to version 23.1.2.
143 - gh-issue-103861: Fix ``zipfile.Zipfile`` creating invalid zip files when
146 - gh-issue-103685: Prepare :meth:`tkinter.Menu.index` for Tk 8.7 so that it
150 - gh-issue-81403: :class:`urllib.request.CacheFTPHandler` no longer raises
151   :class:`URLError` if a cached FTP instance is reused. ftplib's endtransfer
155 - gh-issue-103578: Fixed a bug where :mod:`pdb` crashes when reading source
160 - gh-issue-103556: Now creating :class:`inspect.Signature` objects with
161   positional-only parameter with a default followed by a
162   positional-or-keyword parameter without one is impossible.
164 - gh-issue-103559: Update the bundled copy of pip to version 23.1.1.
166 - gh-issue-103365: Set default Flag boundary to ``STRICT`` and fix bitwise
169 - gh-issue-103472: Avoid a potential :exc:`ResourceWarning` in
173 - gh-issue-103449: Fix a bug in doc string generation in
176 - gh-issue-103256: Fixed a bug that caused :mod:`hmac` to raise an exception
179   back properly to the built-in. This could happen when, for example, your
183 - gh-issue-103225: Fix a bug in :mod:`pdb` when displaying line numbers of
184   module-level source code.
186 - gh-issue-93910: Remove deprecation of enum ``memmber.member`` access.
188 - gh-issue-102978: Fixes :func:`unittest.mock.patch` not enforcing function
190   ``@staticmethod`` when patch is called with ``autospec=True``.
192 - gh-issue-103204: Fixes :mod:`http.server` accepting HTTP requests with
193   HTTP version numbers preceded by '+', or '-', or with digit-separating '_'
194   characters.  The length of the version numbers is also constrained.
196 - gh-issue-102953: The extraction methods in :mod:`tarfile`, and
200   :ref:`tarfile-extraction-filter` for details.
202 - gh-issue-101640: :class:`argparse.ArgumentParser` now catches errors when
203   writing messages, such as when :data:`sys.stderr` is ``None``. Patch by
206 - gh-issue-96522: Fix potential deadlock in pty.spawn()
208 - gh-issue-87474: Fix potential file descriptor leaks in
212 -------------
214 - gh-issue-89455: Add missing documentation for the ``max_group_depth`` and
218 - gh-issue-89412: Add missing documentation for the ``end_lineno`` and
222 - gh-issue-104943: Remove mentions of old Python versions in
225 - gh-issue-67056: Document that the effect of registering or unregistering
227   function is undefined.
229 - gh-issue-48241: Clarifying documentation about the url parameter to
234 -----
236 - gh-issue-104494: Update ``test_pack_configure_in`` and
240 - gh-issue-104461: Run test_configure_screen on X11 only, since the
241   ``DISPLAY`` environment variable and ``-screen`` option for toplevels are
244 - gh-issue-103329: Regression tests for the behaviour of
247 - gh-issue-85984: Utilize new "winsize" functions from termios in pty tests.
249 - gh-issue-75729: Fix the :func:`os.spawn* <os.spawnl>` tests failing on
253 -----
255 - gh-issue-90005: Fix a regression in :file:`configure` where we could end
258 - gh-issue-104106: Add gcc fallback of mkfifoat/mknodat for macOS. Patch by
259   Dong-hee Na.
261 - gh-issue-99069: Extended workaround defining ``static_assert`` when
266 -------
268 - gh-issue-105146: Updated the links at the end of the installer to point to
271 - gh-issue-104623: Update Windows installer to use SQLite 3.42.0.
273 - gh-issue-102997: Update Windows installer to use SQLite 3.41.2.
275 - gh-issue-88013: Fixed a bug where :exc:`TypeError` was raised when calling
279 -----
281 - gh-issue-103142: Update macOS installer to use OpenSSL 1.1.1u.
283 - gh-issue-104623: Update macOS installer to SQLite 3.42.0.
285 - gh-issue-102997: Update macOS installer to SQLite 3.41.2.
288 ----
290 - gh-issue-104719: Remove IDLE's modification of tokenize.tabsize and test
293 - gh-issue-104499: Fix completions for Tk Aqua 8.7 (currently blank).
295 - gh-issue-104496: About prints both tcl and tk versions if different
298 - gh-issue-88496: Fix IDLE test hang on macOS.
304 *Release date: 2023-04-04*
307 --------
309 - gh-issue-101727: Updated the OpenSSL version used in Windows and macOS
310   binary release builds to 1.1.1t to address CVE-2023-0286, CVE-2022-4303,
311   and CVE-2022-4303 per `the OpenSSL 2023-02-07 security advisory
314 - gh-issue-101283: :class:`subprocess.Popen` now uses a safer approach to
319 -----------------
321 - gh-issue-101975: Fixed ``stacktop`` value on tracing entries to avoid
324 - gh-issue-102701: Fix overflow when creating very large dict.
326 - gh-issue-102416: Do not memoize incorrectly automatically generated loop
329 - gh-issue-102356: Fix a bug that caused a crash when deallocating deeply
332 - gh-issue-102397: Fix segfault from race condition in signal handling
335 - gh-issue-102281: Fix potential nullptr dereference and use of
338 - gh-issue-102126: Fix deadlock at shutdown when clearing thread states if
342 - gh-issue-102027: Fix SSE2 and SSE3 detection in ``_blake2`` internal
345 - gh-issue-101967: Fix possible segfault in
348 - gh-issue-101765: Fix SystemError / segmentation fault in iter
352 - gh-issue-101696: Invalidate type version tag in ``_PyStaticType_Dealloc``
357 -------
359 - gh-issue-102549: Don't ignore exceptions in member type creation.
361 - gh-issue-102947: Improve traceback when :func:`dataclasses.fields` is
362   called on a non-dataclass. Patch by Alex Waygood
364 - gh-issue-102780: The :class:`asyncio.Timeout` context manager now works
369 - gh-issue-88965: typing: Fix a bug relating to substitution in custom
373   not be subsequently substituted. This is now fixed.
377 - gh-issue-101979: Fix a bug where parentheses in the ``metavar`` argument
381 - gh-issue-102179: Fix :func:`os.dup2` error message for negative fds.
383 - gh-issue-101961: For the binary mode, :func:`fileinput.hookcompressed`
384   doesn't set the ``encoding`` value even if the value is ``None``. Patch by
387 - gh-issue-101936: The default value of ``fp`` becomes :class:`io.BytesIO`
388   if :exc:`~urllib.error.HTTPError` is initialized without a designated
391 - gh-issue-102069: Fix ``__weakref__`` descriptor generation for custom
394 - gh-issue-101566: In zipfile, apply fix for extractall on the underlying
397 - gh-issue-101892: Callable iterators no longer raise :class:`SystemError`
401 - gh-issue-97786: Fix potential undefined behaviour in corner cases of
402   floating-point-to-time conversions.
404 - gh-issue-101517: Fixed bug where :mod:`bdb` looks up the source line with
408 - gh-issue-101673: Fix a :mod:`pdb` bug where ``ll`` clears the changes to
411 - gh-issue-96931: Fix incorrect results from
414 - gh-issue-88233: Correctly preserve "extra" fields in ``zipfile``
417 - gh-issue-96127: ``inspect.signature`` was raising ``TypeError`` on call
421 - gh-issue-95495: When built against OpenSSL 3.0, the :mod:`ssl` module had
423   as a clean TLS-level EOF. It now raises :exc:`~ssl.SSLEOFError`, matching
429 - gh-issue-94440: Fix a :mod:`concurrent.futures.process` bug where
434 -------------
436 - gh-issue-103112: Add docstring to :meth:`http.client.HTTPResponse.read` to
439 - gh-issue-85417: Update :mod:`cmath` documentation to clarify behaviour on
442 - gh-issue-97725: Fix :meth:`asyncio.Task.print_stack` description for
446 -----
448 - gh-issue-102980: Improve test coverage on :mod:`pdb`.
450 - gh-issue-102537: Adjust the error handling strategy in
453 - gh-issue-89792: ``test_tools`` now copies up to 10x less source data to a
458 - gh-issue-101377: Improved test_locale_calendar_formatweekday of calendar.
461 -----
463 - gh-issue-102711: Fix ``-Wstrict-prototypes`` compiler warnings.
466 -------
468 - gh-issue-101849: Ensures installer will correctly upgrade existing
471 - gh-issue-101763: Updates copy of libffi bundled with Windows installs to
474 - gh-issue-101759: Update Windows installer to SQLite 3.40.1.
476 - gh-issue-101614: Correctly handle extensions built against debug binaries
480 -----
482 - gh-issue-103207: Add instructions to the macOS installer welcome display
486 - gh-issue-101759: Update macOS installer to SQLite 3.40.1.
492 *Release date: 2023-02-07*
495 -----------------
497 - gh-issue-92173: Fix the ``defs`` and ``kwdefs`` arguments to
500 - gh-issue-101400: Fix wrong lineno in exception message on
502   Dong-hee Na.
504 - gh-issue-101372: Fix :func:`~unicodedata.is_normalized` to properly handle
505   the UCD 3.2.0 cases. Patch by Dong-hee Na.
507 - gh-issue-101046: Fix a possible memory leak in the parser when raising
510 - gh-issue-101037: Fix potential memory underallocation issue for instances
513 - gh-issue-100942: Fixed segfault in property.getter/setter/deleter that
515   return a non-property instance.
517 - gh-issue-100892: Fix race while iterating over thread states in clearing
520 - gh-issue-100776: Fix misleading default value in :func:`input`'s
523 - gh-issue-100637: Fix :func:`int.__sizeof__` calculation to include the 1
526 - gh-issue-100649: Update the native_thread_id field of PyThreadState after
529 - gh-issue-100374: Fix incorrect result and delay in :func:`socket.getfqdn`.
532 - gh-issue-99110: Initialize frame->previous in frameobject.c to fix a
535 - gh-issue-100050: Honor existing errors obtained when searching for
538 - bpo-32782: ``ctypes`` arrays of length 0 now report a correct itemsize
539   when a ``memoryview`` is constructed from them, rather than always giving
543 -------
545 - gh-issue-101541: [Enum] - fix psuedo-flag creation
547 - gh-issue-101326: Fix regression when passing ``None`` as second or third
550 - gh-issue-100795: Avoid potential unexpected ``freeaddrinfo`` call (double
555 - gh-issue-101143: Remove unused references to :class:`~asyncio.TimerHandle`
558 - gh-issue-101144: Make :func:`zipfile.Path.open` and
564 - gh-issue-101015: Fix :func:`typing.get_type_hints` on ``'*tuple[...]'``
567 - gh-issue-100573: Fix a Windows :mod:`asyncio` bug with named pipes where a
571 - gh-issue-100805: Modify :func:`random.choice` implementation to once again
574 - gh-issue-90104: Avoid RecursionError on ``repr`` if a dataclass field
577 - gh-issue-100750: pass encoding kwarg to subprocess in platform
579 - gh-issue-100689: Fix crash in :mod:`pyexpat` by statically allocating
582 - gh-issue-100740: Fix ``unittest.mock.Mock`` not respecting the spec for
585 - gh-issue-86508: Fix :func:`asyncio.open_connection` to skip binding to
588 - gh-issue-100287: Fix the interaction of :func:`unittest.mock.seal` with
591 - gh-issue-100474: :mod:`http.server` now checks that an index page is
595 - gh-issue-100160: Remove any deprecation warnings in
598 - gh-issue-96290: Fix handling of partial and invalid UNC drives in
599   ``ntpath.splitdrive()``, and in ``ntpath.normpath()`` on non-Windows
602   modified by ``normpath()`` on non-Windows systems. The behaviour of
603   ``normpath()`` on Windows systems is unaffected, as native OS APIs are
606 - gh-issue-78878: Fix crash when creating an instance of
609 - gh-issue-99952: Fix a reference undercounting issue in
613 - gh-issue-100133: Fix regression in :mod:`asyncio` where a subprocess would
616 - gh-issue-100098: Fix ``tuple`` subclasses being cast to ``tuple`` when
619 - gh-issue-98778: Update :exc:`~urllib.error.HTTPError` to be initialized
620   properly, even if the ``fp`` is ``None``. Patch by Dong-hee Na.
622 - gh-issue-83035: Fix :func:`inspect.getsource` handling of decorator calls
625 - gh-issue-99576: Fix ``.save()`` method for ``LWPCookieJar`` and
628 - gh-issue-99433: Fix :mod:`doctest` failure on
631 - gh-issue-99240: Fix double-free bug in Argument Clinic ``str_converter``
634 - gh-issue-64490: Fix refcount error when arguments are packed to tuple in
637 - gh-issue-85267: Several improvements to :func:`inspect.signature`'s
638   handling of ``__text_signature``. - Fixes a case where
639   :func:`inspect.signature` dropped parameters - Fixes a case where
640   :func:`inspect.signature` raised :exc:`tokenize.TokenError` - Allows
642   operations of constants - :func:`inspect.signature` is documented as only
644   :exc:`RuntimeError`. These cases now raise :exc:`ValueError` - Removed a
647 - gh-issue-95882: Fix a 3.11 regression in
653 - bpo-44817: Ignore WinError 53 (ERROR_BAD_NETPATH), 65
657 - bpo-40447: Accept :class:`os.PathLike` (such as :class:`pathlib.Path`) in
661 - bpo-36880: Fix a reference counting issue when a :mod:`ctypes` callback
666 -------------
668 - gh-issue-100616: Document existing ``attr`` parameter to
671 - gh-issue-100472: Remove claim in documentation that the ``stripdir``,
676 - gh-issue-99931: Use `sphinxext-opengraph
677   <https://sphinxext-opengraph.readthedocs.io/>`__ to generate `OpenGraph
681 -----
683 - gh-issue-101334: ``test_tarfile`` has been updated to pass when run as a
686 - gh-issue-100454: Start running SSL tests with OpenSSL 3.1.0-beta1.
688 - gh-issue-96002: Add functional test for Argument Clinic.
691 -----
693 - gh-issue-101522: Allow overriding Windows dependencies versions and paths
697 -------
699 - gh-issue-101543: Ensure the install path in the registry is only used when
702 - gh-issue-101467: The ``py.exe`` launcher now correctly filters when only a
703   single runtime is installed. It also correctly handles prefix matches on
704   tags so that ``-3.1`` does not match ``3.11``, but would still match
705   ``3.1-32``.
707 - gh-issue-101135: Restore ability to launch older 32-bit versions from the
708   :file:`py.exe` launcher when both 32-bit and 64-bit installs of the same
711 - gh-issue-82052: Fixed an issue where writing more than 32K of Unicode
714 - gh-issue-100320: Ensures the ``PythonPath`` registry key from an install
715   is used when launching from a different copy of Python that relies on an
718 - gh-issue-100247: Restores support for the :file:`py.exe` launcher finding
721 - gh-issue-100180: Update Windows installer to OpenSSL 1.1.1s
723 - bpo-43984: :meth:`winreg.SetValueEx` now leaves the target value untouched
724   in the case of conversion errors. Previously, ``-1`` would be written in
728 -----
730 - gh-issue-100180: Update macOS installer to OpenSSL 1.1.1s
733 -----------
735 - bpo-45256: Fix a bug that caused an :exc:`AttributeError` to be raised in
736   ``python-gdb.py`` when ``py-locals`` is used without a frame.
738 - gh-issue-100342: Add missing ``NULL`` check for possible allocation
741 - gh-issue-64490: Argument Clinic varargs bugfixes
743   * Fix out-of-bounds error in :c:func:`!_PyArg_UnpackKeywordsWithVararg`.
746   * Do not generate ``noptargs`` when there is a vararg argument and no optional argument.
749 -----
751 - gh-issue-99240: In argument parsing, after deallocating newly allocated
758 *Release date: 2022-12-06*
761 --------
763 - gh-issue-100001: ``python -m http.server`` no longer allows terminal
767   This is done by changing the :mod:`http.server`
771 - gh-issue-87604: Avoid publishing list of active per-interpreter audit
774 - gh-issue-98433: The IDNA codec decoder used on DNS hostnames by
777   denial of service if an out-of-spec excessive length hostname involving
782 - gh-issue-98739: Update bundled libexpat to 2.5.0
784 - gh-issue-97612: Fix a shell code injection vulnerability in the
785   ``get-remote-certificate.py`` example script. The script no longer uses a
790 -----------------
792 - gh-issue-99886: Fix a crash when an object which does not have a
795 - gh-issue-99891: Fix a bug in the tokenizer that could cause infinite
799 - gh-issue-99729: Fix an issue that could cause frames to be visible to
803 - gh-issue-99578: Fix a reference bug in :func:`_imp.create_builtin()` after
804   the creation of the first sub-interpreter for modules ``builtins`` and
807 - gh-issue-99581: Fixed a bug that was causing a buffer overflow if the
808   tokenizer copies a line missing the newline caracter from a file that is
811 - gh-issue-99553: Fix bug where an :exc:`ExceptionGroup` subclass can wrap a
814 - gh-issue-99370: Fix zip path for venv created from a non-installed python
817 - gh-issue-99298: Fix an issue that could potentially cause incorrect error
820 - gh-issue-99205: Fix an issue that prevented :c:type:`PyThreadState` and
823 - gh-issue-99181: Fix failure in :keyword:`except* <except_star>` with
826 - gh-issue-99204: Fix calculation of :data:`sys._base_executable` when
832 - gh-issue-96055: Update :mod:`faulthandler` to emit an error message with
833   the proper unexpected signal number. Patch by Dong-hee Na.
835 - gh-issue-99153: Fix location of :exc:`SyntaxError` for a :keyword:`try`
838 - gh-issue-99103: Fix the error reporting positions of specialized traceback
841 - gh-issue-98852: Fix subscription of type aliases containing bare generic
843   T][int]`` and ``tuple[TypeVar, T][int]``, where ``A`` is a generic type,
844   and ``T`` is a type variable.
846 - gh-issue-98925: Lower the recursion depth for marshal on WASI to support
849 - gh-issue-98783: Fix multiple crashes in debug mode when ``str`` subclasses
852 - gh-issue-99257: Fix an issue where member descriptors (such as those for
857 - gh-issue-98374: Suppress ImportError for invalid query for help() command.
858   Patch by Dong-hee Na.
860 - gh-issue-98415: Fix detection of MAC addresses for :mod:`uuid` on certain
863 - gh-issue-92119: Print exception class name instead of its string
866 - gh-issue-96078: :func:`os.sched_yield` now release the GIL while calling
867   sched_yield(2). Patch by Dong-hee Na.
869 - gh-issue-93354: Fix an issue that could delay the specialization of
872 - gh-issue-97943: Bugfix: :func:`PyFunction_GetAnnotations` should return a
875 - gh-issue-97779: Ensure that all Python frame objects are backed by
878 - gh-issue-97591: Fixed a missing incref/decref pair in
881 - gh-issue-94526: Fix the Python path configuration used to initialized
883   UTF-8/strict to avoid encoding errors if it contains surrogate characters
887 - gh-issue-95921: Fix overly-broad source position information for chained
890 - gh-issue-96387: At Python exit, sometimes a thread holding the GIL can
897 - gh-issue-96864: Fix a possible assertion failure, fatal error, or
899   opcode tracing is enabled.
901 - gh-issue-96678: Fix undefined behaviour in C code of null pointer
904 - gh-issue-96754: Make sure that all frame objects created are created from
908 - gh-issue-95196: Disable incorrect pickling of the C implemented
911 - gh-issue-96005: On WASI :data:`~errno.ENOTCAPABLE` is now mapped to
916 - gh-issue-93696: Allow :mod:`pdb` to locate source for frozen modules in
919 - bpo-31718: Raise :exc:`ValueError` instead of :exc:`SystemError` when
923 - bpo-38031: Fix a possible assertion failure in :class:`io.FileIO` when the
927 -------
929 - gh-issue-100001: Also \ escape \s in the http.server
930   BaseHTTPRequestHandler.log_message so that it is technically possible to
932   \xHH is ambiguious as to if it is a hex replacement we put in or the
935 - gh-issue-93453: :func:`asyncio.get_event_loop` now only emits a
939 - gh-issue-51524: Fix bug when calling trace.CoverageResults with valid
942 - gh-issue-99645: Fix a bug in handling class cleanups in
947 - gh-issue-97001: Release the GIL when calling termios APIs to avoid
950 - gh-issue-99341: Fix :func:`ast.increment_lineno` to also cover
953 - gh-issue-99418: Fix bug in :func:`urllib.parse.urlparse` that causes URL
957 - gh-issue-99382: Check the number of arguments in substitution in user
961 - gh-issue-99379: Fix substitution of :class:`~typing.ParamSpec` followed by
964 - gh-issue-99344: Fix substitution of :class:`~typing.TypeVarTuple` and
967 - gh-issue-74044: Fixed bug where :func:`inspect.signature` reported
970 - gh-issue-99275: Fix ``SystemError`` in :mod:`ctypes` when exception was
973 - gh-issue-99277: Remove older version of
977 - gh-issue-99248: fix negative numbers failing in verify()
979 - gh-issue-99155: Fix :class:`statistics.NormalDist` pickle with ``0`` and
982 - gh-issue-93464: ``enum.auto()`` is now correctly activated when combined
986 - gh-issue-99134: Update the bundled copy of pip to version 22.3.1.
988 - gh-issue-83004: Clean up refleak on failed module initialisation in
991 - gh-issue-83004: Clean up refleaks on failed module initialisation in in
994 - gh-issue-83004: Clean up refleak on failed module initialisation in
997 - gh-issue-98897: Fix memory leak in :func:`math.dist` when both points
1000 - gh-issue-98706: [3.11] Applied changes from importlib_metadata `4.11.4
1002   <https://importlib-metadata.readthedocs.io/en/latest/history.html#v4-13-0>`_,
1009 - gh-issue-98793: Fix argument typechecks in :func:`!_overlapped.WSAConnect`
1012 - gh-issue-98744: Prevent crashing in :mod:`traceback` when retrieving the
1013   byte-offset for some source files that contain certain unicode characters.
1015 - gh-issue-98740: Fix internal error in the :mod:`re` module which in very
1017   containing a :ref:`conditional expression <re-conditional-expression>`
1020 - gh-issue-98703: Fix :meth:`asyncio.StreamWriter.drain` to call
1023 - gh-issue-98624: Add a mutex to unittest.mock.NonCallableMock to protect
1026 - gh-issue-89237: Fix hang on Windows in ``subprocess.wait_closed()`` in
1030 - gh-issue-98458: Fix infinite loop in unittest when a self-referencing
1031   chained exception is raised
1033 - gh-issue-97928: :meth:`tkinter.Text.count` raises now an exception for
1034   options starting with "-" instead of silently ignoring them.
1036 - gh-issue-97966: On ``uname_result``, restored expectation that ``_fields``
1039 - gh-issue-98307: A :meth:`~logging.handlers.SysLogHandler.createSocket`
1042 - gh-issue-96035: Fix bug in :func:`urllib.parse.urlparse` that causes
1044   signs, or non-ASCII digits to be incorrectly accepted.
1046 - gh-issue-98251: Allow :mod:`venv` to pass along :envvar:`PYTHON*`
1050 - gh-issue-98178: On macOS, fix a crash in :func:`syslog.syslog` in
1051   multi-threaded applications. On macOS, the libc ``syslog()`` function is
1052   not thread-safe, so :func:`syslog.syslog` no longer releases the GIL to
1055 - gh-issue-96151: Allow ``BUILTINS`` to be a valid field name for frozen
1058 - gh-issue-87730: Wrap network errors consistently in urllib FTP support, so
1059   the test suite doesn't fail when a network is available but the public
1060   internet is not reachable.
1062 - gh-issue-98086: Make sure ``patch.dict()`` can be applied on async
1065 - gh-issue-90985: Earlier in 3.11 we deprecated
1069 - gh-issue-97837: Change deprecate warning message in :mod:`unittest` from
1071   ``It is deprecated to return a value!=None``
1075   ``It is deprecated to return a value that is not None from a test case``
1077 - gh-issue-97825: Fixes :exc:`AttributeError` when
1078   :meth:`subprocess.check_output` is used with argument ``input=None`` and
1081 - gh-issue-82836: Fix :attr:`~ipaddress.IPv4Address.is_private` properties
1082   in the :mod:`ipaddress` module. Previously non-private networks
1086 - gh-issue-96827: Avoid spurious tracebacks from :mod:`asyncio` when default
1087   executor cleanup is delayed until after the event loop is closed (e.g. as
1090 - gh-issue-97592: Avoid a crash in the C version of
1091   :meth:`asyncio.Future.remove_done_callback` when an evil argument is
1094 - gh-issue-97639: Remove ``tokenize.NL`` check from :mod:`tabnanny`.
1096 - gh-issue-73588: Fix generation of the default name of
1102 - gh-issue-97005: Update bundled libexpat to 2.4.9
1104 - gh-issue-85760: Fix race condition in :mod:`asyncio` where
1109 - gh-issue-96819: Fixed check in :mod:`multiprocessing.resource_tracker`
1110   that guarantees that the length of a write to a pipe is not greater than
1113 - gh-issue-96741: Corrected type annotation for dataclass attribute
1116 - gh-issue-95987: Fix ``repr`` of ``Any`` subclasses.
1118 - gh-issue-96388: Work around missing socket functions in
1121 - gh-issue-96073: In :mod:`inspect`, fix overeager replacement of
1124 - gh-issue-96192: Fix handling of ``bytes`` :term:`path-like objects
1125   <path-like object>` in :func:`os.ismount()`.
1127 - gh-issue-96052: Fix handling compiler warnings (SyntaxWarning and
1133 - gh-issue-88863: To avoid apparent memory leaks when
1138 - gh-issue-91212: Fixed flickering of the turtle window when the tracer is
1139   turned off. Patch by Shin-myoung-serp.
1141 - gh-issue-88050: Fix :mod:`asyncio` subprocess transport to kill process
1142   cleanly when process is blocked and avoid ``RuntimeError`` when loop is
1145 - gh-issue-93858: Prevent error when activating venv in nested fish
1148 - gh-issue-91078: :meth:`TarFile.next` now returns ``None`` when called on
1151 - bpo-47220: Document the optional *callback* parameter of
1154 - bpo-46364: Restrict use of sockets instead of pipes for stdin of
1157 - bpo-38523: :func:`shutil.copytree` now applies the
1160 - bpo-36267: Fix IndexError in :class:`argparse.ArgumentParser` when a
1161   ``store_true`` action is given an explicit argument.
1164 -------------
1166 - gh-issue-92892: Document that calling variadic functions with ctypes
1169 - gh-issue-85525: Remove extra row
1171 - gh-issue-95588: Clarified the conflicting advice given in the :mod:`ast`
1174   process. The latter statement is true and is deemed unfixable without a
1176   no longer claim that ``literal_eval`` is safe.
1178 - bpo-41825: Restructured the documentation for the :func:`os.wait*
1184 -----
1186 - gh-issue-99892: Skip test_normalization() of test_unicodedata if it fails
1190 - gh-issue-99934: Correct test_marsh on (32 bit) x86: test_deterministic
1193 - gh-issue-99659: Optional big memory tests in ``test_sqlite3`` now catch
1197 - gh-issue-98713: Fix a bug in the :mod:`typing` tests where a test relying
1198   on CPython-specific implementation details was not decorated with
1201 - gh-issue-87390: Add tests for star-unpacking with PEP 646, and some other
1204 - gh-issue-96853: Added explicit coverage of ``Py_Initialize`` (and hence
1208 - bpo-34272: Some C API tests were moved into the new Lib/test/test_capi/
1212 -----
1214 - gh-issue-99086: Fix ``-Wimplicit-int``, ``-Wstrict-prototypes``, and
1215   ``-Wimplicit-function-declaration`` compiler warnings in
1218 - gh-issue-99337: Fix a compilation issue with GCC 12 on macOS.
1220 - gh-issue-99086: Fix ``-Wimplicit-int`` compiler warning in
1223 - gh-issue-98872: Fix a possible fd leak in ``Programs/_freeze_module.c``
1226 - gh-issue-99016: Fix build with ``PYTHON_FOR_REGEN=python3.8``.
1228 - gh-issue-97731: Specify the full path to the source location for ``make
1229   docclean`` (needed for cross-builds).
1231 - gh-issue-98707: Don't use vendored ``libmpdec`` headers if
1232   :option:`--with-system-libmpdec` is passed to :program:`configure`. Don't
1233   use vendored ``libexpat`` headers if :option:`--with-system-expat` is
1236 - gh-issue-96761: Fix the build process of clang compiler for
1237   :program:`_bootstrap_python` if LTO optimization is applied. Patch by
1238   Matthias Görgens and Dong-hee Na.
1240 - gh-issue-96883: ``wasm32-emscripten`` builds for browsers now include
1243 - gh-issue-84461: ``wasm32-emscripten`` platform no longer builds
1247 - gh-issue-94280: Updated pegen regeneration script on Windows to find and
1253 -------
1255 - gh-issue-99345: Use faster initialization functions to detect install
1258 - gh-issue-98629: Fix initialization of :data:`sys.version` and ``sys._git``
1261 - gh-issue-99442: Fix handling in :ref:`launcher` when ``argv[0]`` does not
1264 - gh-issue-98689: Update Windows builds to zlib v1.2.13.  v1.2.12 has
1265   CVE-2022-37434, but the vulnerable ``inflateGetHeader`` API is not used by
1268 - gh-issue-98790: Assumes that a missing ``DLLs`` directory means that
1271 - gh-issue-98745: Update :file:`py.exe` launcher to install 3.11 by default
1274 - gh-issue-98692: Fix the :ref:`launcher` ignoring unrecognized shebang
1277 - gh-issue-94328: Update Windows installer to use SQLite 3.39.4.
1279 - gh-issue-97728: Fix possible crashes caused by the use of uninitialized
1281   in Windows-specific modules (like ``winreg``).
1283 - gh-issue-96965: Update libffi to 3.4.3
1285 - gh-issue-94781: Fix :file:`pcbuild.proj` to clean previous instances of
1289 - bpo-40882: Fix a memory leak in
1293 -----
1295 - gh-issue-87235: On macOS ``python3 /dev/fd/9 9</path/to/script.py`` failed
1298 - gh-issue-98940: Fix ``Mac/Extras.install.py`` file filter bug.
1300 - gh-issue-94328: Update macOS installer to SQLite 3.39.4.
1303 ----
1305 - gh-issue-97527: Fix a bug in the previous bugfix that caused IDLE to not
1311 -----------
1313 - gh-issue-95853: The ``wasm_build.py`` script now pre-builds Emscripten
1314   ports, checks for broken EMSDK versions, and warns about pkg-config env
1317 - gh-issue-95853: The new tool ``Tools/wasm/wasm_builder.py`` automates
1321 - gh-issue-95731: Fix handling of module docstrings in
1325 -----
1327 - gh-issue-98680: ``PyBUF_*`` constants were marked as part of Limited API
1332 - gh-issue-98978: Fix use-after-free in ``Py_SetPythonHome(NULL)``,
1336 - gh-issue-96853: ``Py_InitializeEx`` now correctly calls ``PyConfig_Clear``
1345 *Release date: 2022-10-24*
1348 --------
1350 - gh-issue-97616: Fix multiplying a list by an integer (``list *= int``):
1351   detect the integer overflow when the new allocated length is close to the
1354 - gh-issue-97514: On Linux the :mod:`multiprocessing` module returns to
1358   <multiprocessing-start-methods>` is affected.
1362   <https://man7.org/linux/man-pages/man7/network_namespaces.7.html>`_ (often
1368   This prevents Linux `CVE-2022-42919
1369   <https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-42919>`_.
1372 -----------------
1374 - gh-issue-97002: Fix an issue where several frame objects could be backed
1378 - gh-issue-97752: Fix possible data corruption or crashes when accessing the
1379   ``f_back`` member of newly-created generator or coroutine frames.
1381 - gh-issue-96975: Fix a crash occurring when :c:func:`PyEval_GetFrame` is
1382   called while the topmost Python frame is in a partially-initialized state.
1384 - gh-issue-96848: Fix command line parsing: reject :option:`-X
1385   int_max_str_digits <-X>` option with no value (invalid) when the
1386   :envvar:`PYTHONINTMAXSTRDIGITS` environment variable is set to a valid
1389 - gh-issue-96821: Fix undefined behaviour in ``_testcapimodule.c``.
1391 - gh-issue-95778: When :exc:`ValueError` is raised if an integer is larger
1395 - gh-issue-96587: Correctly raise ``SyntaxError`` on exception groups
1398 - bpo-42316: Document some places where an assignment expression needs
1402 -------
1404 - gh-issue-98331: Update the bundled copies of pip and setuptools to
1407 - gh-issue-90985: Earlier in 3.11 we deprecated
1411 - gh-issue-97545: Make Semaphore run faster.
1413 - gh-issue-96865: fix Flag to use boundary CONFORM
1415   This restores previous Flag behavior of allowing flags with non-sequential
1420   Skip.TWO | Skip.EIGHT -> <Skip.TWO|EIGHT: 10>
1422 - gh-issue-90155: Fix broken :class:`asyncio.Semaphore` when acquire is
1426 -------------
1428 - gh-issue-97741: Fix ``!`` in c domain ref target syntax via a ``conf.py``
1431 - gh-issue-93031: Update tutorial introduction output to use 3.10+
1435 -----
1437 - gh-issue-95027: On Windows, when the Python test suite is run with the
1438   ``-jN`` option, the ANSI code page is now used as the encoding for the
1439   stdout temporary file, rather than using UTF-8 which can lead to decoding
1443 -----
1445 - gh-issue-96729: Ensure that Windows releases built with
1450 -------
1452 - gh-issue-98360: Fixes :mod:`multiprocessing` spawning child processes on
1457 - gh-issue-98414: Fix :file:`py.exe` launcher handling of ``-V:<company>/``
1461 - gh-issue-90989: Clarify some text in the Windows installer.
1464 -----
1466 - gh-issue-97897: The macOS 13 SDK includes support for the ``mkfifoat`` and
1469   cpython is built with the macOS 13 SDK but run on an earlier version of
1471   system calls ("weaklinking") as is done for other newer syscalls on macOS.
1477 *Release date: 2022-09-11*
1480 --------
1482 - gh-issue-95778: Converting between :class:`int` and :class:`str` in bases
1485   string form is above a limit to avoid potential denial of service attacks
1486   due to the algorithmic complexity. This is a mitigation for
1487   `CVE-2020-10735
1488   <https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10735>`_.
1493   default limit is 4300 digits in string form.
1500 -----------------
1502 - gh-issue-96678: Fix case of undefined behavior in ceval.c
1504 - gh-issue-96641: Do not expose ``KeyWrapper`` in :mod:`_functools`.
1506 - gh-issue-96636: Ensure that tracing, ``sys.setrace()``, is turned on
1507   immediately. In pre-release versions of 3.11, some tracing events might
1511 - gh-issue-96572: Fix use after free in trace refs build mode. Patch by
1514 - gh-issue-96611: When loading a file with invalid UTF-8 inside a multi-line
1515   string, a correct SyntaxError is emitted.
1517 - gh-issue-96612: Make sure that incomplete frames do not show up in
1520 - gh-issue-96569: Remove two cases of undefined behavior, by adding NULL
1523 - gh-issue-96582: Fix possible ``NULL`` pointer dereference in
1526 - gh-issue-96352: Fix :exc:`AttributeError` missing ``name`` and ``obj``
1529 - gh-issue-96268: Loading a file with invalid UTF-8 will now report the
1532 - gh-issue-96187: Fixed a bug that caused ``_PyCode_GetExtra`` to return
1535 - gh-issue-96071: Fix a deadlock in :c:func:`PyGILState_Ensure` when
1538 - gh-issue-96046: :c:func:`PyType_Ready` now initializes ``ht_cached_keys``
1543 - gh-issue-95818: Skip over incomplete frames in
1546 - gh-issue-95876: Fix format string in
1551 - gh-issue-95605: Fix misleading contents of error message when converting
1552   an all-whitespace string to :class:`float`.
1554 - gh-issue-94996: :func:`ast.parse` will no longer parse function
1555   definitions with positional-only params when passed ``feature_version``
1559 -------
1561 - gh-issue-96700: Fix incorrect error message in the :mod:`io` module.
1563 - gh-issue-96652: Fix the faulthandler implementation of
1565   function is not available: don't call the previous signal handler if it's
1568 - gh-issue-68163: Correct conversion of :class:`numbers.Rational`'s to
1571 - gh-issue-96385: Fix ``TypeVarTuple.__typing_prepare_subst__``.
1575 - gh-issue-90467: Fix :class:`asyncio.streams.StreamReaderProtocol` to keep
1578 - gh-issue-96159: Fix a performance regression in logging
1582 - gh-issue-96175: Fix unused ``localName`` parameter in the ``Attr`` class
1585 - gh-issue-96125: Fix incorrect condition that causes
1588 - gh-issue-95463: Remove an incompatible change from :issue:`28080` that
1592 - gh-issue-95899: Fix :class:`asyncio.Runner` to call
1597 - gh-issue-95736: Fix :class:`unittest.IsolatedAsyncioTestCase` to set event
1600 - gh-issue-95704: When a task catches :exc:`asyncio.CancelledError` and
1604 - gh-issue-95231: Fail gracefully if :data:`~errno.EPERM` or
1605   :data:`~errno.ENOSYS` is raised when loading :mod:`crypt` methods. This
1609 - gh-issue-74116: Allow :meth:`asyncio.StreamWriter.drain` to be awaited
1612 - gh-issue-92986: Fix :func:`ast.unparse` when ``ImportFrom.level`` is None
1615 -------------
1617 - gh-issue-96098: Improve discoverability of the higher level
1621 - gh-issue-95957: What's New 3.11 now has instructions for how to provide
1625 -----
1627 - gh-issue-95243: Mitigate the inherent race condition from using
1632 -----
1634 - gh-issue-94682: Build and test with OpenSSL 1.1.1q
1637 -------
1639 - gh-issue-96577: Fixes a potential buffer overrun in :mod:`msilib`.
1641 - gh-issue-96559: Fixes the Windows launcher not using the compatible
1649 *Release date: 2022-08-05*
1652 -----------------
1654 - gh-issue-95150: Update code object hashing and equality to consider all
1656   non-identical code objects could be "deduplicated" during compilation.
1658 - gh-issue-95355: ``_PyPegen_Parser_New`` now properly detects token memory
1661 - gh-issue-90081: Run Python code in tracer/profiler function at full speed.
1664 - gh-issue-95324: Emit a warning in debug mode if an object does not call
1667 - gh-issue-95185: Prevented crashes in the AST constructor when compiling
1669   :exc:`RecursionError` is now raised instead. Patch by Pablo Galindo
1671 - gh-issue-93351: :class:`ast.AST` node positions are now validated when
1675 - gh-issue-94938: Fix error detection in some builtin functions when keyword
1676   argument name is an instance of a str subclass with overloaded ``__eq__``
1681 -------
1683 - gh-issue-95609: Update bundled pip to 22.2.2.
1685 - gh-issue-95289: Fix :class:`asyncio.TaskGroup` to propagate exception when
1689 - gh-issue-95339: Update bundled pip to 22.2.1.
1691 - gh-issue-95045: Fix GC crash when deallocating ``_lsprof.Profiler`` by
1694 - gh-issue-95097: Fix :func:`asyncio.run` for :class:`asyncio.Task`
1698 - gh-issue-93899: Fix check for existence of :data:`os.EFD_CLOEXEC`,
1702 - gh-issue-95166: Fix :meth:`concurrent.futures.Executor.map` to cancel the
1703   currently waiting on future on an error - e.g. TimeoutError or
1706 - gh-issue-95109: Ensure that timeouts scheduled with
1709 - gh-issue-91810: Suppress writing an XML declaration in open files in
1713 - gh-issue-91447: Fix findtext in the xml module to only give an empty
1714   string when the text attribute is set to None.
1717 -------------
1719 - gh-issue-91207: Fix stylesheet not working in Windows CHM htmlhelp docs
1722 - gh-issue-95451: Update library documentation with :ref:`availability
1723   information <wasm-availability>` on WebAssembly platforms
1724   ``wasm32-emscripten`` and ``wasm32-wasi``.
1726 - gh-issue-95415: Use consistent syntax for platform availability. The
1730 - gh-issue-86128: Document a limitation in ThreadPoolExecutor where its exit
1731   handler is executed before any handlers in atexit.
1734 -----
1736 - gh-issue-95573: :source:`Lib/test/test_asyncio/test_ssl.py` exposed a bug
1737   in the macOS kernel where intense concurrent load on non-blocking sockets
1740   workaround buffer size used in tests on macOS is decreased to avoid
1743 - gh-issue-95280: Fix problem with ``test_ssl`` ``test_get_ciphers`` on
1746 - gh-issue-94675: Add a regression test for :mod:`re` exponentional slowdown
1750 -----
1752 - gh-issue-94801: Fix a regression in ``configure`` script that caused some
1756 - gh-issue-95145: wasm32-wasi builds no longer depend on WASIX's pthread
1759 - gh-issue-95174: Python now detects missing ``dup`` function in WASI and
1763 - gh-issue-95174: Python now skips missing :mod:`socket` functions and
1767 - gh-issue-95085: Platforms ``wasm32-unknown-emscripten`` and
1768   ``wasm32-unknown-wasi`` have been promoted to :pep:`11` tier 3 platform
1772 -------
1774 - gh-issue-95656: Enable the
1777 - gh-issue-95587: Fixes some issues where the Windows installer would
1780 - gh-issue-94399: Restores the behaviour of :ref:`launcher` for
1782   an executable matching the given command. If none is found, the usual
1783   search process is used.
1785 - gh-issue-95445: Fixes the unsuccessful removal of the HTML document
1788 - gh-issue-95359: Fix :ref:`launcher` handling of :file:`py.ini` commands
1790   reading per-user configuration file.
1792 - gh-issue-95285: Fix :ref:`launcher` handling of command lines where it is
1796 ----
1798 - gh-issue-65802: Document handling of extensions in Save As dialogs.
1800 - gh-issue-95191: Include prompts when saving Shell (interactive input and
1803 - gh-issue-95511: Fix the Shell context menu copy-with-prompts bug of
1806 - gh-issue-95471: In the Edit menu, move ``Select All`` and add a new
1809 - gh-issue-95411: Enable using IDLE's module browser with .pyw files.
1811 - gh-issue-89610: Add .pyi as a recognized extension for IDLE on macOS.
1815 -----
1817 - gh-issue-92678: Restore the 3.10 behavior for multiple inheritance of C
1820 - gh-issue-94936: Added :c:func:`PyCode_GetVarnames`,
1829 *Release date: 2022-07-25*
1832 -----------------
1834 - gh-issue-93351: :class:`ast.AST` node positions are now validated when
1838 - gh-issue-94438: Fix an issue that caused extended opcode arguments and
1844 - gh-issue-95060: Undocumented ``PyCode_Addr2Location`` function now
1845   properly returns when ``addrq`` argument is less than zero.
1847 - gh-issue-95113: Replace all ``EXTENDED_ARG_QUICK`` instructions with basic
1849   non-adaptive bytecode should be able to handle extended arguments the same
1852 - gh-issue-91409: Fix incorrect source location info caused by certain
1855 - gh-issue-94036: Fix incorrect source location info for some multi-line
1858 - gh-issue-94739: Allow jumping within, out of, and across exception
1861 - gh-issue-94949: :func:`ast.parse` will no longer parse parenthesized
1865 - gh-issue-94947: :func:`ast.parse` will no longer parse assignment
1869 - gh-issue-91256: Ensures the program name is known for help text during
1872 - gh-issue-94869: Fix the column offsets for some expressions in multi-line
1873   f-strings :mod:`ast` nodes. Patch by Pablo Galindo.
1875 - gh-issue-94822: Fix an issue where lookups of metaclass descriptors may be
1876   ignored when an identically-named attribute also exists on the class
1879 - gh-issue-91153: Fix an issue where a :class:`bytearray` item assignment
1882 - gh-issue-90699: Fix reference counting bug in :meth:`bool.__repr__`. Patch
1886 -------
1888 - gh-issue-95087: Fix IndexError in parsing invalid date in the :mod:`email`
1891 - gh-issue-95199: Upgrade bundled setuptools to 63.2.0.
1893 - gh-issue-95194: Upgrade bundled pip to 22.2.
1895 - gh-issue-95132: Fix a :mod:`sqlite3` regression where ``*args`` and
1900 - gh-issue-93157: Fix :mod:`fileinput` module didn't support ``errors``
1901   option when ``inplace`` is true.
1903 - gh-issue-95105: :meth:`wsgiref.types.InputStream.__iter__` should return
1906 - gh-issue-94857: Fix refleak in ``_io.TextIOWrapper.reconfigure``. Patch by
1909 - gh-issue-94821: Fix binding of unix socket to empty address on Linux to
1912 - gh-issue-89988: Fix memory leak in :class:`pickle.Pickler` when looking up
1915 - bpo-47025: Drop support for :class:`bytes` on :attr:`sys.path`.
1918 -----
1920 - gh-issue-95212: Make multiprocessing test case
1921   ``test_shared_memory_recreate`` parallel-safe.
1924 -----
1926 - gh-issue-94847: Fixed ``_decimal`` module build issue on GCC when
1930 - gh-issue-94841: Fix the possible performance regression of
1933 - gh-issue-94801: ``configure`` now uses custom flags like ``ZLIB_CFLAGS``
1936 - gh-issue-94773: ``deepfreeze.py`` now supports code object with frozensets
1940 -------
1942 - gh-issue-90844: Allow virtual environments to correctly launch when they
1945 - gh-issue-94772: Fix incorrect handling of shebang lines in py.exe launcher
1948 -----
1950 - gh-issue-92678: Adds unstable C-API functions
1954 - gh-issue-94930: Fix ``SystemError`` raised when
1955   :c:func:`PyArg_ParseTupleAndKeywords` is used with ``#`` in ``(...)`` but
1958 - gh-issue-94864: Fix ``PyArg_Parse*`` with deprecated format units "u" and
1961 - gh-issue-94731: Python again uses C-style casts for most casting
1963   they are enabled with e.g. ``-Wold-style-cast `` or
1964   ``-Wzero-as-null-pointer-constant`` options for ``g++``.
1970 *Release date: 2022-07-11*
1973 --------
1975 - gh-issue-87389: :mod:`http.server`: Fix an open redirection vulnerability
1979 - gh-issue-79096: LWPCookieJar and MozillaCookieJar create files with file
1980   mode 600 instead of 644 (Microsoft Windows is not affected)
1982 - gh-issue-92888: Fix ``memoryview`` use after free when accessing the
1985 - gh-issue-68966: The deprecated mailcap module now refuses to inject unsafe
1991 -----------------
1993 - gh-issue-94694: Fix an issue that could cause code with multi-line method
1995   cases (when compiling a hand-built AST) this could have resulted in a hard
1998 - gh-issue-93252: Fix an issue that caused internal frames to outlive failed
2002 - gh-issue-94215: Fix an issue where exceptions raised by line-tracing
2006 - gh-issue-92228: Disable the compiler's inline-small-exit-blocks
2011 - gh-issue-94485: Line number of a module's ``RESUME`` instruction is set to
2014 - gh-issue-94438: Account for instructions that can push NULL to the stack
2017 - gh-issue-91719: Reload ``opcode`` when raising ``unknown opcode error`` in
2021 - gh-issue-94329: Compile and run code with unpacking of extremely large
2025 - gh-issue-94360: Fixed a tokenizer crash when reading encoded files with
2026   syntax errors from ``stdin`` with non utf-8 encoded text. Patch by Pablo
2029 - gh-issue-88116: Fix an issue when reading line numbers from code objects
2033 - gh-issue-94262: Don't create frame objects for incomplete frames. Prevents
2037 - gh-issue-94192: Fix error for dictionary literals with invalid expression
2040 - gh-issue-93883: Revise the display strategy of traceback enhanced error
2044 - gh-issue-94021: Fix unreachable code warning in ``Python/specialize.c``.
2046 - gh-issue-93516: Store offset of first traceable instruction in code object
2049 - gh-issue-93516: Lazily create a table mapping bytecode offsets to line
2052 - gh-issue-89828: :class:`types.GenericAlias` no longer relays the
2056 - gh-issue-93671: Fix some exponential backtrace case happening with deeply
2059 - gh-issue-93662: Make sure that the end column offsets are correct in
2060   multi-line method calls. Previously, the end column could precede the
2063 - gh-issue-93461: :func:`importlib.invalidate_caches` now drops entries from
2068   is now ``/egg/spam``.
2070 - gh-issue-93418: Fixed an assert where an f-string has an equal sign '='
2074 - gh-issue-93382: Cache the result of :c:func:`PyCode_GetCode` function to
2077 - gh-issue-93354: Use exponential backoff for specialization counters in the
2082 - gh-issue-93021: Fix the :attr:`__text_signature__` for :meth:`__get__`
2085 - gh-issue-92930: Fixed a crash in ``_pickle.c`` from mutating collections
2088 - gh-issue-92914: Always round the allocated size for lists up to the
2091 - gh-issue-92858: Improve error message for some suites with syntax error
2094 - bpo-46142: Make ``--help`` output shorter by moving some info to the new
2095   ``--help-env`` and ``--help-xoptions`` command-line options. Also add
2096   ``--help-all`` option to print complete usage.
2099 -------
2101 - gh-issue-94736: Fix crash when deallocating an instance of a subclass of
2104 - gh-issue-94637: :meth:`SSLContext.set_default_verify_paths` now releases
2108 - gh-issue-94607: Fix subclassing complex generics with type variables in
2114 - gh-issue-93910: The ability to access the other values of an enum on an
2118 - gh-issue-93896: Fix :func:`asyncio.run` and
2122 - gh-issue-94510: Re-entrant calls to :func:`sys.setprofile` and
2126 - gh-issue-92336: Fix bug where :meth:`linecache.getline` fails on bad files
2130 - gh-issue-94398: Once a :class:`asyncio.TaskGroup` has started shutting
2135 - gh-issue-94254: Fixed types of :mod:`struct` module to be immutable. Patch
2138 - gh-issue-94207: Made :class:`_struct.Struct` GC-tracked in order to fix a
2141 - gh-issue-91742: Fix :mod:`pdb` crash after jump caused by a null pointer
2144 - gh-issue-94101: Manual instantiation of :class:`ssl.SSLSession` objects is
2148 - gh-issue-84753: :func:`inspect.iscoroutinefunction`,
2151   duck-typed function-like objects like instances of
2157 - gh-issue-94028: Fix a regression in the :mod:`sqlite3` where statement
2162 - gh-issue-93820: Pickle :class:`enum.Flag` by name.
2164 - gh-issue-93847: Fix repr of enum of generic aliases.
2166 - gh-issue-91404: Revert the :mod:`re` memory leak when a match is
2170 - gh-issue-83499: Fix double closing of file description in :mod:`tempfile`.
2172 - gh-issue-93820: Fixed a regression when :func:`copy.copy`-ing
2175 - gh-issue-79512: Fixed names and ``__module__`` value of :mod:`weakref`
2179 - gh-issue-91389: Fix an issue where :mod:`dis` utilities could report
2183 - gh-issue-93626: Set ``__future__.annotations`` to have a ``None``
2184   mandatoryRelease to indicate that it is currently 'TBD'.
2186 - gh-issue-90473: Emscripten and WASI have no home directory and cannot
2189 - gh-issue-90494: :func:`copy.copy` and :func:`copy.deepcopy` now always
2193 - gh-issue-90549: Fix a multiprocessing bug where a global named resource
2194   (such as a semaphore) could leak when a child process is spawned (as
2197 - gh-issue-93521: Fixed a case where dataclasses would try to add
2202 - gh-issue-79579: :mod:`sqlite3` now correctly detects DML queries with
2205 - gh-issue-93421: Update :data:`sqlite3.Cursor.rowcount` when a DML
2209 - gh-issue-91162: Support splitting of unpacked arbitrary-length tuple over
2212   * ``A[T, *Ts][*tuple[int, ...]]`` -> ``A[int, *tuple[int, ...]]``
2213   * ``A[*Ts, T][*tuple[int, ...]]`` -> ``A[*tuple[int, ...], int]``
2215 - gh-issue-93353: Fix the :func:`importlib.resources.as_file` context
2220 - gh-issue-83658: Make :class:`multiprocessing.Pool` raise an exception if
2221   ``maxtasksperchild`` is not ``None`` or a positive int.
2223 - gh-issue-93156: Accessing the :attr:`pathlib.PurePath.parents` sequence of
2226 - gh-issue-74696: :func:`shutil.make_archive` no longer temporarily changes
2230 - gh-issue-89973: Fix :exc:`re.error` raised in :mod:`fnmatch` if the
2232   (e.g. ``[c-a]``). Now such ranges are interpreted as empty ranges.
2234 - gh-issue-92932: Now :func:`~dis.dis` and :func:`~dis.get_instructions`
2236   Patch by Sam Gross and Dong-hee Na.
2238 - gh-issue-91577: Move imports in :class:`~multiprocessing.SharedMemory`
2242 - gh-issue-91456: Deprecate current default auto() behavior:  In 3.13 the
2246 - bpo-47231: Fixed an issue with inconsistent trailing slashes in tarfile
2249 - bpo-46755: In :class:`QueueHandler`, clear ``stack_info`` from
2252 - bpo-46197: Fix :mod:`ensurepip` environment isolation for subprocess
2255 - bpo-45924: Fix :mod:`asyncio` incorrect traceback when future's exception
2256   is raised multiple times. Patch by Kumar Aditya.
2258 - bpo-34828: :meth:`sqlite3.Connection.iterdump` now handles databases that
2262 -------------
2264 - gh-issue-94321: Document the :pep:`246` style protocol type
2267 - gh-issue-61162: Clarify :mod:`sqlite3` behavior when
2268   :ref:`sqlite3-connection-context-manager`.
2270 - gh-issue-87260: Align :mod:`sqlite3` argument specs with the actual
2273 - gh-issue-86986: The minimum Sphinx version required to build the
2274   documentation is now 3.2.
2276 - gh-issue-88831: Augmented documentation of asyncio.create_task().
2280 - bpo-47161: Document that :class:`pathlib.PurePath` does not collapse
2284 -----
2286 - gh-issue-91330: Added more tests for :mod:`dataclasses` to cover behavior
2287   with data descriptor-based fields.
2289 - gh-issue-94208: ``test_ssl`` is now checking for supported TLS version and
2292 - gh-issue-94315: Tests now check for DAC override capability instead of
2295 - gh-issue-93951: In test_bdb.StateTestCase.test_skip, avoid including
2298 - gh-issue-93957: Provide nicer error reporting from subprocesses in
2301 - gh-issue-84461: ``run_tests.py`` now handles cross compiling env vars
2304 - gh-issue-93616: ``test_modulefinder`` now creates a temporary directory in
2307 - gh-issue-93575: Fix issue with test_unicode test_raiseMemError. The test
2310   UTF-8 memory.
2312 - gh-issue-90473: WASI does not have a ``chmod(2)`` syscall.
2313   :func:`os.chmod` is now a dummy function on WASI. Skip all tests that
2316 - gh-issue-90473: Skip tests on WASI that require symlinks with absolute
2319 - gh-issue-57539: Increase calendar test coverage for
2322 - gh-issue-90473: Skip symlink tests on WASI. wasmtime uses ``openat2(2)``
2326 - gh-issue-89858: Fix ``test_embed`` for out-of-tree builds. Patch by Kumar
2329 - gh-issue-92886: Fixing tests that fail when running with optimizations
2330   (``-O``) in ``test_imaplib.py``.
2332 - gh-issue-92886: Fixing tests that fail when running with optimizations
2333   (``-O``) in ``test_zipimport.py``
2335 - bpo-47016: Create a GitHub Actions workflow for verifying bundled pip and
2339 -----
2341 - gh-issue-94404: ``makesetup`` now works around an issue with sed on macOS
2346 - gh-issue-93584: Address race condition in ``Makefile`` when installing a
2350 - gh-issue-93491: ``configure`` now detects and reports :pep:`11` support
2354 -------
2356 - gh-issue-93824: Drag and drop of files onto Python files in Windows
2359 - bpo-42658: Support native Windows case-insensitive path comparisons by
2365 -----------
2367 - gh-issue-94538: Fix Argument Clinic output to custom file destinations.
2370 - gh-issue-94430: Allow parameters named ``module`` and ``self`` with custom
2374 -----
2376 - gh-issue-93937: The following frame functions and type are now directly
2391 - gh-issue-91321: Fix the compatibility of the Python C API with C++ older
2394 - gh-issue-91731: Avoid defining the ``static_assert`` when compiling with
2395   C++ 11, where this is a keyword and redefining it can lead to undefined
2398 - gh-issue-93442: Add C++ overloads for _Py_CAST_impl() to handle 0/NULL.
2406 *Release date: 2022-06-01*
2409 -----------------
2411 - gh-issue-93359: Ensure that custom :mod:`ast` nodes without explicit end
2414 - gh-issue-93345: Fix a crash in substitution of a ``TypeVar`` in nested
2418 -----
2420 - gh-issue-69093: Fix ``Modules/Setup.stdlib.in`` rule for ``_sqlite3``
2427 *Release date: 2022-05-30*
2430 -----------------
2432 - gh-issue-84694: The ``--experimental-isolated-subinterpreters`` configure
2436 - gh-issue-91924: Fix ``__lltrace__`` debug feature if the stdout encoding
2437   is not UTF-8. Patch by Victor Stinner.
2439 - gh-issue-93061: Backward jumps after ``async for`` loops are no longer
2442 - gh-issue-93065: Fix contextvars HAMT implementation to handle iteration
2449 - gh-issue-90473: Decrease default recursion limit on WASI to address
2452 - gh-issue-92804: Fix memory leak in ``memoryview`` iterator as it was not
2455 - gh-issue-92236: Remove spurious "LINE" event when starting a generator or
2458 - gh-issue-92619: Make the compiler duplicate an exit block only if none of
2462 - gh-issue-92261: Fix hang when trying to iterate over a ``typing.Union``.
2465 -------
2467 - gh-issue-93297: Make asyncio task groups prevent child tasks from being
2470 - gh-issue-90817: The :func:`locale.resetlocale` function is deprecated and
2474 - gh-issue-92728: The :func:`re.template` function and the corresponding
2479 - gh-issue-93044: No longer convert the database argument of
2482 - gh-issue-93010: In a very special case, the email package tried to append
2486 - gh-issue-92675: Fix :func:`venv.ensure_directories` to accept
2490 - gh-issue-87901: Removed the ``encoding`` argument from :func:`os.popen`
2493 - gh-issue-91922: Fix function :func:`sqlite.connect` and the
2494   :class:`sqlite.Connection` constructor on non-UTF-8 locales. Also, they
2495   now support bytes paths non-decodable with the current FS encoding.
2497 - gh-issue-92839: Fixed crash resulting from calling bisect.insort() or
2500 - gh-issue-90473: :mod:`subprocess` now fails early on Emscripten and WASI
2503 - gh-issue-92671: Fixed :func:`ast.unparse` for empty tuples in the
2506 - gh-issue-91581: :meth:`~datetime.datetime.utcfromtimestamp` no longer
2508   fold is never 1 in UTC. In addition to being slightly faster in the common
2509   case, this also prevents some errors when the timestamp is close to
2512 - gh-issue-92550: Fix :meth:`pathlib.Path.rglob` for empty pattern.
2514 - gh-issue-92530: Fix an issue that occurred after interrupting
2517 - gh-issue-92531: The statistics.median_grouped() function now always return
2521 - gh-issue-91810: :class:`~xml.etree.ElementTree.ElementTree` method
2524   ("UTF-8" if not available) instead of locale encoding in XML declaration
2525   when ``encoding="unicode"`` is specified.
2527 - gh-issue-90622: Worker processes for
2530   method is ``"fork"`` as that can lead to deadlocks in the child processes
2533 - gh-issue-91581: Remove an unhandled error case in the C implementation of
2536   This should have no user-facing effect other than giving a possibly more
2538   10000-01-01 in the local time. Patch by Paul Ganssle.
2540 - bpo-39064: :class:`zipfile.ZipFile` now raises :exc:`zipfile.BadZipFile`
2542   central directory offset is negative.
2544 - bpo-45393: Fix the formatting for ``await x`` and ``not x`` in the
2547 - bpo-28249: Set :attr:`doctest.DocTest.lineno` to ``None`` when object does
2550 - bpo-45046: Add support of context managers in :mod:`unittest`: methods
2558 - bpo-42627: Fix incorrect parsing of Windows registry proxy settings
2561 -------------
2563 - gh-issue-86438: Clarify that :option:`-W` and :envvar:`PYTHONWARNINGS` are
2564   matched literally and case-insensitively, rather than as regular
2567 - gh-issue-92240: Added release dates for "What's New in Python 3.X" for
2570 - bpo-40838: Document that :func:`inspect.getdoc`,
2574 - bpo-38056: Overhaul the :ref:`error-handlers` documentation in
2577 - bpo-13553: Document tkinter.Tk args.
2580 -----
2582 - gh-issue-92670: Skip
2585   directory, but on AIX the trailing slash has no effect and is considered
2589 -----
2591 - gh-issue-90473: Disable pymalloc and increase stack size on
2592   ``wasm32-wasi``.
2594 - bpo-34449: Drop invalid compiler switch ``-fPIC`` for HP aCC on HP-UX.
2598 -------
2600 - gh-issue-92817: Ensures that :file:`py.exe` will prefer an active virtual
2604 - gh-issue-92984: Explicitly disable incremental linking for non-Debug
2607 - gh-issue-92841: :mod:`asyncio` no longer throws ``RuntimeError: Event loop
2608   is closed`` on interpreter exit after asynchronous socket activity. Patch
2611 - bpo-46907: Update Windows installer to use SQLite 3.38.4.
2614 -----
2616 - gh-issue-92898: Fix C++ compiler warnings when casting function arguments
2619 - gh-issue-92913: Ensures changes to
2621   :c:member:`PyConfig.module_search_paths_set` is set
2623 - gh-issue-92781: Avoid mixing declarations and code in the C API to fix the
2625   [-Werror=declaration-after-statement]. Patch by Victor Stinner.
2631 *Release date: 2022-05-06*
2634 --------
2636 - gh-issue-57684: Add the :option:`-P` command line option and the
2641 -----------------
2643 - gh-issue-89519: Chaining classmethod descriptors (introduced in bpo-19072)
2644   is deprecated. It can no longer be used to wrap other descriptors such as
2648 - gh-issue-92345: ``pymain_run_python()`` now imports ``readline`` and
2649   ``rlcompleter`` before sys.path is extended to include the current working
2650   directory of an interactive interpreter. Non-interactive interpreters are
2653 - bpo-43857: Improve the :exc:`AttributeError` message when deleting a
2656 - gh-issue-92245: Make sure that PEP 523 is respected in all cases. In
2657   3.11a7, specialization may have prevented Python-to-Python calls
2660 - gh-issue-92203: Add a closure keyword-only parameter to exec(). It can
2661   only be specified when exec-ing a code object that uses free variables.
2667 - gh-issue-91173: Disable frozen modules in debug builds. Patch by Kumar
2670 - gh-issue-92114: Improve error message when subscript a type with
2673 - gh-issue-92112: Fix crash triggered by an evil custom ``mro()`` on a
2676 - gh-issue-92063: The ``PRECALL_METHOD_DESCRIPTOR_FAST_WITH_KEYWORDS``
2680 - gh-issue-92031: Deoptimize statically allocated code objects during
2684 - gh-issue-92036: Fix a crash in subinterpreters related to the garbage
2685   collector. When a subinterpreter is deleted, untrack all objects tracked
2691 - gh-issue-92032: The interpreter can now autocomplete soft keywords, as of
2694 - gh-issue-87999: The warning emitted by the Python parser for a numeric
2698 - gh-issue-91869: Fix an issue where specialized opcodes with extended
2702 - gh-issue-91603: Speed up :class:`types.UnionType` instantiation. Based on
2705 - gh-issue-89373: If Python is built in debug mode, Python now ensures that
2709 - gh-issue-91632: Fix a minor memory leak at exit: release the memory of the
2710   :class:`generic_alias_iterator` type. Patch by Dong-hee Na.
2712 - gh-issue-81548: Octal escapes with value larger than ``0o377`` now produce
2716 - bpo-43950: Use a single compact table for line starts, ends and column
2719 - gh-issue-91102: Use Argument Clinic for :class:`EncodingMap`.  Patch by
2722 - gh-issue-91636: Fixed a crash in a garbage-collection edge-case, in which
2726 - gh-issue-91603: Speed up :func:`isinstance` and :func:`issubclass` checks
2729 - gh-issue-91625: Fixed a bug in which adaptive opcodes ignored any
2732 - gh-issue-78607: The LLTRACE special build now looks for the name
2736 - gh-issue-91576: Speed up iteration of ascii strings by 50%. Patch by Kumar
2739 - gh-issue-89279: Improve interpreter performance on Windows by inlining a
2742 - gh-issue-91502: Add a new :c:func:`_PyFrame_IsEntryFrame` API function, to
2743   check if a :c:type:`PyFrameObject` is an entry frame. Patch by Pablo
2746 - gh-issue-91266: Refactor the ``bytearray`` strip methods ``strip``,
2749 - gh-issue-91479: Replaced the ``__note__`` field of :exc:`BaseException`
2752   ``__notes__`` field is created when necessary.
2754 - gh-issue-46055: Speed up right shift of negative integers, by removing
2758 - gh-issue-91462: Make the interpreter's low-level tracing (lltrace) feature
2762 - gh-issue-89455: Fixed an uninitialized bool value in the traceback
2763   printing code path that was introduced by the initial bpo-45292 exception
2766 - gh-issue-91421: Fix a potential integer overflow in _Py_DecodeUTF8Ex.
2768 - gh-issue-91428: Add ``static const char *const _PyOpcode_OpName[256] =
2770   Python interpreter. It is now more convenient to make various forms of
2771   debugging output more human-readable by including opcode names rather than
2774 - bpo-47120: Make :opcode:`POP_JUMP_IF_TRUE`, :opcode:`POP_JUMP_IF_FALSE`,
2778 - bpo-45317: Add internal documentation explaining design of new (for 3.11)
2781 - bpo-47197: ctypes used to mishandle ``void`` return types, so that for
2785   signatures so this led to crashes. The problem is now fixed.
2787 - bpo-47120: Make opcodes :opcode:`JUMP_IF_TRUE_OR_POP` and
2790 - bpo-47177: Replace the ``f_lasti`` member of the internal
2793   of Python-layer frame objects is preserved for backward-compatibility.
2795 - bpo-46961: Integer mod/remainder operations, including the three-argument
2799 - bpo-46962: Classes and functions that unconditionally declared their
2800   docstrings ignoring the `--without-doc-strings` compilation flag no longer
2811 - bpo-46942: Use Argument Clinic for the :class:`types.MethodType`
2814 - bpo-46764: Fix wrapping bound methods with @classmethod
2816 - bpo-43464: Optimize :meth:`set.intersection` for non-set arguments.
2818 - bpo-46721: Optimize :meth:`set.issuperset` for non-set argument.
2820 - bpo-46509: Add type-specialized versions of the ``Py_DECREF()``, and use
2822   pointer-chasing at runtime where types are known at C compile time.
2824 - bpo-46045: Do not use POSIX semaphores on NetBSD
2826 - bpo-36819: Fix crashes in built-in encoders with error handlers that
2827   return position less or equal than the starting position of non-encodable
2830 - bpo-34093: ``marshal.dumps()`` uses ``FLAG_REF`` for all interned strings.
2833 - bpo-26579: Added ``object.__getstate__`` which provides the default
2842 -------
2844 - gh-issue-87901: Add the *encoding* parameter to :func:`os.popen`.
2846 - gh-issue-90997: Fix an issue where :mod:`dis` utilities may interpret
2849 - gh-issue-92332: Deprecate :class:`typing.Text` (removal of the class is
2852 - Deprecate nested classes in enum definitions becoming members -- in 3.13
2856 - gh-issue-92356: Fixed a performance regression in ctypes function calls.
2858 - gh-issue-90997: Show the actual named values stored in inline caches when
2859   ``show_caches=True`` is passed to :mod:`dis` utilities.
2861 - gh-issue-92301: Prefer ``close_range()`` to iterating over procfs for file
2864 - gh-issue-67248: Sort the miscellaneous topics in Cmd.do_help()
2866 - gh-issue-92210: Port ``socket.__init__`` to Argument Clinic. Patch by
2869 - gh-issue-80010: Add support for generalized ISO 8601 parsing to
2874 - gh-issue-92118: Fix a 3.11 regression in
2878 - gh-issue-90887: Adding ``COPYFILE_STAT``, ``COPYFILE_ACL`` and
2881 - gh-issue-91215: For @dataclass, add weakref_slot. Default is False. If
2885 - gh-issue-85984: New function os.login_tty() for Unix.
2887 - gh-issue-92128: Add :meth:`~object.__class_getitem__` to
2891 - gh-issue-92049: Forbid pickling constants ``re._constants.SUCCESS`` etc.
2894 - gh-issue-92062: :class:`inspect.Parameter` now raises :exc:`ValueError` if
2895   ``name`` is a keyword, in addition to the existing check that it is an
2898 - gh-issue-87390: Add an ``__unpacked__`` attribute to
2901 - gh-issue-88089: Add support for generic :class:`typing.NamedTuple`.
2903 - gh-issue-91996: New http.HTTPMethod enum to represent all the available
2906 - gh-issue-91984: Modified test strings in test_argparse.py to not contain
2909 - gh-issue-91952: Add ``encoding="locale"`` support to
2912 - gh-issue-91954: Add *encoding* and *errors* arguments to
2915 - bpo-47029: Always close the read end of the pipe used by
2921 - gh-issue-91928: Add `datetime.UTC` alias for `datetime.timezone.utc`.
2925 - gh-issue-68966: The :mod:`mailcap` module is now deprecated and will be
2929 - gh-issue-91401: Provide a way to disable :mod:`subprocess` use of
2930   ``vfork()`` just in case it is ever needed and document the existing
2933 - gh-issue-64783: Fix :data:`signal.NSIG` value on FreeBSD to accept signal
2937 - gh-issue-91910: Add missing f prefix to f-strings in error messages from
2940 - gh-issue-91860: Add :func:`typing.dataclass_transform`, implementing
2943 - gh-issue-91832: Add ``required`` attribute to :class:`argparse.Action`
2946 - gh-issue-91827: In the :mod:`tkinter` module add method
2950 - gh-issue-84461: Add :option:`--enable-wasm-pthreads` to enable pthreads
2954 - gh-issue-91821: Fix unstable ``test_from_tuple`` test in
2957 - gh-issue-91217: Deprecate the xdrlib module.
2959 - gh-issue-91217: Deprecate the uu module.
2961 - gh-issue-91760: More strict rules will be applied for numerical group
2963   warning is emitted for group references and group names which will be
2966 - gh-issue-84461: Add provisional :data:`sys._emscripten_info` named tuple
2967   with build-time and run-time information about Emscripten platform.
2969 - gh-issue-90623: :func:`signal.raise_signal` and :func:`os.kill` now check
2972 - gh-issue-91734: Fix OSS audio support on Solaris.
2974 - gh-issue-90633: Include the passed value in the exception thrown by
2977 - gh-issue-91700: Compilation of regular expression containing a conditional
2982 - gh-issue-91231: Add an optional keyword *shutdown_timeout* parameter to
2986 - gh-issue-91621: Fix :func:`typing.get_type_hints` for
2989 - gh-issue-90568: Parsing ``\N`` escapes of Unicode Named Character
2993 - gh-issue-91670: Remove deprecated ``SO`` config variable in
2996 - gh-issue-91217: Deprecate the telnetlib module.
2998 - gh-issue-91217: Deprecate the sunau module.
3000 - gh-issue-91217: Deprecate the spwd module.
3002 - gh-issue-91217: Deprecate the sndhdr module, as well as inline needed
3005 - gh-issue-91616: :mod:`re` module, fix :meth:`~re.Pattern.fullmatch`
3008 - gh-issue-91217: Deprecate the 'pipes' module.
3010 - gh-issue-91217: Deprecate the ossaudiodev module.
3012 - bpo-47256: :mod:`re` module, limit the maximum capturing group to
3013   1,073,741,823 in 64-bit build, this increases the depth of backtracking.
3015 - gh-issue-91217: Deprecate the nis module.
3017 - gh-issue-91595: Fix the comparison of character and integer inside
3020 - gh-issue-74166: Add option to raise all errors from
3025 - gh-issue-91487: Optimize asyncio UDP speed, over 100 times faster when
3028 - gh-issue-91575: Update case-insensitive matching in the :mod:`re` module
3031 - gh-issue-90622: In ``concurrent.futures.process.ProcessPoolExecutor``
3033   ``max_tasks_per_child`` feature is used as the mix of threads+fork can
3037 - gh-issue-89022: In :mod:`sqlite3`, ``SQLITE_MISUSE`` result codes are now
3042 - gh-issue-91526: Stop calling ``os.device_encoding(file.fileno())`` in
3046 - gh-issue-88116: Change the frame-related functions in the :mod:`inspect`
3047   module to return a regular object (that is backwards compatible with the
3048   old tuple-like interface) that include the extended :pep:`657` position
3054 - gh-issue-69093: Add indexing and slicing support to :class:`sqlite3.Blob`.
3057 - gh-issue-69093: Add :term:`context manager` support to
3060 - gh-issue-91217: Deprecate nntplib.
3062 - gh-issue-91217: Deprecate msilib.
3064 - gh-issue-91404: Improve the performance of :mod:`re` matching by using
3068 - gh-issue-91217: Deprecate the imghdr module.
3070 - gh-issue-91217: Deprecate the crypt module.
3072 - gh-issue-91276: Make space for longer opcodes in :mod:`dis` output.
3074 - bpo-47000: Make :class:`TextIOWrapper` uses locale encoding when
3075   ``encoding="locale"`` is specified even in UTF-8 mode.
3077 - gh-issue-91230: :func:`warnings.catch_warnings` now accepts arguments for
3081 - gh-issue-91217: Deprecate the chunk module.
3083 - Add the ``TCP_CONNECTION_INFO`` option (available on macOS) to
3086 - bpo-47260: Fix ``os.closerange()`` potentially being a no-op in a Linux
3089 - bpo-47087: Implement ``typing.Required`` and ``typing.NotRequired``
3092 - bpo-47061: Deprecate cgi and cgitb.
3094 - bpo-47061: Deprecate audioop.
3096 - bpo-47000: Add :func:`locale.getencoding` to get the current locale
3097   encoding. It is similar to ``locale.getpreferredencoding(False)`` but
3098   ignores the :ref:`Python UTF-8 Mode <utf8-mode>`.
3100 - bpo-42012: Add :mod:`wsgiref.types`, containing WSGI-specific types for
3103 - bpo-47227: Suppress expression chaining for more :mod:`re` parsing errors.
3105 - bpo-47211: Remove undocumented and never working function
3109 - bpo-47135: :meth:`decimal.localcontext` now accepts context attributes via
3112 - bpo-43323: Fix errors in the :mod:`email` module if the charset itself
3115 - bpo-46841: Disassembly of quickened code.
3117 - bpo-46681: Forward gzip.compress() compresslevel to zlib.
3119 - bpo-45100: Add :func:`typing.get_overloads` and
3122 - bpo-44807: :class:`typing.Protocol` no longer silently replaces
3126 - bpo-46787: Fix :class:`concurrent.futures.ProcessPoolExecutor` exception
3129 - bpo-46720: Add support for path-like objects to
3131   Unix-like systems. Patch by Géry Ogam.
3133 - bpo-46696: Add ``SO_INCOMING_CPU`` constant to :mod:`socket`.
3135 - bpo-46053: Fix OSS audio support on NetBSD.
3137 - bpo-45639: ``image/avif`` and ``image/webp`` were added to
3140 - bpo-46285: Add command-line option ``-p``/``--protocol`` to module
3141   :mod:`http.server` which specifies the HTTP version to which the server is
3143   command-line interface of module :mod:`http.server`). Patch by Géry Ogam.
3145 - bpo-44791: Accept ellipsis as the last argument of
3148 - bpo-46547: Remove variables leaking into ``pydoc.Helper`` class namespace.
3150 - bpo-46415: Fix ipaddress.ip_{address,interface,network} raising TypeError
3153 - bpo-46075: ``CookieJar`` with ``DefaultCookiePolicy`` now can process
3155   Set-Cookie header.
3157 - bpo-45995: Add a "z" option to the string formatting specification that
3158   coerces negative zero floating-point values to positive zero after
3161 - bpo-26175: Fully implement the :class:`io.BufferedIOBase` or
3164   correctly with higher-level layers (like compression modules). Patch by
3167 - bpo-45138: Fix a regression in the :mod:`sqlite3` trace callback where
3172 - bpo-44863: Allow :class:`~typing.TypedDict` subclasses to also include
3175   user-defined generic but with ``TypedDict`` semantics.
3177 - bpo-44587: Fix BooleanOptionalAction to not automatically add a default
3178   string.  If a default string is desired, use a formatter to add it.
3180 - bpo-43827: All positional-or-keyword parameters to ``ABCMeta.__new__`` are
3181   now positional-only to avoid conflicts with keyword arguments to be passed
3184 - bpo-43218: Prevent creation of a venv whose path contains the PATH
3188 - bpo-38435: Add a ``process_group`` parameter to :class:`subprocess.Popen`
3191 - bpo-42066: Fix cookies getting sorted in :func:`CookieJar.__iter__` which
3192   is an extra behavior and not mentioned in RFC 2965 or Netscape cookie
3194   ``Set-Cookie`` header. Patch by Iman Kermani.
3196 - bpo-40617: Add :meth:`~sqlite3.Connection.create_window_function` to
3200 - bpo-40676: Convert :mod:`csv` to use Argument Clinic for
3204 - bpo-39716: Raise an ArgumentError when the same subparser name is added
3205   twice to an `argparse.ArgumentParser`.  This is consistent with the
3206   (default) behavior when the same option string is added twice to an
3209 - bpo-36073: Raise :exc:`~sqlite3.ProgrammingError` instead of segfaulting
3213 - bpo-34975: Adds a ``start_tls()`` method to
3217 - bpo-22276: :class:`~pathlib.Path` methods :meth:`~pathlib.Path.glob` and
3222 - bpo-24905: Add :meth:`~sqlite3.Connection.blobopen` to
3227 -------------
3229 - gh-issue-91888: Add a new `gh` role to the documentation to link to GitHub
3232 - gh-issue-91783: Document security issues concerning the use of the
3235 - gh-issue-91547: Remove "Undocumented modules" page.
3237 - gh-issue-91298: In ``importlib.resources.abc``, refined the documentation
3241 - bpo-44347: Clarify the meaning of *dirs_exist_ok*, a kwarg of
3244 - bpo-36329: Remove 'make -C Doc serve' in favour of 'make -C Doc htmlview'
3246 - bpo-47189: Add a What's New in Python 3.11 entry for the Faster CPython
3249 - bpo-38668: Update the introduction to documentation for :mod:`os.path` to
3253 - bpo-47115: The documentation now lists which members of C structs are part
3256 - bpo-46962: All docstrings in code snippets are now wrapped into
3259   <https://www.python.org/dev/peps/pep-0007/#documentation-strings>`_. Patch
3262 - bpo-26792: Improve the docstrings of :func:`runpy.run_module` and
3266 -----
3268 - gh-issue-92169: Use ``warnings_helper.import_deprecated()`` to import
3271 - gh-issue-84461: When multiprocessing is enabled, libregrtest can now use a
3272   Python executable other than :code:`sys.executable` via the ``--python``
3275 - gh-issue-91904: Fix initialization of
3277   tests on non-UTF-8 locale.
3279 - gh-issue-91752: Added @requires_zlib to
3282 - gh-issue-91607: Fix ``test_concurrent_futures`` to test the correct
3286 - bpo-40280: Threading tests are now skipped on WASM targets without pthread
3289 - bpo-47109: Test for :mod:`ctypes.macholib.dyld`,
3291   brought from manual pre-:mod:`unittest` times to :mod:`ctypes.test`
3294 - bpo-29890: Add tests for :class:`ipaddress.IPv4Interface` and
3299 -----
3301 - gh-issue-89452: gdbm-compat is now preferred over ndbm if both are
3305 - gh-issue-91731: Python is now built with ``-std=c11`` compiler option,
3306   rather than ``-std=c99``. Patch by Victor Stinner.
3308 - bpo-47152: Add script and make target for generating ``sre_constants.h``.
3310 - bpo-47103: Windows ``PGInstrument`` builds now copy a required DLL into
3315 -------
3317 - bpo-46907: Update Windows installer to use SQLite 3.38.3.
3319 - bpo-47239: Fixed --list and --list-paths output for :ref:`launcher` when
3322 - bpo-46907: Update Windows installer to use SQLite 3.38.2.
3324 - bpo-46785: Fix race condition between :func:`os.stat` and unlinking a file
3328 - bpo-40859: Update Windows build to use xz-5.2.5
3331 -----
3333 - bpo-46907: Update macOS installer to SQLite 3.38.4.
3336 -----------
3338 - gh-issue-91583: Fix regression in the code generated by Argument Clinic
3341 - gh-issue-91575: Add script ``Tools/scripts/generate_re_casefix.py`` and
3342   the make target ``regen-re`` for generating additional data for
3343   case-insensitive matching according to the current Unicode version.
3345 - gh-issue-91551: Remove the ancient Pynche color editor.  It has moved to
3349 -----
3351 - gh-issue-88279: Deprecate the C functions: :c:func:`PySys_SetArgv`,
3355 - gh-issue-92154: Added the :c:func:`PyCode_GetCode` function. This function
3359 - gh-issue-92173: Fix the ``closure`` argument to
3362 - gh-issue-91320: Fix C++ compiler warnings about "old-style cast" (``g++
3363   -Wold-style-cast``) in the Python C API. Use C++ ``reinterpret_cast<>``
3364   and ``static_cast<>`` casts when the Python C API is used in C++. Patch by
3367 - gh-issue-80527: Mark functions as deprecated by :pep:`623`:
3372 - gh-issue-91768: :c:func:`Py_REFCNT`, :c:func:`Py_TYPE`, :c:func:`Py_SIZE`
3373   and :c:func:`Py_IS_TYPE` functions argument type is now ``PyObject*``,
3376 - gh-issue-91020: Add ``PyBytes_Type.tp_alloc`` to initialize
3379 - bpo-40421: Add ``PyFrame_GetLasti`` C-API function to access frame
3382 - bpo-35134: Remove the ``Include/code.h`` header file. C extensions should
3385 - bpo-47169: :c:func:`PyOS_CheckStack` is now exported in the Stable ABI on
3388 - bpo-47169: :c:func:`PyThread_get_thread_native_id` is excluded from the
3391 - bpo-46343: Added :c:func:`PyErr_GetHandledException` and
3401 *Release date: 2022-04-05*
3404 -----------------
3406 - bpo-47212: Raise :exc:`IndentationError` instead of :exc:`SyntaxError` for
3408   locations for an un-parenthesized generator used as arguments. Patch by
3411 - bpo-47186: Replace :opcode:`JUMP_IF_NOT_EG_MATCH` by
3414 - bpo-47176: Emscripten builds cannot handle signals in the usual way due to
3421 - bpo-47186: Replace :opcode:`JUMP_IF_NOT_EXC_MATCH` by
3424 - bpo-47120: Replace the absolute jump opcode :opcode:`JUMP_NO_INTERRUPT` by
3427 - bpo-46841: Avoid unnecessary allocations when comparing code objects.
3429 - bpo-47182: Fix a crash when using a named unicode character like
3431   second time.
3433 - bpo-47162: WebAssembly cannot deal with bad function pointer casts
3438 - bpo-46775: Some Windows system error codes(>= 10000) are now mapped into
3440   Dong-hee Na.
3442 - bpo-47129: Improve error messages in f-string syntax errors concerning
3445 - bpo-47117: Fix a crash if we fail to decode characters in interactive mode
3448 - bpo-47127: Speed up calls to c functions with keyword arguments by 25%
3451 - bpo-47120: Replaced :opcode:`JUMP_ABSOLUTE` by the relative jump
3454 - bpo-42197: :c:func:`PyFrame_FastToLocalsWithError` and
3459 - bpo-47070: Improve performance of ``array_inplace_repeat`` by reducing the
3464 - bpo-47053: Reduce de-optimization in the specialized
3467 - bpo-47045: Remove the ``f_state`` field from the _PyInterpreterFrame
3472 - bpo-46968: Check for the existence of the "sys/auxv.h" header in
3476 - bpo-46329: Use low bit of ``LOAD_GLOBAL`` to indicate whether to push a
3479 - bpo-46841: Quicken bytecode in-place by storing it as part of the
3482 - bpo-47012: Speed up iteration of :class:`bytes` and :class:`bytearray` by
3485 - bpo-47009: Improved the performance of :meth:`list.append()` and list
3486   comprehensions by optimizing for the common case, where no resize is
3489 - bpo-47005: Improve performance of ``bytearray_repeat`` and
3492 - bpo-46829: Deprecate passing a message into :meth:`asyncio.Future.cancel`
3495 - bpo-46993: Speed up :class:`bytearray` creation from :class:`list` and
3498 - bpo-39829: Removed the ``__len__()`` call when initializing a list and
3501 - bpo-46944: Speed up throwing exception in generator with
3504 - bpo-46841: Modify :opcode:`STORE_SUBSCR` to use an inline cache entry
3507 - bpo-46841: Use inline caching for :opcode:`PRECALL` and :opcode:`CALL`,
3508   and remove the internal machinery for managing the (now unused) non-inline
3511 - bpo-46881: Statically allocate and initialize the latin1 characters.
3513 - bpo-46838: Improve syntax errors for incorrect function definitions. Patch
3516 - bpo-43721: Fix docstrings of :attr:`~property.getter`,
3520 - bpo-43224: Make grammar changes required for PEP 646.
3523 -------
3525 - bpo-47208: Allow vendors to override :const:`CTYPES_MAX_ARGCOUNT`.
3527 - bpo-23689: :mod:`re` module: fix memory leak when a match is terminated by
3530 - bpo-47167: Allow overriding a future compliance check in
3533 - bpo-47151: When subprocess tries to use vfork, it now falls back to fork
3537 - bpo-47152: Convert the :mod:`re` module into a package. Deprecate modules
3540 - bpo-4833: Add :meth:`ZipFile.mkdir`
3542 - bpo-27929: Fix :meth:`asyncio.loop.sock_connect` to only resolve names for
3547 - bpo-14265: Adds the fully qualified test name to unittest output
3549 - bpo-47061: Deprecate the aifc module.
3551 - bpo-39622: Handle Ctrl+C in asyncio programs to interrupt the main task.
3553 - bpo-47101: :const:`hashlib.algorithms_available` now lists only algorithms
3558 - bpo-47099: All :exc:`URLError` exception messages raised in
3564 - bpo-47099: Exception chaining is changed from
3568 - bpo-47095: :mod:`hashlib`'s internal ``_blake2`` module now prefers
3572 - bpo-47098: The Keccak Code Package for :mod:`hashlib`'s internal ``_sha3``
3573   module has been replaced with tiny_sha3. The module is used as fallback
3574   when Python is built without OpenSSL.
3576 - bpo-47088: Implement :data:`typing.LiteralString`, part of :pep:`675`.
3579 - bpo-42885: Optimize :func:`re.search`, :func:`re.split`,
3583 - bpo-23691: Protect the :func:`re.finditer` iterator from re-entering.
3585 - bpo-47067: Optimize calling ``GenericAlias`` objects by using :pep:`590`
3589 - bpo-28080: Add the *metadata_encoding* parameter in the
3590   :class:`zipfile.ZipFile` constructor and the ``--metadata-encoding``
3592   non-standard codecs to encode the filenames within the archive.
3594 - bpo-47000: Make :func:`io.text_encoding` returns "utf-8" when UTF-8 mode
3595   is enabled.
3597 - bpo-42369: Fix thread safety of :meth:`zipfile._SharedFile.tell` to avoid
3598   a "zipfile.BadZipFile: Bad CRC-32 for file" exception when reading a
3601 - bpo-38256: Fix :func:`binascii.crc32` when it is compiled to use zlib'c
3611   implementation for :func:`binascii.crc32` for a 2-3x speedup.
3613   That the stdlib has a crc32 API in two modules is a known historical
3616 - bpo-47066: Global inline flags (e.g. ``(?i)``) can now only be used at the
3620 - bpo-39394: A warning about inline flags not at the start of the regular
3623 - bpo-433030: Add support of atomic grouping (``(?>...)``) and possessive
3627 - bpo-47062: Implement :class:`asyncio.Runner` context manager.
3629 - bpo-46382: :func:`~dataclasses.dataclass` ``slots=True`` now correctly
3632 - bpo-47057: Use FASTCALL convention for ``FutureIter.throw()``
3634 - bpo-47061: Deprecate the various modules listed by :pep:`594`:
3640 - bpo-34790: Remove passing coroutine objects to :func:`asyncio.wait`.
3642 - bpo-47039: Normalize ``repr()`` of asyncio future and task objects.
3644 - bpo-2604: Fix bug where doctests using globals would fail when run
3647 - bpo-45150: Add :func:`hashlib.file_digest` helper for efficient hashing of
3650 - bpo-34861: Made cumtime the default sorting key for cProfile
3652 - bpo-45997: Fix :class:`asyncio.Semaphore` re-aquiring FIFO order.
3654 - bpo-47022: The :mod:`asynchat`, :mod:`asyncore` and  :mod:`smtpd` modules
3659 - bpo-43253: Fix a crash when closing transports where the underlying socket
3660   handle is already invalid on the Proactor event loop.
3662 - bpo-40280: :func:`select.select` now passes ``NULL`` to ``select`` for
3665 - bpo-47004: Apply bugfixes from importlib_metadata 4.11.3, including bugfix
3669 - bpo-46998: Allow subclassing of :class:`typing.Any`. Patch by Shantanu
3672 - bpo-46995: Deprecate missing :meth:`asyncio.Task.set_name` for third-party
3675 - bpo-46994: Accept explicit contextvars.Context in
3678 - bpo-46981: ``typing.get_args(typing.Tuple[()])`` now returns ``()``
3681 - bpo-46968: Add ``os.sysconf_names['SC_MINSIGSTKSZ']``.
3683 - bpo-46985: Upgrade pip wheel bundled with ensurepip (pip 22.0.4)
3685 - bpo-46968: :mod:`faulthandler`: On Linux 5.14 and newer, dynamically
3691 - bpo-46917: The :data:`math.nan` value is now always available. Patch by
3694 - bpo-46955: Expose :class:`asyncio.base_events.Server` as
3697 - bpo-23325: The :mod:`signal` module no longer assumes that
3701 - bpo-46932: Update bundled libexpat to 2.4.7
3703 - bpo-46933: The :mod:`pwd` module is now optional.
3704   :func:`os.path.expanduser` returns the path when the :mod:`pwd` module is
3707 - bpo-40059: :pep:`680`, the :mod:`tomllib` module. Adds support for parsing
3710 - bpo-464471: :func:`asyncio.timeout` and :func:`asyncio.timeout_at` context
3713 - bpo-46805: Added raw datagram socket functions for asyncio:
3718 - bpo-46644: No longer require valid typeforms to be callable. This allows
3722 - bpo-46581: Brings :class:`ParamSpec` propagation for :class:`GenericAlias`
3725 - bpo-45413: Define *posix_venv* and *nt_venv* :ref:`sysconfig installation
3729   pre-existing *posix_prefix* and *nt* install schemes. The :mod:`venv`
3733   in a way that is not compatible with the install scheme used in virtual
3740 - bpo-43224: Implement support for PEP 646 in typing.py.
3742 - bpo-43224: Allow unpacking types.GenericAlias objects, e.g. ``*tuple[int,
3745 - bpo-46557: Warnings captured by the logging module are now logged without
3749 - bpo-41370: :func:`typing.get_type_hints` now supports evaluating strings
3751   <types-genericalias>`.
3753 - bpo-46607: Add :exc:`DeprecationWarning` to :class:`LegacyInterpolation`,
3758 - bpo-26120: :mod:`pydoc` now excludes __future__ imports from the module's
3761 - bpo-46480: Add :func:`typing.assert_type`. Patch by Jelle Zijlstra.
3763 - bpo-46421: Fix a unittest issue where if the command was invoked as
3764   ``python -m unittest`` and the filename(s) began with a dot (.), a
3765   ``ValueError`` is returned.
3767 - bpo-46245: Add optional parameter *dir_fd* in :func:`shutil.rmtree`.
3769 - bpo-22859: :meth:`~unittest.TestProgram.usageExit` is marked deprecated,
3772 - bpo-46170: Improve the error message when you try to subclass an instance
3775 - bpo-40296: Fix supporting generic aliases in :mod:`pydoc`.
3777 - bpo-20392: Fix inconsistency with uppercase file extensions in
3780 - bpo-46030: Add ``LOCAL_CREDS``, ``LOCAL_CREDS_PERSISTENT`` and
3783 - bpo-44439: Fix ``.write()`` method of a member file in ``ZipFile``, when
3784   the input data is an object that supports the buffer protocol, the file
3787 - bpo-45171: Fix handling of the ``stacklevel`` argument to logging
3788   functions in the :mod:`logging` module so that it is consistent across all
3792 - bpo-24959: Fix bug where :mod:`unittest` sometimes drops frames from
3795 - bpo-44859: Raise more accurate and :pep:`249` compatible exceptions in
3807 - bpo-44493: Add missing terminated NUL in sockaddr_un's length
3809   This was potentially observable when using non-abstract AF_UNIX datagram
3810   sockets to processes written in another programming language.
3812 - bpo-41930: Add :meth:`~sqlite3.Connection.serialize` and
3816 - bpo-33178: Added :class:`ctypes.BigEndianUnion` and
3820 - bpo-43352: Add an Barrier object in synchronization primitives of
3824 - bpo-35859: :mod:`re` module, fix a few bugs about capturing group. In rare
3828 -------------
3830 - bpo-45099: Document internal :mod:`asyncio` API.
3832 - bpo-47126: Update PEP URLs to :pep:`676`'s new canonical form.
3834 - bpo-47040: Clarified the old Python versions compatiblity note of
3838 - bpo-46033: Clarify ``for`` statement execution in its doc.
3840 - bpo-45790: Adjust inaccurate phrasing in
3844 - bpo-42340: Document that in some circumstances :exc:`KeyboardInterrupt`
3848 - bpo-41233: Link the errnos referenced in ``Doc/library/exceptions.rst`` to
3854 -----
3856 - bpo-47205: Skip test for :func:`~os.sched_getaffinity` and
3859 - bpo-46126: Restore 'descriptions' when running tests internally.
3861 - bpo-47104: Rewrite :func:`asyncio.to_thread` tests to use
3864 - bpo-40280: The test suite is now passing on the Emscripten platform. All
3865   fork, socket, and subprocess-based tests are skipped.
3867 - bpo-47037: Skip ``strftime("%4Y")`` feature test on Windows. It can cause
3870 - bpo-46587: Skip tests if platform's ``strftime`` does not support
3871   non-portable glibc extensions.
3873 - bpo-47015: A test case for :func:`os.sendfile` is converted from
3878 -----
3880 - bpo-40280: Add configure option :option:`--enable-wasm-dynamic-linking` to
3881   enable ``dlopen`` and MAIN_MODULE / SIDE_MODULE on ``wasm32-emscripten``.
3883 - bpo-46023: ``makesetup`` now detects and skips all duplicated module
3886 - bpo-40280: Add SOABI ``wasm32-emscripten`` for Emscripten and
3887   ``wasm32-wasi`` for WASI on 32bit WASM as well as ``wasm64`` counter
3890 - bpo-47032: Ensure Windows install builds fail correctly with a non-zero
3893 - bpo-47024: Update OpenSSL to 1.1.1n for macOS installers and all Windows
3896 - bpo-46996: The :mod:`tkinter` package now requires Tcl/Tk version 8.5.12
3899 - bpo-46973: Add ``regen-configure`` make target to regenerate configure
3903 - bpo-46917: Building Python now requires support of IEEE 754 floating point
3906 - bpo-45774: ``configure`` now verifies that all SQLite C APIs needed for
3910 -------
3912 - bpo-47194: Update ``zlib`` to v1.2.12 to resolve CVE-2018-25032.
3914 - bpo-47171: Enables installing the :file:`py.exe` launcher on Windows
3917 - bpo-46566: Upgraded :ref:`launcher` to support a new ``-V:company/tag``
3919   ``-64`` suffix on arguments is deprecated, but still selects any
3920   non-32-bit install. Setting :envvar:`PYLAUNCHER_ALLOW_INSTALL` and
3921   specifying a version that is not installed will attempt to install the
3924 - bpo-47086: The installer for Windows now includes documentation as loose
3927 - bpo-46907: Update Windows installer to use SQLite 3.38.1.
3929 - bpo-44549: Update bzip2 to 1.0.8 in Windows builds to mitigate
3930   CVE-2016-3189 and CVE-2019-12900
3932 - bpo-46948: Prevent CVE-2022-26488 by ensuring the Add to PATH option in
3936 -----
3938 - bpo-46890: Fix a regression in the setting of ``sys._base_executable`` in
3942 - bpo-46907: Update macOS installer to SQLite 3.38.1.
3945 -----------
3947 - bpo-40280: Replace Emscripten's limited shell with Katie Bell's browser-ui
3948   REPL from python-wasm project.
3951 -----
3953 - bpo-40421: Add ``PyFrame_GetBuiltins``, ``PyFrame_GetGenerator`` and
3954   ``PyFrame_GetGlobals`` C-API functions to access frame object attributes
3957 - bpo-46850: Move the private ``_PyFrameEvalFunction`` type, and private
3961   ``_PyInterpreterFrame`` type which is part of the internal C API. Patch by
3964 - bpo-46850: Move the private undocumented ``_PyEval_EvalFrameDefault()``
3966   ``_PyInterpreterFrame`` type which is part of the internal C API. Patch by
3969 - bpo-46850: Remove the private undocumented function
3973 - bpo-46850: Remove the private undocumented function
3978 - bpo-46850: Remove the following private undocumented functions from the C
3989 - bpo-46987: Remove private functions ``_PySys_GetObjectId()`` and
3990   ``_PySys_SetObjectId()``. Patch by Dong-hee Na.
3992 - bpo-46906: Add new functions to pack and unpack C double (serialize and
4002 *Release date: 2022-03-07*
4005 -----------------
4007 - bpo-46940: Avoid overriding :exc:`AttributeError` metadata information for
4010 - bpo-46927: Include the type's name in the error message for subscripting
4011   non-generic types.
4013 - bpo-46921: Support vectorcall for ``super()``. Patch by Ken Jin.
4015 - bpo-46841: Fix incorrect handling of inline cache entries when
4018 - bpo-46841: Use an oparg to simplify the construction of helpful error
4021 - bpo-46903: Make sure that str subclasses can be used as attribute names
4024 - bpo-46841: Add more detailed specialization failure stats for
4027 - bpo-46891: Fix bug introduced during 3.11alpha where subclasses of
4031 - bpo-46841: Use inline caching for :opcode:`LOAD_ATTR`,
4034 - bpo-46841: Use inline cache for :opcode:`BINARY_SUBSCR`.
4036 - bpo-46841: Use inline caching for :opcode:`COMPARE_OP`.
4038 - bpo-46864: Deprecate ``PyBytesObject.ob_shash``. It will be removed in
4041 - bpo-46841: Use inline caching for :opcode:`UNPACK_SEQUENCE`.
4043 - bpo-46845: Reduces dict size by removing hash value from hash table when
4048 - bpo-46841: Use inline cache for :opcode:`LOAD_GLOBAL`.
4050 - bpo-46852: Rename the private undocumented ``float.__set_format__()``
4052   3.7. The method is only used by test_float. Patch by Victor Stinner.
4054 - bpo-46852: Remove the undocumented private ``float.__set_format__()``
4059 - bpo-40116: Fix regression that dict.update(other) may don't respect
4060   iterate order of other when other is key sharing dict.
4062 - bpo-46712: Share global string identifiers in deep-frozen modules.
4064 - bpo-46430: Fix memory leak in interned strings of deep-frozen modules.
4066 - bpo-46841: Store :opcode:`BINARY_OP` caches inline using a new
4069 - bpo-45107: Specialize ``LOAD_METHOD`` for instances with a dict.
4071 - bpo-44337: Reduce the memory usage of specialized :opcode:`LOAD_ATTR` and
4074 - bpo-46729: Add number of sub-exceptions to :meth:`BaseException.__str__`.
4076 - bpo-45885: Don't un-adapt :opcode:`COMPARE_OP` when collecting
4079 - bpo-46329: Fix specialization stats gathering for :opcode:`PRECALL`
4082 - bpo-46794: Bump up the libexpat version into 2.4.6
4084 - bpo-46823: Implement a specialized combined opcode
4087 - bpo-46820: Fix parsing a numeric literal immediately (without spaces)
4091 - bpo-46329: Move ``KW_NAMES`` before ``PRECALL`` instruction in call
4095 - bpo-46808: Remove the ``NEXT_BLOCK`` macro from compile.c, and make the
4098 - bpo-46329: Add ``PUSH_NULL`` instruction. This is used as a prefix when
4103   There is no change in semantics.
4105 - bpo-46762: Fix an assert failure in debug builds when a '<', '>', or '='
4106   is the last character in an f-string that's missing a closing right brace.
4108 - bpo-46730: Message of AttributeError caused by getting, setting or
4110   the attribute is in fact a property and also specifies type of the class
4113 - bpo-46724: Make sure that all backwards jumps use the ``JUMP_ABSOLUTE``
4117 - bpo-46732: Correct the docstring for the :meth:`__bool__` method. Patch by
4120 - bpo-46072: Add more detailed specialization failure statistics for
4123 - bpo-46707: Avoid potential exponential backtracking when producing some
4126 - bpo-46323: :mod:`ctypes` now allocates memory on the stack instead of on
4128   by Dong-hee Na.
4130 - bpo-45923: Add a quickened form of :opcode:`RESUME` that skips quickening
4133 - bpo-46702: Specialize :opcode:`UNPACK_SEQUENCE` for :class:`tuple` and
4136 - bpo-46072: Opcode pair stats are now gathered with ``--enable-pystats``.
4140 - bpo-46675: Allow more than 16 items in a split dict before it is combined.
4141   The limit is now 254.
4143 - bpo-40479: Add a missing call to ``va_end()`` in
4146 - bpo-46323: Use :c:func:`PyObject_Vectorcall` while calling ctypes callback
4147   function. Patch by Dong-hee Na.
4149 - bpo-46615: When iterating over sets internally in ``setobject.c``, acquire
4151   crashes in corner-cases of various set operations where the set gets
4154 - bpo-45828: The bytecode compiler now attempts to apply runtime stack
4155   manipulations at compile-time (whenever it is feasible to do so).
4157 - bpo-30496: Fixed a minor portability issue in the implementation of
4158   :c:func:`PyLong_FromLong`, and added a fast path for single-digit integers
4162 -------
4164 - bpo-25707: Fixed a file leak in :func:`xml.etree.ElementTree.iterparse`
4165   when the iterator is not exhausted. Patch by Jacob Walls.
4167 - bpo-46877: Export :func:`unittest.doModuleCleanups` in :mod:`unittest`.
4170 - bpo-46848: For performance, use the optimized string-searching
4174 - bpo-46736: :class:`~http.server.SimpleHTTPRequestHandler` now uses HTML5
4175   grammar. Patch by Dong-hee Na.
4177 - bpo-44886: Inherit asyncio proactor datagram transport from
4180 - bpo-46827: Support UDP sockets in  :meth:`asyncio.loop.sock_connect` for
4181   selector-based event loops.  Patch by Thomas Grainger.
4183 - bpo-46811: Make test suite support Expat >=2.4.5
4185 - bpo-46252: Raise :exc:`TypeError` if :class:`ssl.SSLSocket` is passed to
4186   transport-based APIs.
4188 - bpo-46784: Fix libexpat symbols collisions with user dynamically loaded or
4191 - bpo-46786: The HTML serialisation in xml.etree.ElementTree now writes
4195 - bpo-39327: :func:`shutil.rmtree` can now work with VirtualBox shared
4196   folders when running from the guest operating-system.
4198 - bpo-45390: Propagate :exc:`asyncio.CancelledError` message from inner task
4201 - bpo-46756: Fix a bug in
4208 - bpo-46737: :func:`random.gauss` and :func:`random.normalvariate` now have
4211 - bpo-46752: Add task groups to asyncio (structured concurrency, inspired by
4216 - bpo-46724: Fix :mod:`dis` behavior on negative jump offsets.
4218 - bpo-46333: The :meth:`__repr__` method of :class:`typing.ForwardRef` now
4219   includes the ``module`` parameter of :class:`typing.ForwardRef` when it is
4222 - bpo-46643: In :func:`typing.get_type_hints`, support evaluating
4226 - bpo-45863: When the :mod:`tarfile` module creates a pax format archive, it
4229   existing full-precision timestamps in the pax extended header.
4231 - bpo-46066: Deprecate kwargs-based syntax for :class:`typing.TypedDict`
4235 - bpo-46676: Make :data:`typing.ParamSpec` args and kwargs equal to
4238 - bpo-46323: ``ctypes.CFUNCTYPE()`` and ``ctypes.WINFUNCTYPE()`` now fail to
4243 - bpo-46672: Fix ``NameError`` in :func:`asyncio.gather` when initial type
4246 - bpo-46659: The :class:`calendar.LocaleTextCalendar` and
4249   :func:`locale.getdefaultlocale`, if no locale is specified. Patch by
4252 - bpo-46659: The :func:`locale.getdefaultlocale` function is deprecated and
4257 - bpo-46655: In :func:`typing.get_type_hints`, support evaluating bare
4260 - bpo-45948: Fixed a discrepancy in the C implementation of the
4266 - bpo-46626: Expose Linux's ``IP_BIND_ADDRESS_NO_PORT`` option in
4269 - bpo-46521: Fix a bug in the :mod:`codeop` module that was incorrectly
4272 - bpo-46571: Improve :func:`typing.no_type_check`.
4277 - bpo-46400: expat: Update libexpat from 2.4.1 to 2.4.4
4279 - bpo-46556: Deprecate undocumented support for using a
4282 - bpo-46534: Implement :pep:`673` :class:`typing.Self`. Patch by James
4283   Hilton-Balfe.
4285 - bpo-46522: Make various module ``__getattr__`` AttributeErrors more
4288 - bpo-46475: Add :data:`typing.Never` and :func:`typing.assert_never`. Patch
4291 - bpo-46333: The :meth:`__eq__` and :meth:`__hash__` methods of
4296 - bpo-46246: Add missing ``__slots__`` to
4299 - bpo-46232: The :mod:`ssl` module now handles certificates with bit strings
4302 - bpo-46195: :func:`typing.get_type_hints` no longer adds ``Optional`` to
4306 - bpo-31369: Add :class:`~re.RegexFlag` to ``re.__all__`` and documented it.
4309 - bpo-45898: :mod:`ctypes` no longer defines ``ffi_type_*`` symbols in
4312 - bpo-44953: Calling ``operator.itemgetter`` objects and
4313   ``operator.attrgetter`` objects is now faster due to use of the vectorcall
4316 - bpo-44289: Fix an issue with :meth:`~tarfile.is_tarfile` method when using
4320 - bpo-44011: Reimplement SSL/TLS support in asyncio, borrow the
4323 - bpo-41086: Make the :class:`configparser.ConfigParser` constructor raise
4324   :exc:`TypeError` if the ``interpolation`` parameter is not of type
4327 - bpo-29418: Implement :func:`inspect.ismethodwrapper` and fix
4328   :func:`inspect.isroutine` for cases where methodwrapper is given. Patch by
4331 - bpo-14156: argparse.FileType now supports an argument of '-' in binary
4334   when argument is '-'. Patch contributed by Josh Rosenberg
4337 -------------
4339 - bpo-42238: ``Doc/tools/rstlint.py`` has moved to its own repository and is
4340   now packaged on PyPI as ``sphinx-lint``.
4343 -----
4345 - bpo-46913: Fix test_faulthandler.test_sigfpe() if Python is built with
4349 - bpo-46760: Remove bytecode offsets from expected values in test.test_dis
4352 - bpo-46708: Prevent default asyncio event loop policy modification warning
4355 - bpo-46678: The function ``make_legacy_pyc`` in
4357   ``PYTHONPYCACHEPREFIX`` is set to a directory on a different device from
4360 - bpo-46623: Skip test_pair() and test_speech128() of test_zlib on s390x
4365 -----
4367 - bpo-46860: Respect `--with-suffix` when building on case-insensitive file
4370 - bpo-46656: Building Python now requires a C11 compiler. Optional C11
4373 - bpo-46656: Building Python now requires support for floating point
4374   Not-a-Number (NaN): remove the ``Py_NO_NAN`` macro. Patch by Victor
4377 - bpo-46640: Building Python now requires a C99 ``<math.h>`` header file
4378   providing a ``NAN`` constant, or the ``__builtin_nan()`` built-in
4381 - bpo-46608: Exclude marshalled-frozen data if deep-freezing to save 300 KB
4385 - bpo-40280: Fix wasm32-emscripten test failures and platform issues. -
4387   getrusage, prlimit, mkfifo, mknod, setres[gu]id, setgroups. - Use fd_count
4388   to cound open fds. - Add more checks for subprocess and fork. - Add
4389   workarounds for missing _multiprocessing and failing socket.accept(). -
4390   Enable bzip2. - Disable large file support. - Disable signal.alarm.
4392 - bpo-46430: Intern strings in deep-frozen modules. Patch by Kumar Aditya.
4395 -------
4397 - bpo-46744: The default all users install directory for ARM64 is now under
4399   which is intended for ARM (32-bit) files.
4401 - bpo-46567: Adds Tcl and Tk support for Windows ARM64. This also adds IDLE
4404 - bpo-46638: Ensures registry virtualization is consistently disabled. For
4406   while for 3.11 and later it is disabled (registry modifications affect all
4410 ----
4412 - bpo-46630: Make query dialogs on Windows start with a cursor in the entry
4415 - bpo-45447: Apply IDLE syntax highlighting to `.pyi` files. Patch by Alex
4419 -----
4421 - bpo-46748: Python's public headers no longer import ``<stdbool.h>``,
4425 - bpo-46836: Move the :c:type:`PyFrameObject` type definition (``struct
4429 - bpo-45459: Rename ``Include/buffer.h`` header file to
4433 - bpo-45412: Remove the ``HAVE_PY_SET_53BIT_PRECISION`` macro (moved to the
4436 - bpo-46613: Added function :c:func:`PyType_GetModuleByDef`, which allows
4437   accesss to module state when a method's defining class is not available.
4443 *Release date: 2022-02-03*
4446 -----------------
4448 - bpo-45773: Remove two invalid "peephole" optimizations from the bytecode
4451 - bpo-46564: Do not create frame objects when creating :class:`super`
4454 - bpo-45885: Added more fined-grained specialization failure stats regarding
4457 - bpo-44977: The delegation of :func:`int` to :meth:`__trunc__` is now
4462 - bpo-46458: Reorder code emitted by the compiler for a
4463   :keyword:`try`-:keyword:`except` block so that the :keyword:`else` block's
4464   code immediately follows the :keyword:`try` body (without a jump). This is
4467 - bpo-46527: Allow passing ``iterable`` as a keyword argument to
4470 - bpo-46528: Replace several stack manipulation instructions (``DUP_TOP``,
4474 - bpo-46329: Use two or three bytecodes to implement most calls.
4483   This partition into pre-call and call allows better specialization, and
4486   There is no change in semantics.
4488 - bpo-46503: Fix an assert when parsing some invalid \N escape sequences in
4489   f-strings.
4491 - bpo-46431: Improve error message on invalid calls to
4494 - bpo-46476: Fix memory leak in code objects generated by deepfreeze. Patch
4497 - bpo-46481: Speed up calls to :meth:`weakref.ref.__call__` by using the
4498   :pep:`590` ``vectorcall`` calling convention. Patch by Dong-hee Na.
4500 - bpo-46417: Fix a race condition on setting a type ``__bases__`` attribute:
4507 - bpo-46417: ``python -X showrefcount`` now shows the total reference count
4511 - bpo-43683: Add ASYNC_GEN_WRAP opcode to wrap the value to be yielded in
4515 - bpo-46407: Optimize some modulo operations in ``Objects/longobject.c``.
4518 - bpo-46409: Add new ``RETURN_GENERATOR`` bytecode to make generators.
4525 - bpo-46406: The integer division ``//`` implementation has been optimized
4530 - bpo-46383: Fix invalid signature of ``_zoneinfo``'s ``module_free``
4531   function to resolve a crash on wasm32-emscripten platform.
4533 - bpo-46361: Ensure that "small" integers created by :meth:`int.from_bytes`
4536 - bpo-46161: Fix the class building error when the arguments are constants
4537   and CALL_FUNCTION_EX is used.
4539 - bpo-46028: Fixes calculation of :data:`sys._base_executable` when inside a
4543 - bpo-46091: Correctly calculate indentation levels for lines with
4547 - bpo-30512: Add CAN Socket support for NetBSD.
4549 - bpo-46045: Do not use POSIX semaphores on NetBSD
4551 - bpo-44024: Improve the exc:`TypeError` message for non-string second
4552   arguments passed to the built-in functions :func:`getattr` and
4556 -------
4558 - bpo-46624: Restore support for non-integer arguments of
4561 - bpo-46591: Make the IDLE doc URL on the About IDLE dialog clickable.
4563 - bpo-46565: Remove loop variables that are leaking into modules'
4566 - bpo-46553: In :func:`typing.get_type_hints`, support evaluating bare
4569 - bpo-46544: Don't leak ``x`` & ``uspace`` intermediate vars in
4572 - bpo-46487: Add the ``get_write_buffer_limits`` method to
4575 - bpo-45173: Note the configparser deprecations will be removed in Python
4578 - bpo-45162: The deprecated :mod:`unittest` APIs removed in 3.11a1 have been
4582 - bpo-46539: In :func:`typing.get_type_hints`, support evaluating
4586 - bpo-46510: Add missing test for :class:`types.TracebackType` and
4590 - bpo-46491: Allow :data:`typing.Annotated` to wrap :data:`typing.Final` and
4593 - bpo-46483: Remove :meth:`~object.__class_getitem__` from
4596 - bpo-46436: Fix command-line option ``-d``/``--directory`` in module
4597   :mod:`http.server` which is ignored when combined with command-line option
4598   ``--cgi``. Patch by Géry Ogam.
4600 - bpo-41403: Make :meth:`mock.patch` raise a :exc:`TypeError` with a
4604 - bpo-46474: In ``importlib.metadata.EntryPoint.pattern``, avoid potential
4607 - bpo-46474: Removed private method from ``importlib.metadata.Path``. Sync
4610 - bpo-46470: Remove unused branch from ``typing._remove_dups_flatten``
4612 - bpo-46469: :mod:`asyncio` generic classes now return
4616 - bpo-41906: Support passing filter instances in the ``filters`` values of
4620 - bpo-46422: Use ``dis.Positions`` in ``dis.Instruction`` instead of a
4623 - bpo-46434: :mod:`pdb` now gracefully handles ``help`` when :attr:`__doc__`
4624   is missing, for example when run with pregenerated optimized ``.pyc``
4627 - bpo-43869: Python uses the same time Epoch on all platforms. Add an
4630 - bpo-46414: Add :func:`typing.reveal_type`. Patch by Jelle Zijlstra.
4632 - bpo-40280: :mod:`subprocess` now imports Windows-specific imports when
4633   ``msvcrt`` module is available, and POSIX-specific imports on all other
4634   platforms. This gives a clean exception when ``_posixsubprocess`` is not
4637 - bpo-40066: ``IntEnum``, ``IntFlag``, and ``StrEnum`` use the mixed-in type
4640 - bpo-46316: Optimize :meth:`pathlib.Path.iterdir` by removing an
4643 - bpo-29688: Document :meth:`pathlib.Path.absolute` (which has always
4646 - bpo-43012: The pathlib module's obsolete and internal ``_Accessor`` class
4650 - bpo-46258: Speed up :func:`math.isqrt` for small positive integers by
4653 - bpo-46242: Improve error message when creating a new :class:`enum.Enum`
4657 - bpo-43118: Fix a bug in :func:`inspect.signature` that was causing it to
4661 - bpo-26552: Fixed case where failing :func:`asyncio.ensure_future` did not
4664 - bpo-21987: Fix an issue with :meth:`tarfile.TarFile.getmember` getting a
4667 - bpo-46124: Update :mod:`zoneinfo` to rely on importlib.resources
4670 - bpo-46103: Now :func:`inspect.getmembers` only gets :attr:`__bases__`
4673 - bpo-46080: Fix exception in argparse help text generation if a
4674   :class:`argparse.BooleanOptionalAction` argument's default is
4678 - bpo-44791: Fix substitution of :class:`~typing.ParamSpec` in
4685 -------------
4687 - bpo-46463: Fixes :file:`escape4chm.py` script used when building the CHM
4691 -----
4693 - bpo-43478: Mocks can no longer be provided as the specs for other Mocks.
4694   As a result, an already-mocked object cannot be passed to `mock.Mock()`.
4695   This can uncover bugs in tests since these Mock-derived Mocks will always
4699 - bpo-46616: Ensures ``test_importlib.test_windows`` cleans up registry keys
4702 - bpo-44359: test_ftplib now silently ignores socket errors to prevent
4705 - bpo-46600: Fix test_gdb.test_pycfunction() for Python built with ``clang
4706   -Og``. Tolerate inlined functions in the gdb traceback. Patch by Victor
4709 - bpo-46542: Fix a Python crash in test_lib2to3 when using Python built in
4712 - bpo-46576: test_peg_generator now disables compiler optimization when
4714   testing on non-debug builds of CPython.
4716 - bpo-46542: Fix ``test_json`` tests checking for :exc:`RecursionError`:
4720 - bpo-13886: Skip test_builtin PTY tests on non-ASCII characters if the
4721   readline module is loaded. The readline module changes input() behavior,
4722   but test_builtin is not intented to test the readline module. Patch by
4725 - bpo-40280: Add :func:`test.support.requires_fork` decorators to mark tests
4728 - bpo-40280: Add :func:`test.support.requires_subprocess` decorator to mark
4730   wasm32-emscripten platform has no support for processes.
4732 - bpo-46126: Disable 'descriptions' when running tests internally.
4735 -----
4737 - bpo-46602: Tidied up configure.ac so that conftest.c is truncated rather
4742 - bpo-46600: Fix the test checking if the C compiler supports ``-Og`` option
4743   in the ``./configure`` script to also use ``-Og`` on clang which supports
4746 - bpo-38472: Fix GCC detection in setup.py when cross-compiling. The C
4747   compiler is now run with LC_ALL=C. Previously, the detection failed with a
4750 - bpo-46513: :program:`configure` no longer uses ``AC_C_CHAR_UNSIGNED``
4754 - bpo-46471: Use global singletons for single byte bytes objects in
4757 - bpo-46443: Deepfreeze now uses cached small integers as it saves some
4760 - bpo-46429: Merge all deep-frozen files into one for space savings. Patch
4763 - bpo-45569: The build now defaults to using 30-bit digits for Python
4764   integers. Previously either 15-bit or 30-bit digits would be selected,
4765   depending on the platform. 15-bit digits may still be selected using the
4766   ``--enable-big-digits=15`` option to the ``configure`` script, or by
4769 - bpo-45925: Update Windows installer to use SQLite 3.37.2.
4771 - bpo-43112: Detect musl libc as a separate SOABI (tagged as
4772   ``linux-musl``).
4775 -------
4777 - bpo-33125: The traditional EXE/MSI based installer for Windows is now
4780 - bpo-46362: os.path.abspath("C:\CON") is now fixed to return "\\.\CON", not
4784 - bpo-44934: The installer now offers a command-line only option to add the
4789 -----
4791 - bpo-45925: Update macOS installer to SQLite 3.37.2.
4794 ----
4796 - bpo-45296: Clarify close, quit, and exit in IDLE.  In the File menu,
4797   'Close' and 'Exit' are now 'Close Window' (the current one) and 'Exit' is
4802 -----
4804 - bpo-40170: Remove the ``PyHeapType_GET_MEMBERS()`` macro. It was exposed
4809 - bpo-40170: Move _Py_GetAllocatedBlocks() and _PyObject_DebugMallocStats()
4812 - bpo-46433: The internal function _PyType_GetModuleByDef now correctly
4815 - bpo-45459: :c:type:`Py_buffer` and various ``Py_buffer`` related functions
4818 - bpo-14916: Fixed bug in the tokenizer that prevented
4825 *Release date: 2022-01-13*
4828 -----------------
4830 - bpo-46070: :c:func:`Py_EndInterpreter` now explicitly untracks all objects
4836 - bpo-46347: Fix memory leak in PyEval_EvalCodeEx.
4838 - bpo-46339: Fix a crash in the parser when retrieving the error text for
4839   multi-line f-strings expressions that do not start in the first line of
4842 - bpo-46331: Do not set line number of instruction storing doc-string. Fixes
4845 - bpo-46314: Remove spurious "call" event when creating a lambda function
4848 - bpo-46289: ASDL declaration of ``FormattedValue`` has changed to reflect
4849   ``conversion`` field is not optional.
4851 - bpo-46297: Fixed an interpreter crash on bootup with multiple PythonPaths
4854 - bpo-46237: Fix the line number of tokenizer errors inside f-strings. Patch
4857 - bpo-46263: We always expect the "use_frozen_modules" config to be set, now
4860 - bpo-46006: Fix a regression when a type method like ``__init__()`` is
4864   with subinterpreters: the internal interned dictionary is shared again by
4867 - bpo-45923: Add RESUME opcode. This is a logical no-op. It is emitted by
4868   the compiler anywhere a Python function can be entered. It is used by the
4871 - bpo-46208: Fix the regression of os.path.normpath("A/../../B") not
4874 - bpo-46240: Correct the error message for unclosed parentheses when the
4875   tokenizer doesn't reach the end of the source when the error is reported.
4878 - bpo-46009: Remove the ``GEN_START`` opcode.
4880 - bpo-46235: Certain sequence multiplication operations like ``[0] * 1_000``
4881   are now faster due to reference-counting optimizations. Patch by Dennis
4884 - bpo-46221: :opcode:`PREP_RERAISE_STAR` no longer pushes ``lasti`` to the
4887 - bpo-46202: Remove :opcode:`POP_EXCEPT_AND_RERAISE` and replace it by an
4890 - bpo-46085: Fix iterator cache mechanism of :class:`OrderedDict`.
4892 - bpo-46055: Speed up shifting operation involving integers less than
4895 - bpo-46110: Add a maximum recursion check to the PEG parser to avoid stack
4898 - bpo-46107: Fix bug where :meth:`ExceptionGroup.split` and
4902 - bpo-45711: The interpreter state's representation of handled exceptions
4907 - bpo-44525: Replace the four call bytecode instructions which one pre-call
4916 - bpo-46039: Remove the ``YIELD_FROM`` instruction and replace it with the
4920 - bpo-45635: The code called from :c:func:`_PyErr_Display` was refactored to
4924 - bpo-46054: Fix parser error when parsing non-utf8 characters in source
4927 - bpo-46042: Improve the location of the caret in :exc:`SyntaxError`
4930 - bpo-46049: Ensure :file:`._pth` files work as intended on platforms other
4933 - bpo-46048: Fixes parsing of :file:`._pth` files on startup so that
4934   single-character paths are correctly read.
4936 - bpo-37971: Fix a bug where the line numbers given in a traceback when a
4939 - bpo-46031: Add :opcode:`POP_JUMP_IF_NOT_NONE` and
4942 - bpo-45654: Deepfreeze :mod:`runpy`, patch by Kumar Aditya.
4944 - bpo-46025: Fix a crash in the :mod:`atexit` module involving functions
4948 - bpo-46000: Improve compatibility of the :mod:`curses` module with NetBSD
4951 - bpo-44525: Specialize the CALL_FUNCTION instruction for calls to builtin
4955 - bpo-42918: Fix bug where the built-in :func:`compile` function did not
4959 - bpo-45953: The main interpreter in _PyRuntimeState.interpreters is now
4965 - bpo-45292: Complete the :pep:`654` implementation: add ``except*``.
4967 - bpo-43413: Revert changes in ``set.__init__``. Subclass of :class:`set`
4971 - bpo-43931: Added the :c:data:`Py_Version` constant which bears the same
4975 -------
4977 - bpo-46342: The ``@typing.final`` decorator now sets the ``__final__``
4981 - bpo-46328: Added the :meth:`sys.exception` method which returns the active
4984 - bpo-46307: Add :meth:`string.Template.is_valid` and
4987 - bpo-46306: Assume that :class:`types.CodeType` always has
4990 - bpo-40479: Fix :mod:`hashlib` *usedforsecurity* option to work correctly
4993 - bpo-46070: Fix possible segfault when importing the :mod:`asyncio` module
4994   from different sub-interpreters in parallel. Patch by Erlend E. Aasland.
4996 - bpo-46244: Removed ``__slots__`` from :class:`typing.ParamSpec` and
4999 - bpo-46278: Reflect ``context`` argument in ``AbstractEventLoop.call_*()``
5002 - bpo-46269: Remove special-casing of ``__new__`` in
5005 - bpo-46266: Improve day constants in :mod:`calendar`.
5010 - bpo-46257: Optimized the mean, variance, and stdev functions in the
5011   statistics module. If the input is an iterator, it is consumed in a single
5013   algorithm is about twice as fast as the previous two pass code.
5015 - bpo-41011: Added two new variables to *pyvenv.cfg* which is generated by
5019 - bpo-46239: Improve error message when importing
5020   :mod:`asyncio.windows_events` on non-Windows.
5022 - bpo-46238: Reuse ``_winapi`` constants in ``asyncio.windows_events``.
5024 - bpo-46222: Adding ``SF_NOCACHE`` sendfile constant for FreeBSD for the
5027 - bpo-37295: Add fast path for ``0 <= k <= n <= 67`` for :func:`math.comb`.
5029 - bpo-46176: Adding the ``MAP_STACK`` constant for the mmap module.
5031 - bpo-43424: Deprecate :attr:`webbrowser.MacOSXOSAScript._name` and use
5034 - bpo-45321: Added missing error codes to module
5037 - bpo-46125: Refactor tests to test traversable API directly. Includes
5040 - bpo-46118: Moved importlib.resources and its related functionality to a
5043 - bpo-37578: Add *include_hidden* parameter to :func:`~glob.glob` and
5047 - bpo-20369: :func:`concurrent.futures.wait` no longer blocks forever when
5050 - bpo-46105: Honor spec when generating requirement specs with urls and
5053 - bpo-44893: EntryPoint objects are no longer tuples. Recommended means to
5054   access is by attribute ('.name', '.group') or accessor ('.load()'). Access
5055   by index is deprecated and will raise deprecation warning.
5057 - bpo-22815: Print unexpected successes together with failures and errors in
5060 - bpo-22047: Calling :meth:`add_argument_group` on an argument group is
5062   :meth:`add_mutually_exclusive_group` on a mutually exclusive group is
5069 - bpo-26952: :mod:`argparse` raises :exc:`ValueError` with clear message
5073 - bpo-45615: Functions in the :mod:`traceback` module raise :exc:`TypeError`
5074   rather than :exc:`AttributeError` when an exception argument is not of
5077 - bpo-16594: Add allow allow_reuse_port flag in socketserver.
5079 - bpo-27718: Fix help for the :mod:`signal` module. Some functions (e.g.
5082 - bpo-46032: The ``registry()`` method of :func:`functools.singledispatch`
5084   and raises a TypeError if it is not supported. Previously unsupported
5088 - bpo-46014: Add ability to use ``typing.Union`` and ``types.UnionType`` as
5092 - bpo-27062: Add :attr:`__all__` to :mod:`inspect`, patch by Kumar Aditya.
5094 - bpo-46018: Ensure that :func:`math.expm1` does not raise on underflow.
5096 - bpo-46016: Adding :attr:`F_DUP2FD` and :attr:`F_DUP2FD_CLOEXEC` constants
5099 - bpo-45755: :mod:`typing` generic aliases now reveal the class attributes
5101   behavior up to Python 3.6, but was changed in 3.7-3.9.
5103 - bpo-45874: The empty query string, consisting of no query arguments, is
5107 - bpo-44674: Change how dataclasses disallows mutable default values.  It
5112 - bpo-23882: Remove namespace package (PEP 420) support from unittest
5116 - bpo-25066: Added a :meth:`__repr__` method to
5119 - bpo-45643: Added :data:`signal.SIGSTKFLT` on platforms where this signal
5120   is defined.
5122 - bpo-44092: Fetch across rollback no longer raises
5126 - bpo-42413: Replace ``concurrent.futures.TimeoutError`` and
5131 -------------
5133 - bpo-46196: Document method :meth:`cmd.Cmd.columnize`.
5135 - bpo-46120: State that ``|`` is preferred for readability over ``Union`` in
5138 - bpo-46109: Extracted ``importlib.resources`` and
5141 - bpo-19737: Update the documentation for the :func:`globals` function.
5144 -----
5146 - bpo-46296: Add a test case for :mod:`enum` with ``_use_args_ == True`` and
5149 - bpo-46205: Fix hang in runtest_mp due to race condition
5151 - bpo-46263: Fix test_capi on FreeBSD 14-dev: instruct jemalloc to not fill
5154 - bpo-46262: Cover ``ValueError`` path in tests for
5157 - bpo-46150: Now ``fakename`` in
5158   ``test_pathlib.PosixPathTest.test_expanduser`` is checked to be
5159   non-existent.
5161 - bpo-46129: Rewrite ``asyncio.locks`` tests with
5164 - bpo-23819: Fixed :mod:`asyncio` tests in python optimized mode. Patch by
5167 - bpo-46114: Fix test case for OpenSSL 3.0.1 version. OpenSSL 3.0 uses
5171 -----
5173 - bpo-44133: When Python is configured with
5174   :option:`--without-static-libpython`, the Python static library
5175   (libpython.a) is no longer built. Patch by Victor Stinner.
5177 - bpo-44133: When Python is built without :option:`--enable-shared`, the
5178   ``python`` program is now linked to object files, rather than being linked
5183 - bpo-40280: The ``configure`` script has a new option
5184   ``--with-emscripten-target`` to select browser or node as Emscripten build
5187 - bpo-46315: Added and fixed ``#ifdef HAVE_FEATURE`` checks for
5188   functionality that is not available on WASI platform.
5190 - bpo-45723: Fixed a regression in ``configure`` check for
5193 - bpo-46263: ``configure`` no longer sets ``MULTIARCH`` on FreeBSD
5196 - bpo-46106: Updated OpenSSL to 1.1.1m in Windows builds, macOS installer
5199 - bpo-46088: Automatically detect or install bootstrap Python runtime when
5202 - bpo-46072: Add a --with-pystats configure option to turn on internal
5205 - bpo-40280: A new directory ``Tools/wasm`` contains WebAssembly-related
5206   helpers like ``config.site`` override for wasm32-emscripten, wasm assets
5209 - bpo-46023: :program:`makesetup` no longer builds extensions that have been
5213 - bpo-45949: Use pure Python ``freeze_module`` for all but importlib
5214   bootstrap files. ``--with-freeze-module`` :program:`configure` option is
5218 -------
5220 - bpo-46217: Removed parameter that is unsupported on Windows 8.1 and early
5224 -----
5226 - bpo-40477: The Python Launcher app for macOS now properly launches scripts
5230 -----
5232 - bpo-46236: Fix a bug in :c:func:`PyFunction_GetAnnotations` that caused it
5235 - bpo-46140: :c:func:`PyBuffer_GetPointer`,
5243 - bpo-45855: Document that the *no_block* argument to
5244   :c:func:`PyCapsule_Import` is a no-op now.
5246 - bpo-45855: Replaced deprecated usage of
5250 - bpo-46007: The :c:func:`PyUnicode_CHECK_INTERNED` macro has been excluded
5259 *Release date: 2021-12-08*
5262 -----------------
5264 - bpo-46009: Restore behavior from 3.9 and earlier when sending non-None to
5266   generator. In 3.10.0 and 3.10.1 ``gen_func().send(0)`` is equivalent to
5270 - bpo-46004: Fix the :exc:`SyntaxError` location for errors involving for
5273 - bpo-45711: :c:func:`_PyErr_ChainStackItem` no longer normalizes
5275   because ``exc_info`` is always normalized.
5277 - bpo-45607: The ``__note__`` field was added to :exc:`BaseException`. It is
5278   ``None`` by default but can be set to a string which is added to the
5281 - bpo-45947: Place pointers to dict and values immediately before GC header.
5285 - bpo-45915: ``is_valid_fd`` now uses faster ``fcntl(fd, F_GETFD)`` on
5288 - bpo-44530: Reverts a change to the ``code.__new__`` :ref:`audit event
5289   <audit-events>` from an earlier prerelease.
5291 - bpo-42268: Fail the configure step if the selected compiler doesn't
5294 - bpo-45711: The three values of ``exc_info`` are now always consistent with
5298   instance is modified while the exception is handled, as well as
5302 - bpo-45727: Refine the custom syntax error that suggests that a comma may
5306 - bpo-45885: Specialized the ``COMPARE_OP`` opcode using the PEP 659
5309 - bpo-45786: Allocate space for the interpreter frame in the frame object,
5313 - bpo-45614: Fix :mod:`traceback` display for exceptions with invalid module
5316 - bpo-45813: Fix crash when calling coro.cr_frame.clear() after coroutine
5319 - bpo-45811: Improve the tokenizer errors when encountering invisible
5322 - bpo-45848: Allow the parser to obtain error lines directly from encoded
5325 - bpo-45709: Restore behavior from 3.10 when tracing an exception raised
5328 - bpo-44525: Adds new :opcode:`COPY_FREE_VARS` opcode, to make copying of
5332 - bpo-45829: Specialize :opcode:`BINARY_SUBSCR` for classes with a
5335 - bpo-45826: Fixed a crash when calling ``.with_traceback(None)`` on
5339 - bpo-45822: Fixed a bug in the parser that was causing it to not respect
5343 - bpo-45820: Fix a segfault when the parser fails without reading any input.
5346 - bpo-45636: Simplify the implementation of :opcode:`BINARY_OP` by indexing
5349 - bpo-42540: Fix crash when :func:`os.fork` is called with an active
5350   non-default memory allocator.
5352 - bpo-45738: Fix computation of error location for invalid continuation
5355 - bpo-45636: Remove an existing "fast path" for old-style string formatting,
5358 - bpo-45753: Make recursion checks a bit more efficient by tracking amount
5361 - bpo-45773: Fix a compiler hang when attempting to optimize certain jump
5364 - bpo-45764: The parser now gives a better error message when leaving out
5365   the opening parenthesis ``(`` after a ``def``-statement::
5373 - bpo-45609: Specialized the ``STORE_SUBSCR`` opcode using the PEP 659
5376 - bpo-45636: Replace all numeric ``BINARY_*`` and ``INPLACE_*`` instructions
5379 - bpo-45582: Path calculation (known as ``getpath``) has been reimplemented
5384 - bpo-45450: Improve the syntax error message for parenthesized arguments.
5388 -------
5390 - bpo-27946: Fix possible crash when getting an attribute of
5394 - bpo-45711: Make :mod:`asyncio` normalize exceptions as soon as they are
5397   codebase, where an exc_info triplet is always normalized.
5399 - bpo-23819: Replaced asserts with exceptions in asyncio, patch by Kumar
5402 - bpo-13236: :class:`unittest.TextTestResult` and
5405 - bpo-45917: Added :func:`math.exp2`:, which returns 2 raised to the power
5408 - bpo-37658: Fix issue when on certain conditions ``asyncio.wait_for()`` may
5412 - bpo-45876: Improve the accuracy of stdev() and pstdev() in the statistics
5413   module.  When the inputs are floats or fractions, the output is a
5416 - bpo-44649: Handle dataclass(slots=True) with a field that has default a
5419 - bpo-45803: Added missing kw_only parameter to
5422 - bpo-45837: The :meth:`turtle.RawTurtle.settiltangle` is deprecated since
5433 - bpo-45831: :mod:`faulthandler` can now write ASCII-only strings (like
5439 - bpo-45828: :mod:`sqlite` C callbacks now use unraisable exceptions if
5442 - bpo-41735: Fix thread lock in ``zlib.Decompress.flush()`` method before
5445 - bpo-45235: Reverted an argparse bugfix that caused regression in the
5449 - bpo-45754: Fix a regression in Python 3.11a1 and 3.11a2 where
5451   SQL statement lengths. Now, ``SQLITE_LIMIT_SQL_LENGTH`` is used. Patch by
5454 - bpo-45766: Added *proportional* option to
5457 - bpo-45765: In importlib.metadata, fix distribution discovery for an empty
5460 - bpo-45757: Fix bug where :mod:`dis` produced an incorrect oparg when
5461   :opcode:`EXTENDED_ARG` is followed by an opcode that does not use its
5464 - bpo-45644: In-place JSON file formatting using ``python3 -m json.tool
5468 - bpo-45703: When a namespace package is imported before another module from
5469   the same namespace is created/installed in a different :data:`sys.path`
5470   location while the program is running, calling the
5472   new module is noticed.
5474 - bpo-45535: Improve output of ``dir()`` with Enums.
5476 - bpo-45664: Fix :func:`types.resolve_bases` and :func:`types.new_class` for
5479 - bpo-45663: Fix :func:`dataclasses.is_dataclass` for dataclasses which are
5482 - bpo-45662: Fix the repr of :data:`dataclasses.InitVar` with a type alias
5483   to the built-in class, e.g. ``InitVar[list[int]]``.
5485 - bpo-43137: Launch GNOME web browsers via gio tool instead of obsolete
5486   gvfs-open
5488 - bpo-45429: On Windows, :func:`time.sleep` now uses a waitable timer which
5489   supports high-resolution timers. Patch by Dong-hee Na and Eryk Sun.
5491 - bpo-37295: Optimize :func:`math.comb` and :func:`math.perm`.
5493 - bpo-45514: Deprecated legacy functions in :mod:`importlib.resources`.
5495 - bpo-45507: Add tests for truncated/missing trailers in gzip.decompress
5498 - bpo-45359: Implement :pep:`585` for :class:`graphlib.TopologicalSorter`.
5500 - bpo-44733: Add ``max_tasks_per_child`` to
5505 - bpo-28806: Improve netrc library. netrc file no longer needs to contain
5506   all tokens. And if the login name is anonymous, security check is no
5509 - bpo-43498: Avoid a possible *"RuntimeError: dictionary changed size during
5513 - bpo-42158: Add MIME types for N-quads, N-triples, Notation3 and TriG to
5516 - bpo-30533: Add :func:`inspect.getmembers_static` , it return all members
5521 -------------
5523 - bpo-42238: ``make -C Doc suspicious`` will be removed soon in favor of
5524   ``make -C Doc check``, mark it as deprecated.
5526 - bpo-45840: Improve cross-references in the documentation for the data
5529 - bpo-45640: Properly marked-up grammar tokens in the documentation are now
5533 - bpo-45788: Link doc for sys.prefix to sysconfig doc on installation paths.
5535 - bpo-45772: ``socket.socket`` documentation is corrected to a class from a
5538 - bpo-45392: Update the docstring of the :class:`type` built-in to remove a
5541 - bpo-45250: Update the documentation to note that CPython does not
5544 - bpo-25381: In the extending chapter of the extending doc, update a
5547 - bpo-43905: Expanded :func:`~dataclasses.astuple` and
5552 -----
5554 - bpo-45695: Out-of-tree builds with a read-only source directory are now
5557 - bpo-19460: Add new Test for
5560 - bpo-45835: Fix race condition in test_queue tests with multiple "feeder"
5563 - bpo-45783: The test for the freeze tool now handles file moves and
5566 - bpo-45745: Remove the ``--findleaks`` command line option of regrtest: use
5567   the ``--fail-env-changed`` option instead. Since Python 3.7, it was a
5568   deprecated alias to the ``--fail-env-changed`` option.
5570 - bpo-45701: Add tests with ``tuple`` type with :func:`functools.lru_cache`
5574 -----
5576 - bpo-44035: CI now verifies that autoconf files have been regenerated with
5579 - bpo-45950: The build system now uses a :program:`_bootstrap_python`
5584 - bpo-45881: The :program:`configure` script now accepts
5585   ``--with-build-python`` and ``--with-freeze-module`` options to make cross
5588 - bpo-40280: Emscripten platform now uses ``.wasm`` suffix by default.
5590 - bpo-40280: Disable unusable core extension modules on WASM/Emscripten
5593 - bpo-40280: ``configure`` now checks for socket ``shutdown`` function. The
5597 - bpo-40280: ``configure`` now checks for functions ``fork1, getegid,
5600 - bpo-33393: Update ``config.guess`` to 2021-06-03 and ``config.sub`` to
5601   2021-08-14. ``Makefile`` now has an ``update-config`` target to make
5604 - bpo-45866: ``make regen-all`` now produces the same output when run from a
5609 - bpo-40280: ``configure`` now accepts machine ``wasm32`` or ``wasm64`` and
5611   ``wasm32-unknown-emscripten``, ``wasm32-wasi``, or
5612   ``wasm32-unknown-wasi``.
5614 - bpo-41498: Python now compiles on platforms without ``sigset_t``. Several
5615   functions in :mod:`signal` are not available when ``sigset_t`` is missing.
5619 - bpo-45881: ``setup.py`` now uses ``CC`` from environment first to discover
5622 - bpo-45886: The ``_freeze_module`` program path can now be overridden on
5626 - bpo-45873: Get rid of the ``_bootstrap_python`` build step. The
5627   deepfreeze.py script is now run using ``$(PYTHON_FOR_REGEN)`` which can be
5630 - bpo-45847: Port builtin hashlib extensions to ``PY_STDLIB_MOD`` macro and
5633 - bpo-45723: Add ``autoconf`` helpers for saving and restoring environment
5645 - bpo-45573: Mandatory core modules, that are required to bootstrap Python,
5648 - bpo-45573: ``configure`` now creates ``Modules/Setup.stdlib`` with
5649   conditionally enabled/disabled extension module lines. The file is not
5652 - bpo-45573: ``configure`` now uses a unified format to set state, compiler
5656 - bpo-45816: Python now supports building with Visual Studio 2022 (MSVC
5659 - bpo-45800: Settings for :mod:`pyexpat` C extension are now detected by
5660   ``configure``. The bundled ``expat`` library is built in ``Makefile``.
5662 - bpo-45798: Settings for :mod:`decimal` internal C extension are now
5663   detected by ``configure``. The bundled ``libmpdec`` library is built in
5666 - bpo-45723: :program:`configure` has a new option ``--with-pkg-config`` to
5667   disable or require pkg-config.
5669 - bpo-45774: The build dependencies for :mod:`sqlite3` are now detected by
5670   ``configure`` and ``pkg-config``. Patch by Erlend E. Aasland.
5672 - bpo-45763: The build dependencies for :mod:`zlib`, :mod:`bz2`, and
5675 - bpo-45747: gdbm and dbm build dependencies are now detected by
5678 - bpo-45743: On macOS, the build system no longer passes
5682 - bpo-45723: ``configure.ac`` is now compatible with autoconf 2.71.
5686 - bpo-45723: ``configure`` now prints a warning when pkg-config is missing.
5688 - bpo-45731: ``configure --enable-loadable-sqlite-extensions`` is now
5692 - bpo-45723: configure.ac now uses custom helper macros and
5695 - bpo-45696: Skip the marshal step for frozen modules by generating C code
5696   that produces a set of ready-to-use code objects. This speeds up startup
5699 - bpo-45561: Run smelly.py tool from $(srcdir).
5702 -------
5704 - bpo-46105: Fixed calculation of :data:`sys.path` in a venv on Windows.
5706 - bpo-45901: When installed through the Microsoft Store and set as the
5709   Python (that is, ``script.py args`` rather than ``python script.py
5712 - bpo-45616: Fix Python Launcher's ability to distinguish between versions
5713   3.1 and 3.10 when either one is explicitly requested.  Previously, 3.1
5717 - bpo-45850: Implement changes to build with deep-frozen modules on Windows.
5720 - bpo-45732: Updates bundled Tcl/Tk to 8.6.12.
5722 - bpo-45720: Internal reference to :file:`shlwapi.dll` was dropped to help
5727 -----
5729 - bpo-45732: Update python.org macOS installer to use Tcl/Tk 8.6.12.
5732 -----
5734 - bpo-39026: Fix Python.h to build C extensions with Xcode: remove a
5741 *Release date: 2021-11-05*
5744 -----------------
5746 - bpo-45716: Improve the :exc:`SyntaxError` message when using ``True``,
5750 - bpo-45688: :data:`sys.stdlib_module_names` now contains the macOS-specific
5753 - bpo-45379: Clarify :exc:`ImportError` message when we try to explicitly
5756 - bpo-44525: Specialize simple calls to Python functions (no starargs,
5759 - bpo-45530: Cases of sorting using tuples as keys may now be significantly
5764   :ref:`expressions-value-comparisons` for information on total ordering).
5765   It's generally true that the result of sorting simply isn't well-defined
5768 - bpo-45526: In obmalloc, set ADDRESS_BITS to not ignore any bits (ignored
5769   16 before). That is safer in the case that the kernel gives user-space
5772 - bpo-30570: Fixed a crash in ``issubclass()`` from infinite recursion when
5775 - bpo-45521: Fix a bug in the obmalloc radix tree code.  On 64-bit machines,
5776   the bug causes the tree to hold 46-bits of virtual addresses, rather than
5777   the intended 48-bits.
5779 - bpo-45494: Fix parser crash when reporting errors involving invalid
5782 - bpo-45445: Python now fails to initialize if it finds an invalid
5783   :option:`-X` option in the command line. Patch by Pablo Galindo.
5785 - bpo-45340: Object attributes are held in an array instead of a dictionary.
5790 - bpo-45408: Fix a crash in the parser when reporting tokenizer errors that
5794 - bpo-29410: Add SipHash13 for string hash algorithm and use it by default.
5796 - bpo-45385: Fix reference leak from descr_check. Patch by Dong-hee Na.
5798 - bpo-45367: Specialized the ``BINARY_MULTIPLY`` opcode to
5802 - bpo-21736: Frozen stdlib modules now have ``__file__`` to the .py file
5806   the stdlib directory is known when the runtime is initialized.  Note that
5807   the file at ``__file__`` is not guaranteed to exist.  None of this affects
5808   non-stdlib frozen modules nor, for now, frozen modules imported using
5809   ``PyImport_ImportFrozenModule()``.  Also, at the moment ``co_filename`` is
5812 - bpo-45020: For frozen stdlib modules, record the original module name as
5813   ``module.__spec__.loader_state.origname``.  If the value is different than
5815   Tools/scripts/freeze_modules.py.  If it is ``None`` then the module comes
5818 - bpo-45324: In FrozenImporter.find_spec(), we now preserve the information
5822 - bpo-45292: Implement :pep:`654`. Add :class:`ExceptionGroup` and
5825 - bpo-40116: Change to the implementation of split dictionaries. Classes
5828   should have no observable effect on users of Python or the C-API. Patch by
5831 - bpo-44050: Extensions that indicate they use global state (by setting
5832   ``m_size`` to -1) can again be used in multiple interpreters. This reverts
5835 - bpo-44525: Setup initial specialization infrastructure for the
5847 - bpo-44511: Improve the generated bytecode for class and mapping patterns.
5849 - bpo-43706: Speed up calls to ``enumerate()`` by using the :pep:`590`
5850   ``vectorcall`` calling convention. Patch by Dong-hee Na.
5853 -------
5855 - bpo-45679: Fix caching of multi-value :data:`typing.Literal`.
5856   ``Literal[True, 2]`` is no longer equal to ``Literal[1, 2]``.
5858 - bpo-42064: Convert :mod:`sqlite3` to multi-phase initialisation (PEP 489).
5861 - bpo-45438: Fix typing.Signature string representation for generic builtin
5864 - bpo-45613: :mod:`sqlite3` now sets :attr:`sqlite3.threadsafety` based on
5868 - bpo-45574: Fix warning about ``print_escape`` being unused.
5870 - bpo-45581: :meth:`sqlite3.connect` now correctly raises :exc:`MemoryError`
5874 - bpo-45557: pprint.pprint() now handles underscore_numbers correctly.
5877 - bpo-44019: Add :func:`operator.call` to ``operator.__all__``. Patch by
5880 - bpo-42174: :meth:`shutil.get_terminal_size` now falls back to sane values
5883 - bpo-35673: Improve the introspectability of the ``__loader__`` attribute
5884   for namespace packages.  :class:`importlib.machinery.NamespaceLoader` is
5886   interface. ``_NamespaceLoader`` is kept for backward compatibility.
5888 - bpo-45515: Add references to :mod:`zoneinfo` in the :mod:`datetime`
5892 - bpo-45475: Reverted optimization of iterating :class:`gzip.GzipFile`,
5893   :class:`bz2.BZ2File`, and :class:`lzma.LZMAFile` (see bpo-43787) because
5897 - bpo-45489: Update :class:`~typing.ForwardRef` to support ``|`` operator.
5898   Patch by Dong-hee Na.
5900 - bpo-42222: Removed deprecated support for float arguments in
5903 - bpo-45428: Fix a regression in py_compile when reading filenames from
5906 - bpo-45467: Fix incremental decoder and stream reader in the
5907   "raw-unicode-escape" codec. Previously they failed if the escape sequence
5910 - bpo-45461: Fix incremental decoder and stream reader in the
5911   "unicode-escape" codec. Previously they failed if the escape sequence was
5914 - bpo-45239: Fixed :func:`email.utils.parsedate_tz` crashing with
5918 - bpo-45417: Fix quadratic behaviour in the enum module: Creation of enum
5921 - bpo-45249: Fix the behaviour of :func:`traceback.print_exc` when
5922   displaying the caret when the ``end_offset`` in the exception is set to 0.
5925 - bpo-45416: Fix use of :class:`asyncio.Condition` with explicit
5929 - bpo-20028: Empty escapechar/quotechar is not allowed when initializing
5930   :class:`csv.Dialect`. Patch by Vajrasky Kok and Dong-hee Na.
5932 - bpo-44904: Fix bug in the :mod:`doctest` module that caused it to fail if
5936 - bpo-45406: Make :func:`inspect.getmodule` catch ``FileNotFoundError``
5940 - bpo-45411: Add extensions for files containing subtitles - .srt & .vtt -
5943 - bpo-10716: Migrated pydoc to HTML5 (without changing the look of it). Side
5944   effect is to update xmlrpc's ``ServerHTMLDoc`` which now uses the CSS too.
5947 - bpo-27580: Add support of null characters in :mod:`csv`.
5949 - bpo-45262: Prevent use-after-free in asyncio. Make sure the cached running
5950   loop holder gets cleared on dealloc to prevent use-after-free in
5953 - bpo-45386: Make :mod:`xmlrpc.client` more robust to C runtimes where the
5957 - bpo-20028: Improve error message of :class:`csv.Dialect` when
5958   initializing. Patch by Vajrasky Kok and Dong-hee Na.
5960 - bpo-45343: Update bundled pip to 21.2.4 and setuptools to 58.1.0
5962 - bpo-45328: Fixed :class:`http.client.HTTPConnection` to work properly in
5965 - bpo-45243: Add :meth:`~sqlite3.Connection.setlimit` and
5970 - bpo-45320: Removed from the :mod:`inspect` module:
5986 - bpo-45192: Fix the ``tempfile._infer_return_type`` function so that the
5992 - bpo-45160: When tracing a tkinter variable used by a ttk OptionMenu,
5995 - bpo-25625: Added non parallel-safe :func:`~contextlib.chdir` context
5999 - bpo-24139: Add support for SQLite extended result codes in
6002 - bpo-24444: Fixed an error raised in :mod:`argparse` help display when help
6003   for an option is set to 1+ blank spaces or when *choices* arg is an empty
6006 - bpo-44547: Implement ``Fraction.__int__``, so that a
6010 - bpo-40321: Adds support for HTTP 308 redirects to :mod:`urllib`. See
6013 - bpo-41374: Ensure that ``socket.TCP_*`` constants are exposed on Cygwin
6016 - bpo-35970: Add help flag to the base64 module's command line interface.
6020 -------------
6022 - bpo-45726: Improve documentation for :func:`functools.singledispatch` and
6025 - bpo-45680: Amend the docs on ``GenericAlias`` objects to clarify that
6026   non-container classes can also implement ``__class_getitem__``. Patch
6029 - bpo-45618: Update Sphinx version used to build the documentation to 4.2.0.
6032 - bpo-45655: Add a new "relevant PEPs" section to the top of the
6035 - bpo-45604: Add ``level`` argument to ``multiprocessing.log_to_stderr``
6038 - bpo-45516: Add protocol description to the
6041 - bpo-45464: Mention in the documentation of :ref:`Built-in Exceptions
6042   <bltin-exceptions>` that inheriting from multiple exception types in a
6043   single subclass is not recommended due to possible memory layout
6046 - bpo-45449: Add note about :pep:`585` in :mod:`collections.abc`.
6048 - bpo-45516: Add protocol description to the
6051 - bpo-20692: Add Programming FAQ entry explaining that int literal attribute
6055 -----
6057 - bpo-45678: Add tests for scenarios in which
6058   :class:`functools.singledispatchmethod` is stacked on top of a method that
6061 - bpo-45578: Add tests for :func:`dis.distb`
6063 - bpo-45678: Add tests to ensure that ``functools.singledispatchmethod``
6066 - bpo-45668: PGO tests now pass when Python is built without test extension
6069 - bpo-45577: Add subtests for all ``pickle`` protocols in ``test_zoneinfo``.
6071 - bpo-45566: Fix ``test_frozen_pickle`` in ``test_dataclasses`` to check all
6074 - bpo-43592: :mod:`test.libregrtest` now raises the soft resource limit for
6075   the maximum number of file descriptors when the default is too low for our
6078 - bpo-39679: Add more test cases for `@functools.singledispatchmethod` when
6081 - bpo-45410: When libregrtest spawns a worker process, stderr is now written
6086 - bpo-45402: Fix test_tools.test_sundry() when Python is built out of tree:
6090 - bpo-45403: Fix test_sys.test_stdlib_dir() when Python is built outside the
6093 - bpo-45400: Fix
6096   "Python-3.11.0a1"): use a stricter regular expression. Patch by Victor
6099 - bpo-10572: Rename :mod:`sqlite3` tests from ``test_sqlite`` to
6104 -----
6106 - bpo-43158: ``setup.py`` now uses values from configure script to build the
6107   ``_uuid`` extension module. Configure now detects util-linux's
6110 - bpo-45666: Fix warning of ``swprintf`` and ``%s`` usage in
6113 - bpo-45548: ``Modules/Setup`` and ``Modules/makesetup`` have been improved.
6118 - bpo-45548: The :mod:`math` and :mod:`cmath` implementation now require a
6122 - bpo-45595: ``setup.py`` and ``makesetup`` now track build dependencies on
6125 - bpo-45571: ``Modules/Setup`` now use ``PY_CFLAGS_NODIST`` instead of
6128 - bpo-45570: :mod:`pyexpat` and :mod:`_elementtree` no longer define
6130   ``XML_POOR_ENTROPY`` is now defined in ``expat_config.h``.
6132 - bpo-43974: ``setup.py`` no longer defines ``Py_BUILD_CORE_MODULE``.
6135 - bpo-45548: Fill in missing entries in Modules/Setup.
6137 - bpo-45532: Update :data:`sys.version` to use ``main`` as fallback
6140 - bpo-45536: The ``configure`` script now checks whether OpenSSL headers and
6144 - bpo-45221: Fixed regression in handling of ``LDFLAGS`` and ``CPPFLAGS``
6146   as one of the built-in command line argument, for example ``-h`` for help.
6148 - bpo-45440: Building Python now requires a C99 ``<math.h>`` header file
6153 - bpo-45405: Prevent ``internal configure error`` when running ``configure``
6154   with recent versions of non-Apple clang.  Patch by David Bohman.
6156 - bpo-45433: Avoid linking libpython with libcrypt.
6159 -------
6161 - bpo-43652: Update Tcl/Tk to 8.6.11, actually this time. The previous
6164 - bpo-45337: venv now warns when the created environment may need to be
6167   is required.
6169 - bpo-43851: Build SQLite ``SQLITE_OMIT_AUTOINIT`` on Windows. Patch by
6173 -----
6175 - bpo-44828: Avoid tkinter file dialog failure on macOS 12 Monterey when
6180 ----
6182 - bpo-45495: Add context keywords 'case' and 'match' to completions list.
6185 -----
6187 - bpo-29103: :c:func:`PyType_FromSpec* <PyType_FromModuleAndSpec>` now
6191 - bpo-45522: The internal freelists for frame, float, list, dict, async
6194 - bpo-35134: Exclude :c:func:`PyWeakref_GET_OBJECT` from the limited C API.
6195   It never worked since the :c:type:`PyWeakReference` structure is opaque in
6198 - bpo-35081: Move the ``interpreteridobject.h`` header file from
6202 - bpo-35134: The non-limited API files ``cellobject.h``, ``classobject.h``,
6207   Files <api-includes>`. If they have been included directly, consider
6210 - bpo-45474: The following items are no longer available when
6211   ``Py_LIMITED_API`` is defined:
6219   These are not part of the :ref:`limited API <stable-abi-list>`.
6223 - bpo-45434: Remove the ``pystrhex.h`` header file. It only contains private
6227 - bpo-45440: Remove the ``Py_FORCE_DOUBLE()`` macro. It was used by the
6230 - bpo-45434: ``<Python.h>`` no longer includes the header files
6232   ``Py_LIMITED_API`` macro is set to ``0x030b0000`` (Python 3.11) or higher.
6236 - bpo-41123: Remove ``Py_UNICODE_COPY()`` and ``Py_UNICODE_FILL()`` macros,
6241 - bpo-45412: Remove the following math macros using the ``errno`` variable:
6251 - bpo-45395: Custom frozen modules (the array set to
6256 - bpo-43760: Add new :c:func:`PyThreadState_EnterTracing`, and
6260 - bpo-44220: :c:var:`PyStructSequence_UnnamedField` is added to the Stable
6267 *Release date: 2021-10-05*
6270 --------
6272 - bpo-42278: Replaced usage of :func:`tempfile.mktemp` with
6275 - bpo-44600: Fix incorrect line numbers while tracing some failed patterns
6278 - bpo-41180: Add auditing events to the :mod:`marshal` module, and stop
6285 - bpo-44394: Update the vendored copy of libexpat to 2.4.1 (from 2.2.8) to
6286   get the fix for the CVE-2013-0340 "Billion Laughs" vulnerability. This
6287   copy is most used on Windows and macOS.
6289 - bpo-43124: Made the internal ``putcmd`` function in :mod:`smtplib`
6293 - bpo-44022: :mod:`http.client` now avoids infinitely reading potential HTTP
6297 -----------------
6299 - bpo-43760: The number of hardware branches per instruction dispatch is
6303 - bpo-45061: Add a deallocator to the bool type to detect refcount bugs in C
6306   Unicode empty string singleton is destroyed by mistake. Patch by Victor
6309 - bpo-24076: sum() was further optimised for summing up single digit
6312 - bpo-45190: Update Unicode databases to Unicode 14.0.0.
6314 - bpo-45167: Fix deepcopying of :class:`types.GenericAlias` objects.
6316 - bpo-45155: :meth:`int.to_bytes` and :meth:`int.from_bytes` now take a
6321 - bpo-44219: Release the GIL while performing ``isatty`` system calls on
6324   :func:`io.open` in text mode is also affected. This change solves a
6327 - bpo-44959: Added fallback to extension modules with '.sl' suffix on HP-UX
6329 - bpo-45121: Fix issue where ``Protocol.__init__`` raises ``RecursionError``
6333 - bpo-44348: The deallocator function of the :exc:`BaseException` type now
6335   :exc:`RecursionError` instance is raised, it can be linked to another
6337   ``__traceback__`` attribute, and then a chain of exceptions is created.
6338   When the chain is destroyed, nested deallocator function calls can crash
6339   with a stack overflow if the chain is too long compared to the available
6342 - bpo-45123: Fix PyAiter_Check to only check for the __anext__ presence (not
6344   -> PyObject_GetAIter.
6346 - bpo-1514420: Interpreter no longer attempts to open files with names in
6350 - bpo-41031: Match C and Python code formatting of unprintable exceptions
6353 - bpo-37330: :func:`open`, :func:`io.open`, :func:`codecs.open` and
6358 - bpo-45083: When the interpreter renders an exception, its name now has a
6366 - bpo-34561: List sorting now uses the merge-ordering strategy from Munro
6367   and Wild's ``powersort()``. Unlike the former strategy, this is provably
6368   near-optimal in the entropy of the distribution of run lengths. Most uses
6371   exceptionally poor. However, as these are all fast linear-time
6372   approximations to a problem that's inherently at best quadratic-time to
6376 - bpo-45056: Compiler now removes trailing unused constants from co_consts.
6378 - bpo-45020: Add a new command line option, "-X frozen_modules=[on|off]" to
6382 - bpo-45012: In :mod:`posix`, release GIL during ``stat()``, ``lstat()``,
6386 - bpo-45018: Fixed pickling of range iterators that iterated for over
6389 - bpo-45000: A :exc:`SyntaxError` is now raised when trying to delete
6390   :const:`__debug__`. Patch by Dong-hee Na.
6392 - bpo-44963: Implement ``send()`` and ``throw()`` methods for
6395 - bpo-44962: Fix a race in WeakKeyDictionary, WeakValueDictionary and
6398   shutdown_asyncgens is not run
6400 - bpo-24234: Implement the :meth:`__bytes__` special method on the
6404 - bpo-24234: Implement the :meth:`__complex__` special method on the
6408 - bpo-44954: Fixed a corner case bug where the result of
6409   ``float.fromhex('0x.8p-1074')`` was rounded the wrong way.
6411 - bpo-44947: Refine the syntax error for trailing commas in import
6414 - bpo-44945: Specialize the BINARY_ADD instruction using the PEP 659
6423 - bpo-44929: Fix some edge cases of ``enum.Flag`` string representation in
6426 - bpo-44914: Class version tags are no longer recycled.
6432 - bpo-44698: Restore behaviour of complex exponentiation with integer-valued
6435 - bpo-44895: A debug variable :envvar:`PYTHONDUMPREFSFILE` is added for
6436   creating a dump file which is generated by :option:`--with-trace-refs`.
6437   Patch by Dong-hee Na.
6439 - bpo-44900: Add five superinstructions for PEP 659 quickening:
6447 - bpo-44889: Initial implementation of adaptive specialization of
6456 - bpo-44890: Specialization stats are always collected in debug builds.
6458 - bpo-44885: Correct the ast locations of f-strings with format specs and
6461 - bpo-44878: Remove the loop from the bytecode interpreter. All instructions
6462   end with a DISPATCH macro, so the loop is now redundant.
6464 - bpo-44878: Remove switch statement for interpreter loop when using
6468 - bpo-44874: Deprecate the old trashcan macros
6472 - bpo-44872: Use new trashcan macros (Py_TRASHCAN_BEGIN/END) in
6475 - bpo-33930: Fix segmentation fault with deep recursion when cleaning method
6478 - bpo-25782: Fix bug where ``PyErr_SetObject`` hangs when the current
6481 - bpo-44856: Fix reference leaks in the error paths of ``update_bases()``
6484 - bpo-44826: Initial implementation of adaptive specialization of STORE_ATTR
6494 - bpo-44838: Fixed a bug that was causing the parser to raise an incorrect
6498 - bpo-44821: Create instance dictionaries (__dict__) eagerly, to improve
6501 - bpo-44792: Improve syntax errors for if expressions. Patch by Miguel Brito
6503 - bpo-34013: Generalize the invalid legacy statement custom error message
6504   (like the one generated when "print" is called without parentheses) to
6507 - bpo-44732: Rename ``types.Union`` to ``types.UnionType``.
6509 - bpo-44725: Expose specialization stats in python via
6512 - bpo-44717: Improve AttributeError on circular imports of submodules.
6514 - bpo-44698: Fix undefined behaviour in complex object exponentiation.
6516 - bpo-44653: Support :mod:`typing` types in parameter substitution in the
6519 - bpo-44676: Add ability to serialise ``types.Union`` objects. Patch
6522 - bpo-44633: Parameter substitution of the union type with wrong types now
6525 - bpo-44661: Update ``property_descr_set`` to use vectorcall if possible.
6526   Patch by Dong-hee Na.
6528 - bpo-44662: Add ``__module__`` to ``types.Union``. This also fixes
6532 - bpo-44655: Include the name of the type in unset __slots__ attribute
6535 - bpo-44655: Don't include a missing attribute with the same name as the
6539 - bpo-44646: Fix the hash of the union type: it no longer depends on the
6542 - bpo-44636: Collapse union of equal types. E.g. the result of ``int | int``
6543   is now ``int``. Fix comparison of the union type with non-hashable
6546 - bpo-44611: On Windows, :func:`os.urandom`: uses BCryptGenRandom API
6547   instead of CryptGenRandom API which is deprecated from Microsoft Windows
6548   API. Patch by Dong-hee Na.
6550 - bpo-44635: Convert ``None`` to ``type(None)`` in the union type
6553 - bpo-26280: Implement adaptive specialization for BINARY_SUBSCR
6563 - bpo-44589: Mapping patterns in ``match`` statements with two or more equal
6564   literal keys will now raise a :exc:`SyntaxError` at compile-time.
6566 - bpo-44606: Fix ``__instancecheck__`` and ``__subclasscheck__`` for the
6569 - bpo-42073: The ``@classmethod`` decorator can now wrap other
6570   classmethod-like descriptors.
6572 - bpo-41972: Tuned the string-searching algorithm of fastsearch.h to have a
6575 - bpo-44590: All necessary data for executing a Python function (local
6576   variables, stack, etc) is now kept in a per-thread stack. Frame objects
6581 - bpo-44584: The threading debug (:envvar:`PYTHONTHREADDEBUG` environment
6582   variable) is deprecated in Python 3.10 and will be removed in Python 3.12.
6585 - bpo-43895: An obsolete internal cache of shared object file handles added
6587   dlopen'ed twice to work around flaws in mid-1990s posix-ish operating
6590 - bpo-44490: :mod:`typing` now searches for type parameters in
6595 - bpo-43950: Code objects can now provide the column information for
6596   instructions when available. This is levaraged during traceback printing
6602 - bpo-44562: Remove uses of :c:func:`PyObject_GC_Del` in error path when
6605 - bpo-41486: Fix a memory consumption and copying performance regression in
6609 - bpo-43908: Heap types with the :const:`Py_TPFLAGS_IMMUTABLETYPE` flag can
6611   possible for :ref:`static types <static-types>`.  Patch by Erlend E.
6614 - bpo-44553: Implement GC methods for ``types.Union`` to break reference
6617 - bpo-44490: Add ``__parameters__`` attribute and ``__getitem__`` operator
6620 - bpo-44523: Remove the pass-through for :func:`hash` of
6622   original referred object dies while the proxy is part of a hashable
6625 - bpo-44483: Fix a crash in ``types.Union`` objects when creating a union of
6628 - bpo-44486: Modules will always have a dictionary, even when created by
6631 - bpo-44472: Fix ltrace functionality when exceptions are raised. Patch by
6634 - bpo-12022: A :exc:`TypeError` is now raised instead of an
6639 - bpo-44297: Make sure that the line number is set when entering a
6643 - bpo-44456: Improve the syntax error when mixing positional and keyword
6646 - bpo-44409: Fix error location information for tokenizer errors raised on
6649 - bpo-44396: Fix a possible crash in the tokenizer when raising syntax
6652 - bpo-44376: Exact integer exponentiation (like ``i**2`` or ``pow(i, 2)``)
6653   with a small exponent is much faster, due to reducing overhead in such
6656 - bpo-44313: Directly imported objects and modules (through import and from
6661 - bpo-44338: Implement adaptive specialization for LOAD_GLOBAL
6669 - bpo-44368: Improve syntax errors for invalid "as" targets. Patch by Pablo
6672 - bpo-44349: Fix an edge case when displaying text from files with encoding
6675 - bpo-44337: Initial implementation of adaptive specialization of LOAD_ATTR
6687 - bpo-44335: Fix a regression when identifying incorrect characters in
6690 - bpo-43693: Computation of the offsets of cell variables is done in the
6692   and free variables, especially in the case where a variable is both an
6695 - bpo-44317: Improve tokenizer error with improved locations. Patch by Pablo
6698 - bpo-44304: Fix a crash in the :mod:`sqlite3` module that happened when the
6702 - bpo-44305: Improve error message for ``try`` blocks without ``except`` or
6705 - bpo-43413: Constructors of subclasses of some builtin classes (e.g.
6711 - bpo-43667: Improve Unicode support in non-UTF locales on Oracle Solaris.
6714 - bpo-43693: A new opcode MAKE_CELL has been added that effectively moves
6720 - bpo-44232: Fix a regression in :func:`type` when a metaclass raises an
6723   class is not the metaclass. Patch by Victor Stinner.
6725 - bpo-44201: Avoid side effects of checking for specialized syntax errors in
6729 - bpo-43693: ``PyCodeObject`` gained ``co_fastlocalnames`` and
6733 - bpo-44184: Fix a crash at Python exit when a deallocator function removes
6736 - bpo-44187: Implement quickening in the interpreter. This offers no
6737   advantages as yet, but is an enabler of future optimizations. See PEP 659
6740 - bpo-44180: The parser doesn't report generic syntax errors that happen in
6744 - bpo-44168: Fix error message in the parser involving keyword arguments
6747 - bpo-44156: String caches in ``compile.c`` are now subinterpreter
6750 - bpo-44143: Fixed a crash in the parser that manifest when raising
6754 - bpo-44032: Move 'fast' locals and other variables from the frame object to
6755   a per-thread datastack.
6757 - bpo-44114: Fix incorrect dictkeys_reversed and dictitems_reversed function
6760 - bpo-44110: Improve :func:`str.__getitem__` error message
6762 - bpo-26110: Add ``CALL_METHOD_KW`` opcode to speed up method calls with
6763   keyword arguments.  Idea originated from PyPy.  A side effect is executing
6764   ``CALL_METHOD`` is now branchless in the evaluation loop.
6766 - bpo-28307: Compiler now optimizes simple C-style formatting with literal
6768   f-string expressions.
6770 - bpo-43149: Correct the syntax error message regarding multiple exception
6773 - bpo-43822: The parser will prioritize tokenizer errors over custom syntax
6776 - bpo-40222: "Zero cost" exception handling.
6784 - bpo-43918: Document the signature and ``default`` argument in the
6787 - bpo-43833: Emit a deprecation warning if the numeric literal is
6788   immediately followed by one of keywords: and, else, for, if, in, is, or.
6789   Raise a syntax error with more informative message if it is immediately
6792 - bpo-43879: Add native_thread_id to PyThreadState. Patch by Gabriele N.
6795 - bpo-43693: Compute cell offsets relative to locals in compiler. Allows the
6796   interpreter to treats locals and cells a single array, which is slightly
6800 - bpo-17792: More accurate error messages for access of unbound locals or
6803 - bpo-28146: Fix a confusing error message in :func:`str.format`.
6805 - bpo-11105: When compiling :class:`ast.AST` objects with recursive
6809 - bpo-39091: Fix crash when using passing a non-exception to a generator's
6812 - bpo-33346: Asynchronous comprehensions are now allowed inside
6817 -------
6819 - bpo-45371: Fix clang rpath issue in :mod:`distutils`. The UnixCCompiler
6823 - bpo-45329: Fix freed memory access in :class:`pyexpat.xmlparser` when
6826 - bpo-41710: On Unix, if the ``sem_clockwait()`` function is available in
6832 - bpo-1596321: Fix the :func:`threading._shutdown` function when the
6836 - bpo-45274: Fix a race condition in the :meth:`Thread.join()
6838   function is interrupted by a signal and the signal handler raises an
6842 - bpo-21302: In Unix operating systems, :func:`time.sleep` now uses the
6843   ``nanosleep()`` function, if ``clock_nanosleep()`` is not available but
6844   ``nanosleep()`` is available. ``nanosleep()`` allows to sleep with
6847 - bpo-21302: On Windows, :func:`time.sleep` now uses a waitable timer which
6848   has a resolution of 100 nanoseconds (10\ :sup:`-7` seconds). Previously,
6849   it had a resolution of 1 millisecond (10\ :sup:`-3` seconds). Patch by
6852 - bpo-45238: Fix :meth:`unittest.IsolatedAsyncioTestCase.debug`: it runs now
6855 - bpo-36674: :meth:`unittest.TestCase.debug` raises now a
6859 - bpo-45235: Fix an issue where argparse would not preserve values in a
6862 - bpo-45183: Have zipimport.zipimporter.find_spec() not raise an exception
6866 - bpo-45234: Fixed a regression in :func:`~shutil.copyfile`,
6868   :exc:`FileNotFoundError` when source is a directory, which should raise
6871 - bpo-45228: Fix stack buffer overflow in parsing J1939 network address.
6873 - bpo-45225: use map function instead of genexpr in capwords.
6875 - bpo-42135: Fix typo: ``importlib.find_loader`` is really slated for
6880 - bpo-20524: Improves error messages on ``.format()`` operation for ``str``,
6884 - bpo-45168: Change :func:`dis.dis` output to omit op arg values that cannot
6886   Previously the oparg itself was repeated in the value field, which is not
6889 - bpo-21302: In Unix operating systems, :func:`time.sleep` now uses the
6893 - bpo-45173: Remove from the :mod:`configparser` module: the
6900 - bpo-44987: Pure ASCII strings are now normalized in constant time by
6901   :func:`unicodedata.normalize`. Patch by Dong-hee Na.
6903 - bpo-35474: Calling :func:`mimetypes.guess_all_extensions` with
6908 - bpo-45166: :func:`typing.get_type_hints` now works with
6911 - bpo-45162: Remove many old deprecated :mod:`unittest` features:
6918 - bpo-38371: Remove the deprecated ``split()`` method of
6921 - bpo-20499: Improve the speed and accuracy of statistics.pvariance().
6923 - bpo-45132: Remove :meth:`__getitem__` methods of
6929 - bpo-45129: Due to significant security concerns, the *reuse_address*
6931   Python 3.9, is now entirely removed. This is because of the behavior of
6936 - bpo-45124: The ``bdist_msi`` command, deprecated in Python 3.9, is now
6943 - bpo-30856: :class:`unittest.TestResult` methods
6951 - bpo-45034: Changes how error is formatted for ``struct.pack`` with ``'H'``
6955 - bpo-25894: :mod:`unittest` now always reports skipped and failed subtests
6957   verbose mode. Also the test description is now output for errors in test
6960 - bpo-45081: Fix issue when dataclasses that inherit from
6964 - bpo-45085: The ``binhex`` module, deprecated in Python 3.9, is now
6975 - bpo-40360: The :mod:`lib2to3` package is now deprecated and may not be
6979 - bpo-45075: Rename :meth:`traceback.StackSummary.format_frame` to
6985 - bpo-31299: Add option to completely drop frames from a traceback by
6989 - bpo-41620: :meth:`~unittest.TestCase.run` now always return a
6993 - bpo-45021: Fix a potential deadlock at shutdown of forked children when
6996 - bpo-43913: Fix bugs in cleaning up classes and modules in :mod:`unittest`:
6999 …:meth:`~unittest.TestCase.addClassCleanup` were not called if ``tearDownClass`` is set to ``None``.
7005 - bpo-45030: Fix integer overflow in pickling and copying the range
7008 - bpo-45001: Made email date parsing more robust against malformed input,
7009   namely a whitespace-only ``Date:`` header. Patch by Wouter Bolsterlee.
7011 - bpo-45010: Remove support of special method ``__div__`` in
7012   :mod:`unittest.mock`. It is not used in Python 3.
7014 - bpo-39218: Improve accuracy of variance calculations by using ``x*x``
7017 - bpo-43613: Improve the speed of :func:`gzip.compress` and
7021 - bpo-37596: Ensure that :class:`set` and :class:`frozenset` objects are
7024 - bpo-44019: A new function ``operator.call`` has been added, such that
7027 - bpo-42255: :class:`webbrowser.MacOSX` is deprecated and will be removed in
7028   Python 3.13. It is untested and undocumented and also not used by
7029   webbrowser itself. Patch by Dong-hee Na.
7031 - bpo-44955: Method :meth:`~unittest.TestResult.stopTestRun` is now always
7037 - bpo-39039: tarfile.open raises :exc:`~tarfile.ReadError` when a zlib error
7040 - bpo-44935: :mod:`subprocess` on Solaris now also uses
7043 - bpo-44911: :class:`~unittest.IsolatedAsyncioTestCase` will no longer throw
7046 - bpo-41322: Added ``DeprecationWarning`` for tests and async tests that
7050 - bpo-44524: Make exception message more useful when subclass from typing
7053 - bpo-38956: :class:`argparse.BooleanOptionalAction`'s default value is no
7057 - bpo-44860: Fix the ``posix_user`` scheme in :mod:`sysconfig` to not depend
7060 - bpo-44859: Improve error handling in :mod:`sqlite3` and raise more
7063 …* :exc:`MemoryError` is now raised instead of :exc:`sqlite3.Warning` when memory is not enough for…
7064 …* :exc:`UnicodEncodeError` is now raised instead of :exc:`sqlite3.Warning` when the statement cont…
7065 …* :exc:`TypeError` is now raised instead of :exc:`ValueError` for non-string script argument in ``…
7066 …* :exc:`ValueError` is now raised for script containing the null character instead of truncating i…
7070 - bpo-44581: Upgrade bundled pip to 21.2.3 and setuptools to 57.4.0
7072 - bpo-44849: Fix the :func:`os.set_inheritable` function on FreeBSD 14 for
7077 - bpo-44605: The @functools.total_ordering() decorator now works with
7080 - bpo-44524: Fixed an issue wherein the ``__name__`` and ``__qualname__``
7083 - bpo-44839: :class:`MemoryError` raised in user-defined functions will now
7088 - bpo-44822: :mod:`sqlite3` user-defined functions and aggregators returning
7092 - bpo-44801: Ensure that the :class:`~typing.ParamSpec` variable in Callable
7096 - bpo-44806: Non-protocol subclasses of :class:`typing.Protocol` ignore now
7099 - bpo-27275: :meth:`collections.OrderedDict.popitem` and
7103 - bpo-44793: Fix checking the number of arguments when subscribe a generic
7106 - bpo-44784: In importlib.metadata tests, override warnings behavior under
7109 - bpo-44667: The :func:`tokenize.tokenize` doesn't incorrectly generate a
7111   the last line is a comment, as the function is already generating a ``NL``
7114 - bpo-44771: Added ``importlib.simple`` module implementing adapters from a
7115   low-level resources reader interface to a ``TraversableResources``
7116   interface. Legacy API (``path``, ``contents``, ...) is now supported
7121 - bpo-44752: :mod:`rcompleter` does not call :func:`getattr` on
7122   :class:`property` objects to avoid the side-effect of  evaluating the
7125 - bpo-44747: Refactor usage of ``sys._getframe`` in ``typing`` module. Patch
7128 - bpo-42378: Fixes the issue with log file being overwritten when
7129   :class:`logging.FileHandler` is used in :mod:`atexit` with *filemode* set
7131   if the log stream is already closed due to shutdown of logging.
7133 - bpo-44720: ``weakref.proxy`` objects referencing non-iterators now raise
7137 - bpo-44704: The implementation of ``collections.abc.Set._hash()`` now
7140 - bpo-44666: Fixed issue in :func:`compileall.compile_file` when
7141   ``sys.stdout`` is redirected. Patch by Stefan Hölzl.
7143 - bpo-44688: :meth:`sqlite3.Connection.create_collation` now accepts
7144   non-ASCII collation names. Patch by Erlend E. Aasland.
7146 - bpo-44690: Adopt *binacii.a2b_base64*'s strict mode in *base64.b64decode*.
7148 - bpo-42854: Fixed a bug in the :mod:`_ssl` module that was throwing
7153 - bpo-44686: Replace ``unittest.mock._importer`` with
7156 - bpo-44353: Make ``NewType.__call__`` faster by implementing it in C. Patch
7159 - bpo-44682: Change the :mod:`pdb` *commands* directive to disallow setting
7162 - bpo-44353: Refactor ``typing.NewType`` from function into callable class.
7165 - bpo-44678: Added a separate error message for discontinuous padding in
7168 - bpo-44524: Add missing ``__name__`` and ``__qualname__`` attributes to
7171 - bpo-40897: Give priority to using the current class constructor in
7174 - bpo-44638: Add a reference to the zipp project and hint as to how to use
7177 - bpo-44648: Fixed wrong error being thrown by :func:`inspect.getsource`
7182 - bpo-44608: Fix memory leak in :func:`_tkinter._flatten` if it is called
7185 - bpo-44594: Fix an edge case of :class:`ExitStack` and
7187   block behavior when ``__context__`` is explicitly set to ``None`` when the
7188   exception is in flight.
7190 - bpo-42799: In :mod:`fnmatch`, the cache size for compiled regex patterns
7195 - bpo-41928: Update :func:`shutil.copyfile` to raise
7200 - bpo-44569: Added the :func:`StackSummary.format_frame` function in
7202   are formatted in tracebacks without re-implementing logic to handle
7205 - bpo-44566: handle StopIteration subclass raised from
7208 - bpo-44558: Make the implementation consistency of
7209   :func:`~operator.indexOf` between C and Python versions. Patch by Dong-hee
7212 - bpo-41249: Fixes ``TypedDict`` to work with ``typing.get_type_hints()``
7215 - bpo-44554: Refactor argument processing in :func:`pdb.main` to simplify
7219 - bpo-34798: Break up paragraph about :class:`pprint.PrettyPrinter`
7222 - bpo-44539: Added support for recognizing JPEG files without JFIF or Exif
7225 - bpo-44461: Fix bug with :mod:`pdb`'s handling of import error due to a
7228 - bpo-43625: Fix a bug in the detection of CSV file headers by
7231 - bpo-44516: Update vendored pip to 21.1.3
7233 - bpo-42892: Fixed an exception thrown while parsing a malformed multipart
7236 - bpo-44468: :func:`typing.get_type_hints` now finds annotations in classes
7240 - bpo-44491: Allow clearing the :mod:`sqlite3` authorizer callback by
7244 - bpo-43977: Set the proper :const:`Py_TPFLAGS_MAPPING` and
7249 - bpo-44482: Fix very unlikely resource leak in :mod:`glob` in alternate
7252 - bpo-44466: The :mod:`faulthandler` module now detects if a fatal error
7255 - bpo-44471: A :exc:`TypeError` is now raised instead of an
7261 - bpo-44404: :mod:`tkinter`'s ``after()`` method now supports callables
7264 - bpo-41546: Make :mod:`pprint` (like the builtin ``print``) not attempt to
7265   write to ``stdout`` when it is ``None``.
7267 - bpo-44458: ``BUFFER_BLOCK_SIZE`` is now declared static, to avoid linking
7270 - bpo-44464: Remove exception for flake8 in deprecated importlib.metadata
7273 - bpo-44446: Take into account that ``lineno`` might be ``None`` in
7276 - bpo-44439: Fix in :meth:`bz2.BZ2File.write` / :meth:`lzma.LZMAFile.write`
7277   methods, when the input data is an object that supports the buffer
7280 - bpo-44434: _thread.start_new_thread() no longer calls
7286 - bpo-42972: The _thread.RLock type now fully implement the GC protocol: add
7290 - bpo-44422: The :func:`threading.enumerate` function now uses a reentrant
7293 - bpo-38291: Importing typing.io or typing.re now prints a
7296 - bpo-37880: argparse actions store_const and append_const each receive a
7297   default value of None when the ``const`` kwarg is not provided.
7300 - bpo-44389: Fix deprecation of :data:`ssl.OP_NO_TLSv1_3`
7302 - bpo-27827: :meth:`pathlib.PureWindowsPath.is_reserved` now identifies a
7306 - bpo-44395: Fix :meth:`~email.message.MIMEPart.as_string` to pass unixfrom
7307   properly. Patch by Dong-hee Na.
7309 - bpo-34266: Handle exceptions from parsing the arg of :mod:`pdb`'s
7312 - bpo-44362: Improve :mod:`ssl` module's deprecation messages, error
7315 - bpo-44342: [Enum] Change pickling from by-value to by-name.
7317 - bpo-44356: [Enum] Allow multiple data-type mixins if they are all the
7320 - bpo-44351: Restore back :func:`parse_makefile` in
7324 - bpo-35800: :class:`smtpd.MailmanProxy` is now removed as it is unusable
7325   without an external module, ``mailman``. Patch by Dong-hee Na.
7327 - bpo-44357: Added a function that returns cube root of the given number
7330 - bpo-44339: Change ``math.pow(±0.0, -math.inf)`` to return ``inf`` instead
7331   of raising ``ValueError``. This brings the special-case handling of
7334 - bpo-44242: Remove missing flag check from Enum creation and move into a
7337 - bpo-44246: In ``importlib.metadata``, restore compatibility in the result
7341   ``sort()`` and other list-based mutation operations.   Avoid deprecation
7347 - bpo-44246: In importlib.metadata.entry_points, de-duplication of
7352 - bpo-43858: Added a function that returns a copy of a dict of logging
7355 - bpo-44260: The :class:`random.Random` constructor no longer reads system
7358 - bpo-44254: On Mac, give turtledemo button text a color that works on both
7361 - bpo-44258: Support PEP 515 for Fraction's initialization from string.
7363 - bpo-44235: Remove deprecated functions in the :mod:`gettext`. Patch by
7364   Dong-hee Na.
7366 - bpo-38693: Prefer f-strings to ``.format`` in importlib.resources.
7368 - bpo-33693: Importlib.metadata now prefers f-strings to .format.
7370 - bpo-44241: Incorporate minor tweaks from importlib_metadata 4.1:
7373 - bpo-43216: Remove the :func:`@asyncio.coroutine <asyncio.coroutine>`
7374   :term:`decorator` enabling legacy generator-based coroutines to be
7381 - bpo-44210: Make importlib.metadata._meta.PackageMetadata public.
7383 - bpo-43643: Declare readers.MultiplexedPath.name as a property per the
7386 - bpo-27334: The :mod:`sqlite3` context manager now performs a rollback
7390 - bpo-4928: Documented existing behavior on POSIX: NamedTemporaryFiles are
7391   not deleted when creating process is killed with SIGKILL
7393 - bpo-44154: Optimize :class:`fractions.Fraction` pickling for large
7396 - bpo-33433: For IPv4 mapped IPv6 addresses (:rfc:`4291` Section 2.5.5.2),
7397   the :mod:`ipaddress.IPv6Address.is_private` check is deferred to the
7398   mapped IPv4 address. This solves a bug where public mapped IPv4 addresses
7401 - bpo-44150: Add optional *weights* argument to statistics.fmean().
7403 - bpo-44142: :func:`ast.unparse` will now drop the redundant parentheses
7406 - bpo-44145: :mod:`hmac` computations were not releasing the GIL while
7411 - bpo-44095: :class:`zipfile.Path` now supports :attr:`zipfile.Path.stem`,
7414 - bpo-44077: It's now possible to receive the type of service (ToS), a.k.a.
7419 - bpo-37788: Fix a reference leak when a Thread object is never joined.
7421 - bpo-38908: Subclasses of ``typing.Protocol`` which only have data
7426 - bpo-44098: ``typing.ParamSpec`` will no longer be found in the
7432 - bpo-44089: Allow subclassing ``csv.Error`` in 3.10 (it was allowed in 3.9
7435 - bpo-44081: :func:`ast.unparse` now doesn't use redundant spaces to
7438 - bpo-44061: Fix regression in previous release when calling
7441 - bpo-44059: Register the SerenityOS Browser in the :mod:`webbrowser`
7444 - bpo-36515: The :mod:`hashlib` module no longer does unaligned memory
7447 - bpo-40465: Remove random module features deprecated in Python 3.9.
7449 - bpo-44018: random.seed() no longer mutates bytearray inputs.
7451 - bpo-38352: Add ``IO``, ``BinaryIO``, ``TextIO``, ``Match``, and
7454 - bpo-44002: :mod:`urllib.parse` now uses :func:`functool.lru_cache` for its
7458   The undocumented internal :mod:`urllib.parse` ``Quoted`` class API is now
7461 - bpo-43972: When :class:`http.server.SimpleHTTPRequestHandler` sends a
7463   a ``Content-Length: 0`` header. This improves the behavior for certain
7466 - bpo-28528: Fix a bug in :mod:`pdb` where :meth:`~pdb.Pdb.checkline` raises
7467   :exc:`AttributeError` if it is called after :meth:`~pdb.Pdb.reset`.
7469 - bpo-43853: Improved string handling for :mod:`sqlite3` user-defined
7472   * It is now possible to pass strings with embedded null characters to UDFs
7477 - bpo-43666: AIX: `Lib/_aix_support.get_platform()` may fail in an AIX WPAR.
7479   this fileset is queried rather than bos.mp64. To prevent a similar
7481   build is provided. Patch by M Felt.
7483 - bpo-43650: Fix :exc:`MemoryError` in :func:`shutil.unpack_archive` which
7487 - bpo-43612: :func:`zlib.compress` now accepts a wbits parameter which
7491   ``gzip.compress`` when wbits=31 is used.
7493 - bpo-43392: :func:`importlib._bootstrap._find_and_load` now implements a
7494   two-step check to avoid locking when modules have been already imported
7498 - bpo-43318: Fix a bug where :mod:`pdb` does not always echo cleared
7501 - bpo-43234: Prohibit passing
7502   non-:class:`concurrent.futures.ThreadPoolExecutor` executors to
7506 - bpo-43232: Prohibit previously deprecated potentially disruptive
7510 - bpo-30077: Added support for Apple's aifc/sowt pseudo-compression
7512 - bpo-42971: Add definition of ``errno.EQFULL`` for platforms that define
7515 - bpo-43086: Added a new optional :code:`strict_mode` parameter to
7516   *binascii.a2b_base64*. When :code:`scrict_mode` is set to :code:`True`,
7518   details about what "valid base64 content" is, can be found in the
7521 - bpo-43024: Improve the help signature of
7525 - bpo-33809: Add the :meth:`traceback.TracebackException.print` method which
7528 - bpo-42862: :mod:`sqlite3` now utilizes :meth:`functools.lru_cache` to
7533 - bpo-41818: Soumendra Ganguly: add termios.tcgetwinsize(),
7536 - bpo-40497: :meth:`subprocess.check_output` now raises :exc:`ValueError`
7537   when the invalid keyword argument *check* is passed by user code.
7541 - bpo-37449: ``ensurepip`` now uses ``importlib.resources.files()``
7544 - bpo-40956: Use Argument Clinic in :mod:`sqlite3`.  Patches by Erlend E.
7547 - bpo-41730: ``DeprecationWarning`` is now raised when importing
7551 - bpo-20684: Remove unused ``_signature_get_bound_param`` function from
7552   :mod:`inspect` - by Anthony Sottile.
7554 - bpo-41402: Fix :meth:`email.message.EmailMessage.set_content` when called
7557 - bpo-32695: The *compresslevel* and *preset* keyword arguments of
7560 - bpo-41137: Use utf-8 encoding while reading .pdbrc files. Patch by
7563 - bpo-24391: Improved reprs of :mod:`threading` synchronization objects:
7567 - bpo-5846: Deprecated the following :mod:`unittest` functions, scheduled
7582 - bpo-40563: Support pathlike objects on dbm/shelve. Patch by Hakan Çelik
7583   and Henry-Joseph Audéoud.
7585 - bpo-34990: Fixed a Y2k38 bug in the compileall module where it would fail
7588 - bpo-39549: Whereas the code for reprlib.Repr had previously used a
7593 - bpo-37022: :mod:`pdb` now displays exceptions from ``repr()`` with its
7596 - bpo-38840: Fix ``test___all__`` on platforms lacking a shared memory
7599 - bpo-39359: Add one missing check that the password is a bytes object for
7602 - bpo-38741: :mod:`configparser`: using ']' inside a section header will no
7605 - bpo-38415: Added missing behavior to
7610 - bpo-30256: Pass multiprocessing BaseProxy argument ``manager_owned``
7613 - bpo-27513: :func:`email.utils.getaddresses` now accepts
7617 - bpo-16379: Add SQLite error code and name to :mod:`sqlite3` exceptions.
7620 - bpo-26228: pty.spawn no longer hangs on FreeBSD, macOS, and Solaris.
7622 - bpo-33349: lib2to3 now recognizes async generators everywhere.
7624 - bpo-29298: Fix ``TypeError`` when required subparsers without ``dest`` do
7628 -------------
7630 - bpo-45216: Remove extra documentation listing methods in ``difflib``. It
7633 - bpo-45024: :mod:`collections.abc` documentation has been expanded to
7639 - bpo-44957: Promote PEP 604 union syntax by using it where possible. Also,
7643 - bpo-16580: Added code equivalents for the :meth:`int.to_bytes` and
7647 - bpo-44903: Removed the othergui.rst file, any references to it, and the
7652 - bpo-33479: Tkinter documentation has been greatly expanded with new
7655 - bpo-36700: :mod:`base64` RFC references were updated to point to
7659 - bpo-44740: Replaced occurrences of uppercase "Web" and "Internet" with
7662 - bpo-44693: Update the definition of __future__ in the glossary by
7663   replacing the confusing word "pseudo-module" with a more accurate
7666 - bpo-35183: Add typical examples to os.path.splitext docs
7668 - bpo-30511: Clarify that :func:`shutil.make_archive` is not thread-safe due
7671 - bpo-44561: Update of three expired hyperlinks in
7675 - bpo-44651: Delete entry "coercion" in Doc/glossary.rst for its outdated
7678 - bpo-42958: Updated the docstring and docs of :func:`filecmp.cmp` to be
7681 - bpo-44631: Refactored the ``repr()`` code of the ``_Environ`` (os module).
7683 - bpo-44613: importlib.metadata is no longer provisional.
7685 - bpo-44558: Match the docstring and python implementation of
7688 - bpo-44544: List all kwargs for :func:`textwrap.wrap`,
7693 - bpo-38062: Clarify that atexit uses equality comparisons internally.
7695 - bpo-40620: Convert examples in tutorial controlflow.rst section 4.3 to be
7696   interpreter-demo style.
7698 - bpo-43066: Added a warning to :mod:`zipfile` docs: filename arg with a
7699   leading slash may cause archive to be un-openable on Windows systems.
7701 - bpo-39452: Rewrote ``Doc/library/__main__.rst``. Broadened scope of the
7706 - bpo-13814: In the Design FAQ, answer "Why don't generators support the
7709 - bpo-27752: Documentation of csv.Dialect is more descriptive.
7711 - bpo-44453: Fix documentation for the return type of
7714 - bpo-44392: Added a new section in the C API documentation for types used
7718 - bpo-38291: Mark ``typing.io`` and ``typing.re`` as deprecated since Python
7722 - bpo-44322: Document that SyntaxError args have a details tuple and that
7723   details are adjusted for errors in f-string field replacement expressions.
7725 - bpo-42392: Document the deprecation and removal of the ``loop`` parameter
7728 - bpo-44195: Corrected references to ``TraversableResources`` in docs. There
7729   is no ``TraversableReader``.
7731 - bpo-41963: Document that ``ConfigParser`` strips off comments when reading
7734 - bpo-44072: Correct where in the numeric ABC hierarchy ``**`` support is
7737 - bpo-43558: Add the remark to :mod:`dataclasses` documentation that the
7741 - bpo-44025: Clarify when '_' in match statements is a keyword, and when
7744 - bpo-41706: Fix docs about how methods like ``__add__`` are invoked when
7747 - bpo-41621: Document that :class:`collections.defaultdict` parameter
7748   ``default_factory`` defaults to None and is positional-only.
7750 - bpo-41576: document BaseException in favor of bare except
7752 - bpo-21760: The description for __file__ fixed. Patch by Furkan Onder
7754 - bpo-39498: Add a "Security Considerations" index which links to standard
7757 - bpo-33479: Remove the unqualified claim that tkinter is threadsafe. It has
7759   what is true may be added later, after more discussion, and possibly after
7763 -----
7765 - bpo-40173: Fix :func:`test.support.import_helper.import_fresh_module`.
7767 - bpo-45280: Add a test case for empty :class:`typing.NamedTuple`.
7769 - bpo-45269: Cover case when invalid ``markers`` type is supplied to
7772 - bpo-45128: Fix ``test_multiprocessing_fork`` failure due to
7775 - bpo-45209: Fix ``UserWarning: resource_tracker`` warning in
7778 - bpo-45185: Enables ``TestEnumerations`` test cases in ``test_ssl`` suite.
7780 - bpo-45195: Fix test_readline.test_nonascii(): sometimes, the newline
7781   character is not written at the end, so don't expect it in the output.
7784 - bpo-45156: Fixes infinite loop on :func:`unittest.mock.seal` of mocks
7787 - bpo-45125: Improves pickling tests and docs of ``SharedMemory`` and
7790 - bpo-44860: Update ``test_sysconfig.test_user_similar()`` for the
7794 - bpo-45052: ``WithProcessesTestSharedMemory.test_shared_memory_basics``
7796   was failing. It is now removed and test is unskipped.
7798   The main motivation for this line to be removed from the test is that the
7799   ``size`` of ``SharedMemory`` is not ever guaranteed to be the same. It is
7802 - bpo-44895: libregrtest now clears the type cache later to reduce the risk
7808 - bpo-45042: Fixes that test classes decorated with
7811 - bpo-25130: Add calls of :func:`gc.collect` in tests to support PyPy.
7813 - bpo-45011: Made tests relying on the :mod:`_asyncio` C extension module
7817 - bpo-44949: Fix auto history tests of test_readline: sometimes, the newline
7818   character is not written at the end, so don't expect it in the output.
7820 - bpo-44891: Tests were added to clarify :func:`id` is preserved when ``obj
7821   * 1`` is used on :class:`str` and :class:`bytes` objects. Patch by Nikita
7824 - bpo-44852: Add ability to wholesale silence DeprecationWarnings while
7827 - bpo-40928: Notify users running test_decimal regression tests on macOS of
7831 - bpo-44734: Fixed floating point precision issue in turtle tests.
7833 - bpo-44708: Regression tests, when run with -w, are now re-running only the
7834   affected test methods instead of re-running the entire test file.
7836 - bpo-42095: Added interop tests for Apple plists: generate plist files with
7839 - bpo-44647: Added a permanent Unicode-valued environment variable to
7844 - bpo-44515: Adjust recently added contextlib tests to avoid assuming the
7847 - bpo-44287: Fix asyncio test_popen() of test_windows_utils by using a
7848   longer timeout. Use military grade battle-tested
7850   of 10 seconds: it's 30 seconds by default, but it is made longer on slow
7853 - bpo-44451: Reset ``DeprecationWarning`` filters in
7857 - bpo-44363: Account for address sanitizer in test_capi. test_capi now
7860 - bpo-44364: Add non integral tests for :func:`math.sqrt` function.
7862 - bpo-43921: Fix test_ssl.test_wrong_cert_tls13(): use
7866 - bpo-43921: Fix test_pha_required_nocert() of test_ssl: catch two more EOF
7870 - bpo-44131: Add test_frozenmain to test_embed to test the
7873 - bpo-31904: Ignore error string case in test_file_not_exists().
7875 - bpo-42083: Add test to check that ``PyStructSequence_NewType`` accepts a
7878 - bpo-35753: Fix crash in doctest when doctest parses modules that include
7881 - bpo-30256: Add test for nested queues when using ``multiprocessing``
7885 -----
7887 - bpo-45220: Avoid building with the Windows 11 SDK previews automatically.
7891 - bpo-45020: Freeze stdlib modules that are imported during startup.  This
7893   use the previously added "-X frozen_modules=off" commandline option to
7896 - bpo-45188: Windows builds now regenerate frozen modules as the first part
7900 - bpo-45163: Fixes Haiku platform build.
7902 - bpo-45067: The ncurses function extended_color_content was introduced in
7905   (https://invisible-island.net/ncurses/NEWS.html#index-t20170401).  The
7907   ncurses-devel package in CentOS 7 had a older version ncurses resulted in
7911 - bpo-45019: Generate lines in relevant files for frozen modules.  Up until
7915 - bpo-44340: Add support for building with clang thin lto via
7916   --with-lto=thin/full. Patch by Dong-hee Na and Brett Holman.
7918 - bpo-44535: Enable building using a Visual Studio 2022 install on Windows.
7920 - bpo-43298: Improved error message when building without a Windows SDK
7923 - bpo-44381: The Windows build now accepts :envvar:`EnableControlFlowGuard`
7926 - bpo-41282: Fix broken ``make install`` that caused standard library
7931 -------
7933 - bpo-45375: Fixes an assertion failure due to searching for the standard
7936 - bpo-45022: Update Windows release to include libffi 3.4.2
7938 - bpo-45007: Update to OpenSSL 1.1.1l in Windows build
7940 - bpo-44848: Upgrade Windows installer to use SQLite 3.36.0.
7942 - bpo-44572: Avoid consuming standard input in the :mod:`platform` module
7944 - bpo-44582: Accelerate speed of :mod:`mimetypes` initialization using a
7947 - bpo-41299: Fix 16 milliseconds jitter when using timeouts in
7951 - bpo-42686: Build :mod:`sqlite3` with math functions enabled. Patch by
7954 - bpo-40263: This is a follow-on bug from
7955   https://bugs.python.org/issue26903. Once that is applied we run into an
7956   off-by-one assertion problem. The assert was not correct.
7959 -----
7961 - bpo-45007: Update macOS installer builds to use OpenSSL 1.1.1l.
7963 - bpo-34602: When building CPython on macOS with ``./configure
7964   --with-undefined-behavior-sanitizer --with-pydebug``, the stack size is
7967 - bpo-44848: Update macOS installer to use SQLite 3.36.0.
7969 - bpo-44689: :meth:`ctypes.util.find_library` now works correctly on macOS
7970   11 Big Sur even if Python is built on an older version of macOS.
7975 - bpo-41972: The framework build's user header path in sysconfig is changed
7978 - bpo-43109: Allow --with-lto configure option to work with Apple-supplied
7981 - bpo-34932: Add socket.TCP_KEEPALIVE support for macOS. Patch by Shane
7985 ----
7987 - bpo-45296: On Windows, change exit/quit message to suggest Ctrl-D, which
7988   works, instead of <Ctrl-Z Return>, which does not work in IDLE.
7990 - bpo-45193: Make completion boxes appear on Ubuntu again.
7992 - bpo-40128: Mostly fix completions on macOS when not using tcl/tk 8.6.11
7996 - bpo-33962: Move the indent space setting from the Font tab to the new
7999 - bpo-40468: Split the settings dialog General tab into Windows and Shell/ED
8004 - bpo-41611: Avoid uncaught exceptions in
8007 - bpo-41611: Fix IDLE sometimes freezing upon tab-completion on macOS.
8009 - bpo-44010: Highlight the new :ref:`match <match>` statement's :ref:`soft
8010   keywords <soft-keywords>`: :keyword:`match`, :keyword:`case <match>`, and
8011   :keyword:`_ <wildcard-patterns>`. However, this highlighting is not
8012   perfect and will be incorrect in some rare cases, including some ``_``-s
8015 - bpo-44026: Include interpreter's typo fix suggestions in message line for
8019 -----------
8021 - bpo-44786: Fix a warning in regular expression in the c-analyzer script.
8023 - bpo-44967: pydoc now returns a non-zero status code when a module cannot
8026 - bpo-44978: Allow the Argument Clinic tool to handle ``__complex__``
8029 - bpo-43425: Removed the 'test2to3' demo project that demonstrated using
8031   distutils package. Patch by Dong-hee Na
8033 - bpo-44074: Make patchcheck automatically detect the correct base branch
8036 - bpo-20291: Added support for variadic positional parameters in Argument
8040 -----
8042 - bpo-41710: The PyThread_acquire_lock_timed() function now clamps the
8043   timeout if it is too large, rather than aborting the process. Patch by
8046 - bpo-44687: :meth:`BufferedReader.peek` no longer raises :exc:`ValueError`
8049 - bpo-45116: Add the :c:macro:`Py_ALWAYS_INLINE` macro to ask the compiler
8053 - bpo-45094: Add the :c:macro:`Py_NO_INLINE` macro to disable inlining on a
8056 - bpo-45061: Add a deallocator to the :class:`bool` type to detect refcount
8060 - bpo-42035: Add a new :c:func:`PyType_GetQualName` function to get type's
8063 - bpo-41103: Reverts removal of the old buffer protocol because they are
8066 - bpo-44751: Remove ``crypt.h`` include from the public ``Python.h`` header.
8068 - bpo-42747: The ``Py_TPFLAGS_HAVE_VERSION_TAG`` type flag now does nothing.
8069   The ``Py_TPFLAGS_HAVE_AM_SEND`` flag (which was added in 3.10) is removed.
8070   Both were unnecessary because it is not possible to have type objects with
8073 - bpo-44530: Added the ``co_qualname`` to the ``PyCodeObject`` structure to
8078 - bpo-44441: :c:func:`Py_RunMain` now resets :c:data:`PyImport_Inittab` to
8083 - bpo-39947: Remove 4 private trashcan C API functions which were only kept
8098   ``_tstate->trash_delete_nesting``, whereas the :c:type:`PyThreadState`
8099   structure is opaque in the limited C API.
8105 - bpo-40939: Removed documentation for the removed ``PyParser_*`` C API.
8107 - bpo-43795: The list in :ref:`stable-abi-list` now shows the public name
8108   :c:struct:`PyFrameObject` rather than ``_frame``. The non-existing entry
8111 - bpo-44378: :c:func:`Py_IS_TYPE` no longer uses :c:func:`Py_TYPE` to avoid
8115 - bpo-39573: Convert the :c:func:`Py_TYPE` and :c:func:`Py_SIZE` macros to
8120 - bpo-44263: The :c:func:`PyType_Ready` function now raises an error if a
8121   type is defined with the :const:`Py_TPFLAGS_HAVE_GC` flag set but has no
8125 - bpo-43795: The undocumented function :c:func:`Py_FrozenMain` is removed
8128 - bpo-44113: Deprecate the following functions to configure the Python
8142   Configuration <init-config>` instead (:pep:`587`).
8144 - bpo-44094: Remove ``PyErr_SetFromErrnoWithUnicodeFilename()``,
8149 - bpo-43795: :c:func:`PyCodec_Unregister` is now properly exported as a
8152 - bpo-44029: Remove deprecated ``Py_UNICODE`` APIs: ``PyUnicode_Encode``,
8162 - bpo-42035: Add a new :c:func:`PyType_GetName` function to get type's short
8169 *Release date: 2021-05-03*
8172 --------
8174 - bpo-43434: Creating :class:`sqlite3.Connection` objects now also produces
8179 - bpo-43998: The :mod:`ssl` module sets more secure cipher suites defaults.
8180   Ciphers without forward secrecy and with SHA-1 MAC are disabled by
8186 - bpo-43882: The presence of newline or tab characters in parts of a URL
8193 - bpo-43472: Ensures interpreter-level audit hooks receive the
8197 - bpo-43362: Fix invalid free in _sha3 module. The issue was introduced in
8200 - bpo-43762: Add audit events for :func:`sqlite3.connect/handle`,
8204 - bpo-43756: Add new audit event ``glob.glob/2`` to incorporate the new
8208 - bpo-36384: :mod:`ipaddress` module no longer accepts any leading zeros in
8209   IPv4 address strings. Leading zeros are ambiguous and interpreted as octal
8216 - bpo-43075: Fix Regular Expression Denial of Service (ReDoS) vulnerability
8217   in :class:`urllib.request.AbstractBasicAuthHandler`.  The ReDoS-vulnerable
8218   regex has quadratic worst-case complexity and it allows cause a denial of
8219   service when identifying crafted invalid RFCs. This ReDoS issue is on the
8222 - bpo-42800: Audit hooks are now fired for frame.f_code, traceback.tb_frame,
8225 - bpo-37363: Add audit events to the :mod:`http.client` module.
8228 -----------------
8230 - bpo-43977: Prevent classes being both a sequence and a mapping when
8233 - bpo-43977: Use :c:member:`~PyTypeObject.tp_flags` on the class object to
8234   determine if the subject is a sequence or mapping when pattern matching.
8237 - bpo-43892: Restore proper validation of complex literal value patterns
8240 - bpo-43933: Set frame.f_lineno to the line number of the 'with' kweyword
8243 - bpo-43933: If the current position in a frame has no line number then set
8244   the f_lineno attribute to None, instead of -1, to conform to PEP 626. This
8248 - bpo-43963: Importing the :mod:`_signal` module in a subinterpreter has no
8251 - bpo-42739: The internal representation of line number tables is changed to
8252   not use sentinels, and an explicit length parameter is added to the out of
8256 - bpo-43908: Make :mod:`re` types immutable. Patch by Erlend E. Aasland.
8258 - bpo-43908: Make the :class:`array.array` type immutable. Patch by Erlend
8261 - bpo-43901: Change class and module objects to lazy-create empty
8265 - bpo-43892: Match patterns now use new dedicated AST nodes (``MatchValue``,
8271 - bpo-42725: Usage of ``await``/``yield``/``yield from`` and named
8272   expressions within an annotation is now forbidden when PEP 563 is
8275 - bpo-43754: When performing structural pattern matching (:pep:`634`),
8279 - bpo-42737: Annotations for complex targets (everything beside simple
8283 - bpo-43914: :exc:`SyntaxError` exceptions raised by the interpreter will
8285   syntax error itself, instead of just where the problem is detected. Patch
8288 - bpo-38605: Revert making ``from __future__ import annotations`` the
8292 …https://mail.python.org/archives/list/python-dev@python.org/thread/CLVXXPQ2T2LQ5MP2Y53VVQFCXYWQJHK…
8295 - bpo-43475: Hashes of NaN values now depend on object identity.  Formerly,
8297   another.  Having the same hash for unequal values caused pile-ups in hash
8300 - bpo-43859: Improve the error message for :exc:`IndentationError`
8303 - bpo-41323: Constant tuple folding in bytecode optimizer now reuses tuple
8306 - bpo-43846: Data stack usage is much reduced for large literal and call
8309 - bpo-38530: When printing :exc:`NameError` raised by the interpreter,
8313 - bpo-43823: Improve syntax errors for invalid dictionary literals. Patch by
8316 - bpo-43822: Improve syntax errors in the parser for missing commas between
8319 - bpo-43798: :class:`ast.alias` nodes now include source location metadata
8322 - bpo-43797: Improve ``SyntaxError`` error messages for invalid comparisons.
8325 - bpo-43760: Move the flag for checking whether tracing is enabled to the C
8328 - bpo-43682: Static methods (:func:`@staticmethod <staticmethod>`) and class
8334 - bpo-43751: Fixed a bug where ``anext(ait, default)`` would erroneously
8337 - bpo-42128: :data:`~object.__match_args__` is no longer allowed to be a
8340 - bpo-43683: Add GEN_START opcode. Marks start of generator, including
8344 - bpo-43105: Importlib now resolves relative paths when creating module spec
8347 - bpo-43682: Static methods (:func:`@staticmethod <staticmethod>`) are now
8350 - bpo-42609: Prevented crashes in the AST validator and optimizer when
8352   :exc:`RecursionError` is now raised instead.
8354 - bpo-38530: When printing :exc:`AttributeError`, :c:func:`PyErr_Display`
8359 -------
8361 - bpo-44015: In @dataclass(), raise a TypeError if KW_ONLY is specified more
8364 - bpo-25478: Added a *total()* method to collections.Counter() to compute
8367 - bpo-43733: Change :class:`netrc.netrc` to use UTF-8 encoding before using
8370 - bpo-43979: Removed an unnecessary list comprehension before looping from
8371   :func:`urllib.parse.parse_qsl`.  Patch by Christoph Zwerschke and Dong-hee
8374 - bpo-43993: Update bundled pip to 21.1.1.
8376 - bpo-43957: [Enum] Deprecate ``TypeError`` when non-member is used in a
8378   and containment will return ``True`` if the value is either a member of
8381 - bpo-42904: For backwards compatibility with previous minor versions of
8387 - bpo-43945: [Enum] Deprecate non-standard mixin format() behavior: in 3.12
8390 - bpo-41139: Deprecate undocumented ``cgi.log()`` API.
8392 - bpo-43937: Fixed the :mod:`turtle` module working with non-default root
8395 - bpo-43930: Update bundled pip to 21.1 and setuptools to 56.0.0
8397 - bpo-43907: Fix a bug in the pure-Python pickle implementation when using
8402 - bpo-43926: In ``importlib.metadata``, provide a uniform interface to
8405   property for easy access to the PEP 566 JSON-compatible form. Sync with
8408 - bpo-43920: OpenSSL 3.0.0: :meth:`~ssl.SSLContext.load_verify_locations`
8412 - bpo-43607: :mod:`urllib` can now convert Windows paths with ``\\?\``
8415 - bpo-43817: Add :func:`inspect.get_annotations`, which safely computes the
8419   can also correctly un-stringize stringized annotations.
8424   :func:`inspect.from_callable` can now un-stringize stringized annotations,
8427 - bpo-43284: platform.win32_ver derives the windows version from
8434 - bpo-42854: The :mod:`ssl` module now uses ``SSL_read_ex`` and
8436   data larger than 2 GB. Writing zero-length data no longer fails with a
8439 - bpo-42333: Port ``_ssl`` extension module to multiphase initialization.
8441 - bpo-43880: :mod:`ssl` now raises DeprecationWarning for OP_NO_SSL/TLS*
8445 - bpo-41559: :pep:`612` is now implemented purely in Python; builtin
8452 - bpo-43867: The :mod:`multiprocessing` ``Server`` class now explicitly
8457 - bpo-40443: Remove unused imports: pyclbr no longer uses copy, and typing
8460 - bpo-43820: Remove an unneeded copy of the namespace passed to
8463 - bpo-43787: Add ``__iter__()`` method to :class:`bz2.BZ2File`,
8467 - bpo-43680: Deprecate io.OpenWrapper and _pyio.OpenWrapper: use io.open and
8470   set to a class variable. _io.open is a built-in function whereas
8471   _pyio.open is a Python function. In Python 3.10, _pyio.open() is now a
8472   static method, and builtins.open() is now io.open().
8474 - bpo-43680: The Python :func:`_pyio.open` function becomes a static method
8475   to behave as :func:`io.open` built-in function: don't become a bound
8481 - bpo-41515: Fix :exc:`KeyError` raised in :func:`typing.get_type_hints` due
8484 - bpo-43776: When :class:`subprocess.Popen` args are provided as a string or
8488 - bpo-42248: [Enum] ensure exceptions raised in ``_missing__`` are released
8490 - bpo-43744: fix issue with enum member name matching the start of a private
8493 - bpo-43772: Fixed the return value of ``TypeVar.__ror__``. Patch by Jelle
8496 - bpo-43764: Add match_args parameter to @dataclass decorator to allow
8499 - bpo-43799: OpenSSL 3.0.0: define ``OPENSSL_API_COMPAT`` 1.1.1 to suppress
8502 - bpo-43478: Mocks can no longer be used as the specs for other Mocks. As a
8503   result, an already-mocked object cannot have an attribute mocked using
8505   This can uncover bugs in tests since these Mock-derived Mocks will always
8509 - bpo-43794: Add :data:`ssl.OP_IGNORE_UNEXPECTED_EOF` constants (OpenSSL
8512 - bpo-43785: Improve ``bz2.BZ2File`` performance by removing the RLock from
8517 - bpo-43789: OpenSSL 3.0.0: Don't call the password callback function a
8518   second time when first call has signaled an error condition.
8520 - bpo-43788: The header files for :mod:`ssl` error codes are now OpenSSL
8521   version-specific. Exceptions will now show correct reason and library
8525 - bpo-43766: Implement :pep:`647` in the :mod:`typing` module by adding
8528 - bpo-25264: :func:`os.path.realpath` now accepts a *strict* keyword-only
8529   argument. When set to ``True``, :exc:`OSError` is raised if a path doesn't
8530   exist or a symlink loop is encountered.
8532 - bpo-43780: In ``importlib.metadata``, incorporate changes from
8533   importlib_metadata 3.10: Add mtime-based caching during distribution
8537 - The ``P.args`` and ``P.kwargs`` attributes of :class:`typing.ParamSpec`
8542 - bpo-43731: Add an ``encoding`` parameter :func:`logging.fileConfig()`.
8544 - bpo-43712: Add ``encoding`` and ``errors`` parameters to
8547 - bpo-38659: A ``simple_enum`` decorator is added to the ``enum`` module to
8552 - bpo-43764: Fix an issue where :data:`~object.__match_args__` generation
8555 - bpo-43752: Fix :mod:`sqlite3` regression for zero-sized blobs with
8559 - bpo-43655: :mod:`tkinter` dialog windows are now recognized as dialogs by
8562 - bpo-43723: The following ``threading`` methods are now deprecated and
8565   - ``currentThread`` => :func:`threading.current_thread`
8567   - ``activeCount`` => :func:`threading.active_count`
8569   - ``Condition.notifyAll`` => :meth:`threading.Condition.notify_all`
8571   - ``Event.isSet`` => :meth:`threading.Event.is_set`
8573   - ``Thread.setName`` => :attr:`threading.Thread.name`
8575   - ``thread.getName`` => :attr:`threading.Thread.name`
8577   - ``Thread.isDaemon`` => :attr:`threading.Thread.daemon`
8579   - ``Thread.setDaemon`` => :attr:`threading.Thread.daemon`
8583 - bpo-2135: Deprecate find_module() and find_loader() implementations in
8586 - bpo-43534: :func:`turtle.textinput` and :func:`turtle.numinput` create now
8589 - bpo-43532: Add the ability to specify keyword-only fields to dataclasses.
8590   These fields will become keyword-only arguments to the generated __init__.
8592 - bpo-43522: Fix problem with
8596 - bpo-8978: Improve error message for :func:`tarfile.open` when :mod:`lzma`
8599 - bpo-42967: Allow :class:`bytes` ``separator`` argument in
8603 - bpo-43296: Improve :mod:`sqlite3` error handling: ``sqlite3_value_blob()``
8607 - bpo-43312: New functions :func:`sysconfig.get_preferred_scheme` and
8611 - bpo-43265: Improve :meth:`sqlite3.Connection.backup` error handling. The
8612   error message for non-existent target database names is now ``unknown
8616 - bpo-41282: Install schemes in :mod:`distutils.command.install` are now
8619 - bpo-41282: :mod:`distutils.sysconfig` has been merged to :mod:`sysconfig`.
8621 - bpo-43176: Fixed processing of a dataclass that inherits from a frozen
8622   dataclass with no fields.  It is now correctly detected as an error.
8624 - bpo-43080: :mod:`pprint` now has support for
8627 - bpo-39950: Add `pathlib.Path.hardlink_to()` method that supersedes
8630 - bpo-42904: :func:`typing.get_type_hints` now checks the local namespace of
8633 - bpo-42269: Add ``slots`` parameter to ``dataclasses.dataclass`` decorator
8637 - bpo-39529: Deprecated use of :func:`asyncio.get_event_loop` without
8640   :class:`~asyncio.Task` objects if there is no running event loop and no
8641   explicit *loop* argument is passed: :func:`~asyncio.ensure_future`,
8647 - bpo-18369: Certificate and PrivateKey classes were added to the ssl
8650 - bpo-41486: Use a new output buffer management code for :mod:`bz2` /
8655 - bpo-31870: The :func:`ssl.get_server_certificate` function now has a
8658 - bpo-41735: Fix thread locks in zlib module may go wrong in rare case.
8661 - bpo-36470: Fix dataclasses with ``InitVar``\s and
8664 - bpo-40849: Expose X509_V_FLAG_PARTIAL_CHAIN ssl flag
8666 - bpo-35114: :func:`ssl.RAND_status` now returns a boolean value (as
8669 - bpo-39906: :meth:`pathlib.Path.stat` and :meth:`~pathlib.Path.chmod` now
8670   accept a *follow_symlinks* keyword-only argument for consistency with
8673 - bpo-39899: :func:`os.path.expanduser()` now refuses to guess Windows home
8682 - bpo-36076: Added SNI support to :func:`ssl.get_server_certificate`.
8684 - bpo-38490: Covariance, Pearson's correlation, and simple linear regression
8687 - bpo-33731: Provide a locale.localize() function, which converts a
8690 - bpo-32745: Fix a regression in the handling of ctypes'
8695 -------------
8697 - bpo-43987: Add "Annotations Best Practices" document as a new HOWTO.
8699 - bpo-43977: Document the new :const:`Py_TPFLAGS_MAPPING` and
8702 - bpo-43959: The documentation on the PyContextVar C-API was clarified.
8704 - bpo-43938: Update dataclasses documentation to express that
8705   FrozenInstanceError is derived from AttributeError.
8707 - bpo-43778: Fix the Sphinx glossary_search extension: create the _static/
8708   sub-directory if it doesn't exist.
8710 - bpo-43755: Update documentation to reflect that unparenthesized lambda
8714 - bpo-43739: Fixing the example code in Doc/extending/extending.rst to
8718 -----
8720 - bpo-43961: Fix test_logging.test_namer_rotator_inheritance() on Windows:
8724 - bpo-43842: Fix a race condition in the SMTP test of test_logging. Don't
8726   asyncore.loop() is polling the file descriptor. Patch by Victor Stinner.
8728 - bpo-43843: :mod:`test.libregrtest` now marks a test as ENV_CHANGED
8731   ``--fail-env-changed`` option to mark the test as failed. Patch by Victor
8734 - bpo-43811: Tests multiple OpenSSL versions on GitHub Actions. Use ccache
8737 - bpo-43791: OpenSSL 3.0.0: Disable testing of legacy protocols TLS 1.0 and
8741 -----
8743 - bpo-43567: Improved generated code refresh (AST/tokens/opcodes/keywords)
8746 - bpo-43669: Implement :pep:`644`. Python now requires OpenSSL 1.1.1 or
8750 -------
8752 - bpo-35306: Adds additional arguments to :func:`os.startfile` function.
8754 - bpo-43538: Avoid raising errors from :meth:`pathlib.Path.exists()` when
8757 - bpo-38822: Fixed :func:`os.stat` failing on inaccessible directories with
8762 - bpo-26227: Fixed decoding of host names in :func:`socket.gethostbyaddr`
8765 - bpo-40432: Updated pegen regeneration script on Windows to find and use
8769 - bpo-43745: Actually updates Windows release to OpenSSL 1.1.1k. Earlier
8772 - bpo-43652: Update Tcl and Tk to 8.6.11 in Windows installer.
8774 - bpo-43492: Upgrade Windows installer to use SQLite 3.35.5.
8776 - bpo-30555: Fix ``WindowsConsoleIO`` errors in the presence of fd
8780 -----
8782 - bpo-42119: Fix check for macOS SDK paths when building Python. Narrow
8790 - bpo-43568: Drop support for MACOSX_DEPLOYMENT_TARGET < 10.3
8792 - bpo-44009: Provide "python3.x-intel64" executable to allow reliably
8793   forcing macOS universal2 framework builds to run under Rosetta 2 Intel-64
8797 - bpo-43851: Build SQLite with ``SQLITE_OMIT_AUTOINIT`` on macOS. Patch by
8800 - bpo-43492: Update macOS installer to use SQLite 3.35.4.
8802 - bpo-42235: ``Mac/BuildScript/build-installer.py`` will now use
8803   "--enable-optimizations" and ``--with-lto`` when building on macOS 10.15
8807 ----
8809 - bpo-37903: Add mouse actions to the shell sidebar.  Left click and
8815 - bpo-43981: Fix reference leak in test_sidebar and test_squeezer. Patches
8818 - bpo-37892: Indent IDLE Shell input with spaces instead of tabs
8820 - bpo-43655: IDLE dialog windows are now recognized as dialogs by window
8823 - bpo-37903: IDLE's shell now shows prompts in a separate side-bar.
8826 -----
8828 - bpo-43916: Add a new :c:data:`Py_TPFLAGS_DISALLOW_INSTANTIATION` type flag
8831 - bpo-43774: Remove the now unused ``PYMALLOC_DEBUG`` macro. Debug hooks on
8832   memory allocators are now installed by default if Python is built in debug
8833   mode (if ``Py_DEBUG`` macro is defined). Moreover, they can now be used on
8837 - bpo-43962: _PyInterpreterState_IDIncref() now calls
8843 - bpo-28254: Add new C-API functions to control the state of the garbage
8848 - bpo-43908: Introduce :const:`Py_TPFLAGS_IMMUTABLETYPE` flag for immutable
8852 - bpo-43795: :c:func:`PyMem_Calloc` is now available in the limited C API
8855 - bpo-43868: :c:func:`PyOS_ReadlineFunctionPointer` is no longer exported by
8857   that takes ``FILE*``, it is not part of the stable ABI.
8859 - bpo-43795: Stable ABI and limited API definitions are generated from a
8862 - bpo-43753: Add the :c:func:`Py_Is(x, y) <Py_Is>` function to test if the
8863   *x* object is the *y* object, the same as ``x is y`` in Python. Add also
8865   functions to test if an object is, respectively, the ``None`` singleton,
8873 *Release date: 2021-04-05*
8876 --------
8878 - bpo-42988: CVE-2021-3426: Remove the ``getfile`` feature of the
8884 - bpo-43285: :mod:`ftplib` no longer trusts the IP address value returned
8886   a malicious FTP server from using the response to probe IPv4 address and
8891   instances to ``True`` to re-enable it.
8893 - bpo-43439: Add audit hooks for :func:`gc.get_objects`,
8898 -----------------
8900 - bpo-27129: Update CPython bytecode magic number.
8902 - bpo-43672: Raise ImportWarning when calling find_loader().
8904 - bpo-43660: Fix crash that happens when replacing ``sys.stderr`` with a
8905   callable that can remove the object while an exception is being printed.
8908 - bpo-27129: The bytecode interpreter uses instruction, rather byte, offsets
8912 - bpo-40645: Fix reference leak in the :mod:`_hashopenssl` extension. Patch
8915 - bpo-42134: Calls to find_module() by the import system now raise
8918 - bpo-41064: Improve the syntax error for invalid usage of double starred
8919   elements ('**') in f-strings. Patch by Pablo Galindo.
8921 - bpo-43575: Speed up calls to ``map()`` by using the :pep:`590`
8922   ``vectorcall`` calling convention. Patch by Dong-hee Na.
8924 - bpo-42137: The import system now prefers using ``__spec__`` for
8927 - bpo-43452: Added micro-optimizations to ``_PyType_Lookup()`` to improve
8930 - bpo-43555: Report the column offset for :exc:`SyntaxError` for invalid
8933 - bpo-43517: Fix misdetection of circular imports when using ``from pkg.mod
8934   import attr``, which caused false positives in non-trivial multi-threaded
8937 - bpo-43497: Emit SyntaxWarnings for assertions with tuple constants, this
8938   is a regression introduced in python3.7
8940 - bpo-39316: Tracing now has correct line numbers for attribute accesses
8941   when the attribute is on a different line from the object. Improves
8942   debugging and profiling for multi-line method chains.
8944 - bpo-35883: Python no longer fails at startup with a fatal error if a
8949 - bpo-43410: Fix a bug that was causing the parser to crash when emitting
8952 - bpo-43406: Fix a possible race condition where ``PyErr_CheckSignals``
8953   tries to execute a non-Python signal handler.
8955 - bpo-42128: Add ``__match_args__`` to :c:type:`structsequence` based
8958 - bpo-43390: CPython now sets the ``SA_ONSTACK`` flag in ``PyOS_setsig`` for
8959   the VM's default signal handlers.  This is friendlier to other in-process
8962   has been used to provide for signal handlers.  This is a no-op change for
8965 - bpo-43287: Speed up calls to ``filter()`` by using the :pep:`590`
8966   ``vectorcall`` calling convention. Patch by Dong-hee Na.
8968 - bpo-37448: Add a radix tree based memory map to track in-use obmalloc
8972   significantly higher percentage of requests from its ultra-fast paths.
8980   `-DWITH_PYMALLOC_RADIX_TREE=0`.
8982   Co-authored-by: Tim Peters <tim.peters@gmail.com>
8984 - bpo-29988: Only handle asynchronous exceptions and requests to drop the
8986   that :meth:`__exit__` is always called in with statements, even for
8990 -------
8992 - bpo-43720: Document various stdlib deprecations in imp, pkgutil, and
8995 - bpo-43433: :class:`xmlrpc.client.ServerProxy` no longer ignores query and
8998 - bpo-31956: The :meth:`~array.array.index` method of :class:`array.array`
9001 - bpo-40066: Enum: adjust ``repr()`` to show only enum and member name (not
9005 - bpo-42136: Deprecate all module_repr() methods found in importlib as their
9006   use is being phased out by Python 3.12.
9008 - bpo-35930: Raising an exception raised in a "future" instance will create
9011 - bpo-41369: Finish updating the vendored libmpdec to version 2.5.1.  Patch
9014 - bpo-43422: Revert the _decimal C API which was added in bpo-41324.
9016 - bpo-43577: Fix deadlock when using :class:`ssl.SSLContext` debug callback
9019 - bpo-43571: It's now possible to create MPTCP sockets with IPPROTO_MPTCP
9021 - bpo-43542: ``image/heic`` and ``image/heif`` were added to
9024 - bpo-40645: The :mod:`hmac` module now uses OpenSSL's HMAC implementation
9025   when digestmod argument is a hash name or builtin hash function.
9027 - bpo-43510: Implement :pep:`597`: Add ``EncodingWarning`` warning, ``-X
9031 - bpo-43521: ``ast.unparse`` can now render NaNs and empty sets.
9033 - bpo-42914: :func:`pprint.pprint` gains a new boolean
9038 - bpo-41361: :meth:`~collections.deque.rotate` calls are now slightly faster
9041 - bpo-43423: :func:`subprocess.communicate` no longer raises an IndexError
9042   when there is an empty stdout or stderr IO buffer during a timeout on
9045 - bpo-27820: Fixed long-standing bug of smtplib.SMTP where doing AUTH LOGIN
9048   The cause is that SMTP.auth_login _always_ returns a password if provided
9049   with a challenge string, thus non-compliant with the standard for AUTH
9054 - bpo-43445: Add frozen modules to :data:`sys.stdlib_module_names`. For
9058 - bpo-43245: Add keyword arguments support to ``ChainMap.new_child()``.
9060 - bpo-29982: Add optional parameter *ignore_cleanup_errors* to
9064 - bpo-43428: Include changes from `importlib_metadata 3.7
9065   <https://importlib-metadata.readthedocs.io/en/latest/history.html#v3-7-0>`_:
9076   is likely to be deprecated in the future.
9081 - bpo-43332: Improves the networking efficiency of :mod:`http.client` when
9085 - bpo-43420: Improve performance of :class:`fractions.Fraction` arithmetics
9088 - bpo-43356: Allow passing a signal number to ``_thread.interrupt_main()``.
9090 - bpo-43399: Fix ``ElementTree.extend`` not working on iterators when using
9093 - bpo-43369: Improve :mod:`sqlite3` error handling: If
9095   ``SQLITE_NOMEM``, :exc:`MemoryError` is now raised. Patch by Erlend E.
9098 - bpo-43368: Fix a regression introduced in PR 24562, where an empty
9102 - bpo-41282: Fixed stacklevel of ``DeprecationWarning`` emitted from
9105 - bpo-42129: ``importlib.resources`` now honors namespace packages, merging
9110 - bpo-43295: :meth:`datetime.datetime.strptime` now raises ``ValueError``
9114 - bpo-43125: Return empty string if base64mime.body_encode receive empty
9117 - bpo-43084: :func:`curses.window.enclose` returns now ``True`` or ``False``
9120 - bpo-42994: Add MIME types for opus, AAC, 3gpp and 3gpp2
9122 - bpo-14678: Add an invalidate_caches() method to the zipimport.zipimporter
9125 - bpo-42782: Fail fast in :func:`shutil.move()` to avoid creating
9128 - bpo-40066: Enum's `repr()` and `str()` have changed: `repr()` is now
9129   *EnumClass.MemberName* and `str()` is *MemberName*.  Additionally, stdlib
9134 - bpo-26053: Fixed bug where the :mod:`pdb` interactive run command echoed
9138 - bpo-24160: Fixed bug where breakpoints did not persist across multiple
9141 - bpo-40701: When the :data:`tempfile.tempdir` global variable is set to a
9142   value of type bytes, it is now handled consistently.  Previously
9148 - bpo-39342: Expose ``X509_V_FLAG_ALLOW_PROXY_CERTS`` as
9151   https://www.openssl.org/docs/man1.1.1/man7/proxy-certificates.html.
9153 - bpo-31861: Add builtins.aiter and builtins.anext. Patch by Joshua Bronson
9157 -------------
9159 - bpo-43199: Answer "Why is there no goto?" in the Design and History FAQ.
9161 - bpo-43407: Clarified that a result from :func:`time.monotonic`,
9164   following call to the same function - not just the next immediate call.
9166 - bpo-43354: Fix type documentation for ``Fault.faultCode``; the type has to
9169 - bpo-41933: Clarified wording of s * n in the Common Sequence Operations
9172 -----
9174 - bpo-37945: Fix test_getsetlocale_issue1813() of test_locale: skip the test
9177 - bpo-41561: Add workaround for Ubuntu's custom OpenSSL security level
9181 -----
9183 - bpo-43179: Introduce and correctly use ALIGNOF_X in place of SIZEOF_X for
9184   alignment-related code in optimized string routines. Patch by Jessica
9187 - bpo-43631: Update macOS, Windows, and CI to OpenSSL 1.1.1k.
9189 - bpo-43617: Improve configure.ac: Check for presence of autoconf-archive
9192 - bpo-43466: The ``configure`` script now supports ``--with-openssl-rpath``
9195 - bpo-43372: Use ``_freeze_importlib`` to generate code for the
9199   changed with bpo-42246, commit 877df851. Update the code and the expected
9203 -------
9205 - bpo-43440: Build :mod:`sqlite3` with the ``R*Tree`` module enabled. Patch
9209 ----
9211 - bpo-42225: Document that IDLE can fail on Unix either from misconfigured
9212   IP masquerade rules or failure displaying complex colored (non-ascii)
9216 -----
9218 - bpo-43688: The limited C API is now supported if Python is built in debug
9219   mode (if the ``Py_DEBUG`` macro is defined). In the limited C API, the
9222   :c:member:`PyObject.ob_refcnt` member, if Python is built in debug mode
9225   :c:type:`PyObject` structure is the same in release and debug mode since
9228   The limited C API is still not supported in the ``--with-trace-refs``
9233 - bpo-43244: Remove the ``pyarena.h`` header file with functions:
9243 - bpo-43244: Remove the compiler and parser functions using ``struct _mod``
9260 - bpo-43244: Remove ``ast.h``, ``asdl.h``, and ``Python-ast.h`` header
9263   and so could create names conflicts. For example, ``Python-ast.h`` defined
9268 - bpo-43541: Fix a ``PyEval_EvalCodeEx()`` regression: fix reference
9271 - bpo-43244: Remove the ``symtable.h`` header file and the undocumented
9285   The Python :mod:`symtable` module remains available and is unchanged.
9289 - bpo-43244: Remove the ``PyAST_Validate()`` function. It is no longer
9298 *Release date: 2021-03-01*
9301 --------
9303 - bpo-42967: Fix web cache poisoning vulnerability by defaulting the query
9308 -----------------
9310 - bpo-43321: Fix ``SystemError`` raised when ``PyArg_Parse*()`` is used with
9313 - bpo-36346: ``PyArg_Parse*()`` functions now emits ``DeprecationWarning``
9314   when ``u`` or ``Z`` format is used. See :pep:`623` for detail.
9316 - bpo-43277: Add a new :c:func:`PySet_CheckExact` function to the C-API to
9317   check if an object is an instance of :class:`set` but not an instance of a
9320 - bpo-42990: The :data:`types.FunctionType` constructor now inherits the
9324   function(...): ...`` in Python is not affected, globals cannot be
9328 - bpo-42990: Functions have a new ``__builtins__`` attribute which is used
9329   to look for builtin symbols when a function is executed, instead of
9333 - bpo-43149: Improve the error message in the parser for exception groups
9336 - bpo-43121: Fixed an incorrect :exc:`SyntaxError` message for missing comma
9339 - bpo-42819: :mod:`readline`: Explicitly disable bracketed paste in the
9340   interactive interpreter, even if it's set in the inputrc, is enabled by
9346   ``readline.parse_and_bind("set enable-bracketed-paste on")``. Patch by
9349 - bpo-42808: Simple calls to ``type(object)`` are now faster due to the
9352 - bpo-42217: Make the compiler merges same co_code and co_linetable objects
9355 - bpo-41972: Substring search functions such as ``str1 in str2`` and
9356   ``str2.find(str1)`` now sometimes use the "Two-Way" string comparison
9359 - bpo-42128: Implement :pep:`634` (structural pattern matching). Patch by
9362 - bpo-40692: In the :class:`concurrent.futures.ProcessPoolExecutor`,
9363   validate that :func:`multiprocess.synchronize` is available on a given
9368 - bpo-38302: If :func:`object.__ipow__` returns :const:`NotImplemented`, the
9373 -------
9375 - bpo-43316: The ``python -m gzip`` command line application now properly
9376   fails when detecting an unsupported extension. It exits with a non-zero
9379 - bpo-43317: Set the chunk size for the ``gzip`` module main function to
9380   io.DEFAULT_BUFFER_SIZE. This is slightly faster than the 1024 bytes
9383 - bpo-43146: Handle None in single-arg versions of
9387 - bpo-43260: Fix TextIOWrapper can not flush internal buffer forever after
9388   very large text is written.
9390 - bpo-43258: Prevent needless allocation of :mod:`sqlite3` aggregate
9394 - bpo-43251: Improve :mod:`sqlite3` error handling:
9398 - bpo-40956: Fix segfault in :meth:`sqlite3.Connection.backup` if no
9402 - bpo-43172: The readline module now passes its tests when built directly
9407 - bpo-43163: Fix a bug in :mod:`codeop` that was causing it to not ask for
9408   more input when multi-line snippets have unclosed parentheses. Patch by
9411 - bpo-43162: deprecate unsupported ability to access enum members as
9414 - bpo-43146: Fix recent regression in None argument handling in
9417 - bpo-43102: The namedtuple __new__ method had its __builtins__ set to None
9421 - bpo-43106: Added :data:`~os.O_EVTONLY`, :data:`~os.O_FSYNC`,
9423   Dong-hee Na.
9425 - bpo-42960: Adds :data:`resource.RLIMIT_KQUEUES` constant from FreeBSD to
9428 - bpo-42151: Make the pure Python implementation of
9433 - bpo-29753: In ctypes, now packed bitfields are calculated properly and the
9434   first item of packed bitfields is now shrank correctly.
9437 -------------
9439 - bpo-27646: Clarify that 'yield from <expr>' works with any iterable, not
9442 - bpo-36346: Update some deprecated unicode APIs which are documented as
9446 -----
9448 - bpo-43288: Fix test_importlib to correctly skip Unicode file tests if the
9452 -----
9454 - bpo-43174: Windows build now uses ``/utf-8`` compiler option.
9456 - bpo-43103: Add a new configure ``--without-static-libpython`` option to
9460 - bpo-13501: The configure script can now use *libedit* instead of
9461   *readline* with the command line option ``--with-readline=editline``.
9463 - bpo-42603: Make configure script use pkg-config to detect the location of
9466   On macOS, a Tcl/Tk configuration provided by pkg-config will be preferred
9468   both exist and the latter is preferred, the appropriate ``--with-tcltk-*``
9471 - bpo-39448: Add the "regen-frozen" makefile target that regenerates the
9475 -------
9477 - bpo-43155: :c:func:`PyCMethod_New` is now present in ``python3.lib``.
9480 -----
9482 - bpo-41837: Update macOS installer build to use OpenSSL 1.1.1j.
9485 ----
9487 - bpo-43283: Document why printing to IDLE's Shell is often slower than
9489   pre-formatting a single string before printing.
9492 -----
9494 - bpo-43278: Always put compiler and system information on the first line of
9497 - bpo-43270: Remove the private ``_PyErr_OCCURRED()`` macro: use the public
9500 - bpo-35134: Move odictobject.h, parser_interface.h, picklebufobject.h,
9503   Files <api-includes>`.
9505 - bpo-35134: Move pyarena.h, pyctype.h, and pytime.h into the cpython/
9507   included by Python.h: :ref:`Include Files <api-includes>`.
9509 - bpo-40170: :c:func:`PyExceptionClass_Name` is now always declared as a
9513 - bpo-43239: The :c:func:`PyCFunction_New` function is now exported in the
9514   ABI when compiled with ``-fvisibility=hidden``.
9516 - bpo-40170: :c:func:`PyIter_Check` is now always declared as a function, in
9520 - bpo-40170: Convert :c:func:`PyDescr_IsData` macro to a function to hide
9525 - bpo-43181: Convert :c:func:`PyObject_TypeCheck` macro to a static inline
9532 *Release date: 2021-02-02*
9535 --------
9537 - bpo-42938: Avoid static buffers when computing the repr of
9541 -----------------
9543 - bpo-42990: Refactor the ``PyEval_`` family of functions.
9545   * An new function ``_PyEval_Vector`` is added to simplify calls to Python from C.
9546   * ``_PyEval_EvalCodeWithName`` is removed
9547   * ``PyEval_EvalCodeEx`` is retained as part of the API, but is not used internally
9549 - bpo-38631: Replace :c:func:`Py_FatalError` calls in the compiler with
9552 - bpo-42997: Improve error message for missing ":" before blocks. Patch by
9555 - bpo-43017: Improve error message in the parser when using un-parenthesised
9558 - bpo-42986: Fix parser crash when reporting syntax errors in f-string with
9561 - bpo-40176: Syntax errors for unterminated string literals now point to the
9564 - bpo-42927: The inline cache for ``LOAD_ATTR`` now also optimizes access to
9568 - bpo-42864: Improve error messages in the parser when parentheses are not
9571 - bpo-42924: Fix ``bytearray`` repetition incorrectly copying data from the
9572   start of the buffer, even if the data is offset within the buffer (e.g.
9576 - bpo-42882: Fix the :c:func:`_PyUnicode_FromId` function
9578   :c:func:`Py_Finalize` is called multiple times: preserve
9581 - bpo-42827: Fix a crash when working out the error line of a
9582   :exc:`SyntaxError` in some multi-line expressions.
9584 - bpo-42823: frame.f_lineno is correct even if frame.f_trace is set to True
9586 - bpo-37324: Remove deprecated aliases to
9587   :ref:`collections-abstract-base-classes` from the :mod:`collections`
9590 - bpo-41994: Fixed possible leak in ``import`` when ``sys.modules`` is not a
9593 - bpo-27772: In string formatting, preceding the *width* field by ``'0'`` no
9597 -------
9599 - bpo-43108: Fixed a reference leak in the :mod:`curses` module. Patch by
9602 - bpo-43077: Update the bundled pip to 21.0.1 and setuptools to 52.0.0.
9604 - bpo-41282: Deprecate ``distutils`` in documentation and add warning on
9607 - bpo-43014: Improve performance of :mod:`tokenize` by 20-30%.  Patch by
9610 - bpo-42323: Fix :func:`math.nextafter` for NaN on AIX.
9612 - bpo-42955: Add :data:`sys.stdlib_module_names`, containing the list of the
9615 - bpo-42944: Fix ``random.Random.sample`` when ``counts`` argument is not
9618 - bpo-42934: Use :class:`~traceback.TracebackException`'s new ``compact``
9622 - bpo-42931: Add :func:`randbytes` to ``random.__all__``.
9624 - bpo-38250: [Enum] Flags consisting of a single bit are now considered
9626   over a Flag class or a Flag member.  Multi-bit flags are considered
9628   their value. Iteration for both Flag and Flag members is in definition
9631 - bpo-42877: Added the ``compact`` parameter to the constructor of
9636 - bpo-42923: The :c:func:`Py_FatalError` function and the
9640 - bpo-42848: Removed recursion from :class:`~traceback.TracebackException`
9643 - bpo-42901: [Enum] move member creation from ``EnumMeta.__new__`` to
9647 - bpo-42780: Fix os.set_inheritable() for O_PATH file descriptors on Linux.
9649 - bpo-42866: Fix a reference leak in the ``getcodec()`` function of CJK
9652 - bpo-42846: Convert the 6 CJK codec extension modules (_codecs_cn,
9656 - bpo-42851: remove __init_subclass__ support for Enum members
9658 - bpo-42834: Make internal caches of the ``_json`` module compatible with
9661 - bpo-41748: Fix HTMLParser parsing rules for element attributes containing
9664 - bpo-40810: Require SQLite 3.7.15 or newer. Patch by Erlend E. Aasland.
9666 - bpo-1635741: Convert the _multibytecodec extension module (CJK codecs) to
9667   multi-phase initialization (:pep:`489`).  Patch by Erlend E. Aasland.
9669 - bpo-42802: The distutils ``bdist_wininst`` command deprecated in Python
9670   3.8 has been removed. The distutils ``bdist_wheel`` command is now
9673 - bpo-24464: The undocumented built-in function
9674   ``sqlite3.enable_shared_cache`` is now deprecated, scheduled for removal
9675   in Python 3.12.  Its use is strongly discouraged by the SQLite3
9678 - bpo-42384: Make pdb populate sys.path[0] exactly the same as regular
9681 - bpo-42383: Fix pdb: previously pdb would fail to restart the debugging
9685 - bpo-42005: Fix CLI of :mod:`cProfile` and :mod:`profile` to catch
9688 - bpo-41604: Don't decrement the reference count of the previous user_ptr
9691 - bpo-41149: Allow executing callables that have a boolean value of
9695 - bpo-38307: Add an 'end_lineno' attribute to the Class and Function objects
9700 - bpo-39273: The ``BUTTON5_*`` constants are now exposed in the
9703 - bpo-33289: Correct call to :mod:`tkinter.colorchooser` to return RGB
9707 -------------
9709 - bpo-40304: Fix doc for type(name, bases, dict).  Patch by Boris
9712 - bpo-42811: Updated importlib.utils.resolve_name() doc to use
9716 -----
9718 - bpo-40823: Use :meth:`unittest.TestLoader().loadTestsFromTestCase` instead
9722 - bpo-40810: In :mod:`sqlite3`, fix ``CheckTraceCallbackContent`` for SQLite
9726 -----
9728 - bpo-43031: Pass ``--timeout=$(TESTTIMEOUT)`` option to the default profile
9729   task ``./python -m test --pgo`` command.
9731 - bpo-36143: ``make regen-all`` now also runs ``regen-keyword``. Patch by
9734 - bpo-42874: Removed the grep -q and -E flags in the tzpath validation
9738 - bpo-31904: Add library search path by wr-cc in add_cross_compiling_paths()
9741 - bpo-42856: Add ``--with-wheel-pkg-dir=PATH`` option to the ``./configure``
9748   ``/usr/share/python-wheels/`` directory and don't install the
9752 -------
9754 - bpo-41837: Updated Windows installer to include OpenSSL 1.1.1i
9756 - bpo-42584: Upgrade Windows installer to use SQLite 3.34.0.
9759 -----
9761 - bpo-42504: Ensure that the value of
9762   sysconfig.get_config_var('MACOSX_DEPLOYMENT_TARGET') is always a string,
9763   even in when the value is parsable as an integer.
9766 ----
9768 - bpo-43008: Make IDLE invoke :func:`sys.excepthook` in normal, 2-process
9771 - bpo-33065: Fix problem debugging user classes with __repr__ method.
9773 - bpo-23544: Disable Debug=>Stack Viewer when user code is running or
9774   Debugger is active, to prevent hang or crash.  Patch by Zackery Spytz.
9776 - bpo-32631: Finish zzdummy example extension module: make menu entries
9780 -----
9782 - bpo-42979: When Python is built in debug mode (with C assertions), calling
9786   current exception (if an exception is set). Patch by Victor Stinner.
9788 - bpo-43030: Fixed a compiler warning in :c:func:`Py_UNICODE_ISSPACE()` on
9795 *Release date: 2021-01-04*
9798 -----------------
9800 - bpo-42814: Fix undefined behavior in ``Objects/genericaliasobject.c``.
9802 - bpo-42806: Fix the column offsets for f-strings :mod:`ast` nodes
9806 - bpo-40631: Fix regression where a single parenthesized starred expression
9809 - bpo-27794: Improve the error message for failed writes/deletes to property
9810   objects. When possible, the attribute name is now shown. Patch provided by
9813 - bpo-42745: Make the type attribute lookup cache per-interpreter. Patch by
9816 - bpo-42246: Jumps to jumps are not eliminated when it would break PEP 626.
9818 - bpo-42246: Make sure that the ``f_lasti`` and ``f_lineno`` attributes of a
9819   frame are set correctly when an exception is raised or re-raised. Required
9822 - bpo-32381: The coding cookie (ex: ``# coding: latin1``) is now ignored in
9823   the command passed to the :option:`-c` command line option. Patch by
9826 - bpo-30858: Improve error location in expressions that contain assignments.
9829 - bpo-42615: Remove jump commands made redundant by the deletion of
9832 - bpo-42639: Make the :mod:`atexit` module state per-interpreter. It is now
9833   safe have more than one :mod:`atexit` module instance. Patch by Dong-hee
9836 - bpo-32381: Fix encoding name when running a ``.pyc`` file on Windows:
9840 - bpo-42195: The ``__args__`` of the parameterized generics for
9847   not subclass things like ``Callable[..., T]`` as that is not a valid base
9852 - bpo-40137: Convert functools module to use
9855 - bpo-40077: Convert :mod:`array` to use heap types, and establish module
9858 - bpo-42008: Fix _random.Random() seeding.
9860 - bpo-1635741: Port the :mod:`pyexpat` extension module to multi-phase
9863 - bpo-40521: Make the Unicode dictionary of interned strings compatible with
9866 - bpo-39465: Make :c:func:`_PyUnicode_FromId` function compatible with
9868   (interned strings decoded from UTF-8). Patch by Victor Stinner.
9871 -------
9873 - bpo-42257: Handle empty string in variable executable in
9876 - bpo-42772: randrange() now raises a TypeError when step is specified
9879 - bpo-42759: Fixed equality comparison of :class:`tkinter.Variable` and
9883 - bpo-42756: Configure LMTP Unix-domain socket to use socket global default
9884   timeout when a timeout is not explicitly provided.
9886 - bpo-23328: Allow / character in username, password fields on _PROXY
9889 - bpo-42740: :func:`typing.get_args` and :func:`typing.get_origin` now
9892 - bpo-42655: :mod:`subprocess` *extra_groups* is now correctly passed into
9895 - bpo-42727: ``EnumMeta.__prepare__`` now accepts ``**kwds`` to properly
9898 - bpo-38308: Add optional *weights* to *statistics.harmonic_mean()*.
9900 - bpo-42721: When simple query dialogs (:mod:`tkinter.simpledialog`),
9903   *parent*, and the default root window is not yet created, and
9910 - bpo-25246: Optimized :meth:`collections.deque.remove`.
9912 - bpo-35728: Added a root parameter to :func:`tkinter.font.nametofont`.
9914 - bpo-15303: :mod:`tkinter` supports now widgets with boolean value False.
9916 - bpo-42681: Fixed range checks for color and pair numbers in :mod:`curses`.
9918 - bpo-42685: Improved placing of simple query windows in Tkinter (such as
9920   center of the parent window if it is specified and shown, otherwise at the
9923 - bpo-9694: Argparse help no longer uses the confusing phrase, "optional
9926 - bpo-1635741: Port the :mod:`_thread` extension module to the multiphase
9930 - bpo-37961: Fix crash in :func:`tracemalloc.Traceback.__repr__` (regressed
9933 - bpo-42630: :mod:`tkinter` functions and constructors which need a default
9935   of obscure :exc:`AttributeError` or :exc:`NameError` if it is not created
9938 - bpo-42639: :func:`atexit._run_exitfuncs` now logs callback exceptions
9942 - bpo-42644: ``logging.disable`` will now validate the types and value of
9946 - bpo-42639: At Python exit, if a callback registered with
9947   :func:`atexit.register` fails, its exception is now logged. Previously,
9951 - bpo-36541: Fixed lib2to3.pgen2 to be able to parse PEP-570 positional only
9954 - bpo-42382: In ``importlib.metadata``: -  ``EntryPoint`` objects now expose
9956   a ``Distribution``. - Add support for package discovery under package
9957   normalization rules. - The object returned by ``metadata()`` now has a
9959   for the ``.get_all()`` method. - Synced with importlib_metadata 3.3.
9961 - bpo-41877: A check is added against misspellings of autospect, auto_spec
9965 - bpo-39717: [tarfile] update nested exception raising to use ``from None``
9968 - bpo-41877: AttributeError for suspected misspellings of assertions on
9970   also what to do if the misspelling is actually an intended attribute name.
9971   The unittest.mock document is also updated to reflect the current set of
9974 - bpo-41559: Implemented :pep:`612`: added ``ParamSpec`` and ``Concatenate``
9977 - bpo-42385: StrEnum: fix _generate_next_value_ to return a str
9979 - bpo-31904: Define THREAD_STACK_SIZE for VxWorks.
9981 - bpo-34750: [Enum] `_EnumDict.update()` is now supported
9983 - bpo-42517: Enum: private names do not become members / do not generate
9984   errors -- they remain normal attributes
9986 - bpo-42678: ``Enum``: call ``__init_subclass__`` after members have been
9989 - bpo-28964: :func:`ast.literal_eval` adds line number information (if
9992 - bpo-42470: :func:`random.sample` no longer warns on a sequence which is
9995 - bpo-31904: :func:`posixpath.expanduser` returns the input *path* unchanged
9996   if user home directory is None on VxWorks.
9998 - bpo-42388: Fix subprocess.check_output(..., input=None) behavior when
10002 - bpo-34463: Fixed discrepancy between :mod:`traceback` and the interpreter
10006 - bpo-42393: Raise :exc:`OverflowError` instead of silent truncation in
10010 - bpo-42222: Harmonized :func:`random.randrange` argument handling to match
10015   * Non-integer arguments to ``randrange()`` are deprecated.
10016   * The ``ValueError`` is deprecated in favor of a ``TypeError``.
10021 - bpo-42163: Restore compatibility for ``uname_result`` around deepcopy and
10024 - bpo-42090: ``zipfile.Path.joinpath`` now accepts arbitrary arguments, same
10027 - bpo-1635741: Port the _csv module to the multi-phase initialization API
10030 - bpo-42059: :class:`typing.TypedDict` types created using the alternative
10031   call-style syntax now correctly respect the ``total`` keyword argument
10035 - bpo-41960: Add ``globalns`` and ``localns`` parameters to the
10038 - bpo-41907: fix ``format()`` behavior for ``IntFlag``
10040 - bpo-41891: Ensure asyncio.wait_for waits for task completion
10042 - bpo-24792: Fixed bug where :mod:`zipimporter` sometimes reports an
10045 - bpo-31904: Fix site and sysconfig modules for VxWorks RTOS which has no
10048 - bpo-41462: Add :func:`os.set_blocking()` support for VxWorks RTOS.
10050 - bpo-40219: Lowered :class:`tkinter.ttk.LabeledScale` dummy widget to
10053 - bpo-37193: Fixed memory leak in ``socketserver.ThreadingMixIn`` introduced
10056 - bpo-39068: Fix initialization race condition in :func:`a85encode` and
10060 -------------
10062 - bpo-17140: Add documentation for the
10065 - bpo-34398: Prominently feature listings from the glossary in documentation
10069 -----
10071 - bpo-42794: Update test_nntplib to use official group name of news.aioe.org
10072   for testing. Patch by Dong-hee Na.
10074 - bpo-31904: Skip some asyncio tests on VxWorks.
10076 - bpo-42641: Enhance ``test_select.test_select()``: it now takes 500
10080 - bpo-31904: Skip some tests in _test_all_chown_common() on VxWorks.
10082 - bpo-42199: Fix bytecode helper assertNotInBytecode.
10084 - bpo-41443: Add more attribute checking in test_posix.py
10086 - bpo-31904: Disable os.popen and impacted tests on VxWorks
10088 - bpo-41439: Port test_ssl and test_uuid to VxWorks RTOS.
10091 -----
10093 - bpo-42692: Fix __builtin_available check on older compilers. Patch by
10096 - bpo-27640: Added ``--disable-test-modules`` option to the ``configure``
10100 - bpo-42604: Now all platforms use a value for the "EXT_SUFFIX" build
10101   variable derived from SOABI (for instance in freeBSD, "EXT_SUFFIX" is now
10102   ".cpython-310d.so" instead of ".so"). Previously only Linux, Mac and
10105 - bpo-42598: Fix implicit function declarations in configure which could
10109 - bpo-31904: Enable libpython3.so for VxWorks.
10111 - bpo-29076: Add fish shell support to macOS installer.
10114 -----
10116 - bpo-42361: Update macOS installer build to use Tcl/Tk 8.6.11 (rc2,
10119 - bpo-41837: Update macOS installer build to use OpenSSL 1.1.1i.
10121 - bpo-42584: Update macOS installer to use SQLite 3.34.0.
10124 -----------
10126 - bpo-42726: Fixed Python 3 compatibility issue with gdb/libpython.py
10129 - bpo-42613: Fix ``freeze.py`` tool to use the prope config and library
10133 -----
10135 - bpo-42591: Export the :c:func:`Py_FrozenMain` function: fix a Python 3.9.0
10136   regression. Python 3.9 uses ``-fvisibility=hidden`` and the function was
10139 - bpo-32381: Remove the private :c:func:`_Py_fopen` function which is no
10143 - bpo-1635741: Port :mod:`resource` extension module to module state
10145 - bpo-42111: Update the ``xxlimited`` module to be a better example of how
10148 - bpo-40052: Fix an alignment build warning/error in function
10156 *Release date: 2020-12-07*
10159 --------
10161 - bpo-40791: Add ``volatile`` to the accumulator variable in
10162   ``hmac.compare_digest``, making constant-time-defeating optimizations less
10166 -----------------
10168 - bpo-42576: ``types.GenericAlias`` will now raise a ``TypeError`` when
10174 - bpo-42536: Several built-in and standard library types now ensure that
10178   - :meth:`collections.OrderedDict.items() <collections.OrderedDict>`
10180   - :meth:`dict.items`
10182   - :func:`enumerate`
10184   - :func:`functools.reduce`
10186   - :func:`itertools.combinations`
10188   - :func:`itertools.combinations_with_replacement`
10190   - :func:`itertools.permutations`
10192   - :func:`itertools.product`
10194   - :func:`itertools.zip_longest`
10196   - :func:`zip`
10201 - bpo-42500: Improve handling of exceptions near recursion limit. Converts a
10204 - bpo-42246: PEP 626: After a return, the f_lineno attribute of a frame is
10207 - bpo-42435: Speed up comparison of bytes objects with non-bytes objects
10208   when option :option:`-b` is specified. Speed up comparison of bytarray
10209   objects with non-buffer object.
10211 - bpo-1635741: Port the ``_warnings`` extension module to the multi-phase
10214 - bpo-41686: On Windows, the ``SIGINT`` event, ``_PyOS_SigintEvent()``, is
10215   now created even if Python is configured to not install signal handlers
10219 - bpo-42381: Allow assignment expressions in set literals and set
10222 - bpo-42202: Change function parameters annotations internal representation
10225 - bpo-42374: Fix a regression introduced by the new parser, where an
10229 - bpo-42316: Allow an unparenthesized walrus in subscript indexes.
10231 - bpo-42349: Make sure that the compiler front-end produces a well-formed
10232   control flow graph. Be be more aggressive in the compiler back-end, as it
10233   is now safe to do so.
10235 - bpo-42296: On Windows, fix a regression in signal handling which prevented
10238   if the thread can handle signals is wrong.
10240 - bpo-42332: :class:`types.GenericAlias` objects can now be the targets of
10243 - bpo-42282: Optimise constant subexpressions that appear as part of named
10247 - bpo-42266: Fixed a bug with the LOAD_ATTR opcode cache that was not
10248   respecting monkey-patching a class-level attribute to make it a
10251 - bpo-40077: Convert :mod:`queue` to use heap types.
10253 - bpo-42246: Improved accuracy of line tracing events and f_lineno attribute
10256 - bpo-40077: Convert :mod:`mmap` to use heap types.
10258 - bpo-42233: Allow ``GenericAlias`` objects to use :ref:`union type
10259   expressions <types-union>`. This allows expressions like ``list[int] |
10261   thrown.  This also fixes union type expressions not de-duplicating
10264 - bpo-26131: The import system triggers a `ImportWarning` when it falls back
10268 -------
10270 - bpo-5054: CGIHTTPRequestHandler.run_cgi() HTTP_ACCEPT improperly parsed.
10276 - bpo-42562: Fix issue when dis failed to parse function that has no line
10279 - bpo-17735: :func:`inspect.findsource` now raises :exc:`OSError` instead of
10280   :exc:`IndexError` when :attr:`co_lineno` of a code object is greater than
10281   the file length. This can happen, for example, when a file is edited after
10284 - bpo-42116: Fix handling of trailing comments by :func:`inspect.getsource`.
10286 - bpo-42532: Remove unexpected call of ``__bool__`` when passing a
10289 - bpo-38200: Added itertools.pairwise()
10291 - bpo-41818: Fix test_master_read() so that it succeeds on all platforms
10294 - bpo-42487: ChainMap.__iter__ no longer calls __getitem__ on underlying
10297 - bpo-42482: :class:`~traceback.TracebackException` no longer holds a
10299   TracebackException for equivalent but non-equal exceptions now compare as
10302 - bpo-41818: Make test_openpty() avoid unexpected success due to number of
10305 - bpo-42392: Remove loop parameter from ``asyncio.subprocess`` and
10308 - bpo-42392: Remove loop parameter from ``asyncio.open_connection`` and
10311 - bpo-28468: Add :func:`platform.freedesktop_os_release` function to parse
10312   freedesktop.org ``os-release`` files.
10314 - bpo-42299: Removed the ``formatter`` module, which was deprecated in
10315   Python 3.4. It is somewhat obsolete, little used, and not tested. It was
10318   classes they use into their code. Patch by Dong-hee Na and and Terry J.
10321 - bpo-26131: Deprecate zipimport.zipimporter.load_module() in favour of
10324 - bpo-41818: Updated tests for the pty library. test_basic() has been
10331 - bpo-42392: Remove loop parameter from ``__init__`` in all
10335 - bpo-15450: Make :class:`filecmp.dircmp` respect subclassing. Now the
10339 - bpo-42413: The exception :exc:`socket.timeout` is now an alias of
10342 - bpo-31904: Support signal module on VxWorks.
10344 - bpo-42406: We fixed an issue in `pickle.whichmodule` in which importing
10348 - bpo-42403: Simplify the :mod:`importlib` external bootstrap code:
10350   builtin modules. When it is imported, the builtin :func:`__import__()`
10351   function is already fully working and so can be used to import builtin
10354 - bpo-1635741: Convert _sre module types to heap types (PEP 384). Patch by
10357 - bpo-42375: subprocess module update for DragonFlyBSD support.
10359 - bpo-41713: Port the ``_signal`` extension module to the multi-phase
10363 - bpo-37205: :func:`time.time()`, :func:`time.perf_counter()` and
10367 - bpo-42328: Fixed :meth:`tkinter.ttk.Style.map`. The function accepts now
10369   ``Style.map()``). The structure of the result is now the same on all
10372 - bpo-42345: Fix various issues with ``typing.Literal`` parameter handling
10376 - bpo-37205: :func:`time.perf_counter()` on Windows and
10377   :func:`time.monotonic()` on macOS are now system-wide. Previously, they
10383 - bpo-42318: Fixed support of non-BMP characters in :mod:`tkinter` on macOS.
10385 - bpo-42350: Fix the :class:`threading.Thread` class at fork: do nothing if
10386   the thread is already stopped (ex: fork called at Python exit).
10389 - bpo-42333: Port _ssl extension module to heap types.
10391 - bpo-42014: The ``onerror`` callback from ``shutil.rmtree`` now receives
10394 - bpo-42237: Fix `os.sendfile()` on illumos.
10396 - bpo-42308: Add :data:`threading.__excepthook__` to allow retrieving the
10397   original value of :func:`threading.excepthook` in case it is set to a
10400 - bpo-42131: Implement PEP 451/spec methods on zipimport.zipimporter:
10406 - bpo-41877: Mock objects which are not unsafe will now raise an
10407   AttributeError if an attribute with the prefix asert, aseert, or assrt is
10411 - bpo-42264: ``sqlite3.OptimizedUnicode`` has been undocumented and obsolete
10412   since Python 3.3, when it was made an alias to :class:`str`.  It is now
10415 - bpo-42251: Added :func:`threading.gettrace` and
10420 - bpo-42249: Fixed writing binary Plist files larger than 4 GiB.
10422 - bpo-42236: On Unix, the :func:`os.device_encoding` function now returns
10423   ``'UTF-8'`` rather than the device encoding if the :ref:`Python UTF-8 Mode
10424   <utf8-mode>` is enabled.
10426 - bpo-41754: webbrowser: Ignore *NotADirectoryError* when calling
10427   ``xdg-settings``.
10429 - bpo-42183: Fix a stack overflow error for asyncio Task or Future repr().
10434 - bpo-42140: Improve asyncio.wait function to create the futures set just
10437 - bpo-42133: Update various modules in the stdlib to fall back on
10440 - bpo-26131: The `load_module()` methods found in importlib now trigger a
10443 - bpo-39825: Windows: Change ``sysconfig.get_config_var('EXT_SUFFIX')`` to
10445   hard-coded to ``.pyd``, now it is compatible with ``distutils.sysconfig``
10446   and will result in something like ``.cp38-win_amd64.pyd``. This brings
10449 - bpo-26389: The :func:`traceback.format_exception`,
10452   object as a positional-only argument.
10454 - bpo-41889: Enum: fix regression involving inheriting a multiply inherited
10457 - bpo-41861: Convert :mod:`sqlite3` to use heap types (PEP 384). Patch by
10460 - bpo-40624: Added support for the XPath ``!=`` operator in xml.etree
10462 - bpo-28850: Fix :meth:`pprint.PrettyPrinter.format` overrides being ignored
10466 - bpo-41625: Expose the :c:func:`splice` as :func:`os.splice` in the
10469 - bpo-34215: Clarify the error message for
10470   :exc:`asyncio.IncompleteReadError` when ``expected`` is ``None``.
10472 - bpo-41543: Add async context manager support for contextlib.nullcontext.
10474 - bpo-21041: :attr:`pathlib.PurePath.parents` now supports negative
10477 - bpo-41332: Added missing connect_accepted_socket() method to
10480 - bpo-12800: Extracting a symlink from a tarball should succeed and
10481   overwrite the symlink if it already exists. The fix is to remove the
10485 - bpo-40968: :mod:`urllib.request` and :mod:`http.client` now send
10486   ``http/1.1`` ALPN extension during TLS handshake when no custom context is
10489 - bpo-41001: Add func:`os.eventfd` to provide a low level interface for
10492 - bpo-40816: Add AsyncContextDecorator to contextlib to support async
10495 - bpo-40550: Fix time-of-check/time-of-action issue in
10498 - bpo-39411: Add an ``is_async`` identifier to :mod:`pyclbr`'s ``Function``
10501 - bpo-35498: Add slice support to :attr:`pathlib.PurePath.parents`.
10504 -------------
10506 - bpo-42238: Tentative to deprecate ``make suspicious`` by first removing it
10510 - bpo-42153: Fix the URL for the IMAP protocol documents.
10512 - bpo-41028: Language and version switchers, previously maintained in every
10513   cpython branches, are now handled by docsbuild-script.
10516 -----
10518 - bpo-41473: Re-enable test_gdb on gdb 9.2 and newer:
10519   https://bugzilla.redhat.com/show_bug.cgi?id=1866884 bug is fixed in gdb
10522 - bpo-42553: Fix ``test_asyncio.test_call_later()`` race condition: don't
10526 - bpo-31904: Fix test_netrc on VxWorks: create temporary directories using
10529 - bpo-31904: skip test_getaddrinfo_ipv6_scopeid_symbolic and
10532 - bpo-31904: skip test_test of test_mailcap on VxWorks
10534 - bpo-31904: add shell requirement for test_pipes
10536 - bpo-31904: skip some tests related to fifo on VxWorks
10538 - bpo-31904: Fix test_doctest.py failures for VxWorks.
10540 - bpo-40754: Include ``_testinternalcapi`` module in Windows installer for
10543 - bpo-41561: test_ssl: skip test_min_max_version_mismatch when TLS 1.0 is
10546 - bpo-31904: Fix os module failures for VxWorks RTOS.
10548 - bpo-31904: Fix fifo test cases for VxWorks RTOS.
10551 -----
10553 - bpo-31904: remove libnet dependency from detect_socket() for VxWorks
10555 - bpo-42398: Fix a race condition in "make regen-all" when make -jN option
10556   is used to run jobs in parallel. The clinic.py script now only use atomic
10560 - bpo-41617: Fix building ``pycore_bitutils.h`` internal header on old clang
10564 - bpo-38823: It is no longer possible to build the ``_ctypes`` extension
10566   Anyway, the :c:type:`wchar_t` type is required to build Python. Patch by
10569 - bpo-42087: Support was removed for AIX 5.3 and below. See :issue:`40680`.
10571 - bpo-40998: Addressed three compiler warnings found by undefined behavior
10575 -------
10577 - bpo-42120: Remove macro definition of ``copysign`` (to ``_copysign``) in
10580 - bpo-38506: The Windows launcher now properly handles Python 3.10 when
10584 -----
10586 - bpo-42504: Fix build on macOS Big Sur when MACOSX_DEPLOYMENT_TARGET=11
10588 - bpo-41116: Ensure distutils.unixxcompiler.find_library_file can find
10591 - bpo-41100: Add support for macOS 11 and Apple Silicon systems.
10593   It is now possible to build "Universal 2" binaries using
10594   "--enable-universalsdk --with-universal-archs=universal2".
10598   target. This is tested using Xcode 11 and later.
10600 - bpo-42232: Added Darwin specific madvise options to mmap module.
10602 - bpo-38443: The ``--enable-universalsdk`` and ``--with-universal-archs``
10607 ----
10609 - bpo-42508: Keep IDLE running on macOS.  Remove obsolete workaround that
10613 - bpo-42426: Fix reporting offset of the RE error in searchengine.
10615 - bpo-42415: Get docstrings for IDLE calltips more often by using
10619 -----------
10621 - bpo-42212: The smelly.py script now also checks the Python dynamic library
10625 - bpo-36310: Allow :file:`Tools/i18n/pygettext.py` to detect calls to
10626   ``gettext`` in f-strings.
10629 -----
10631 - bpo-42423: The :c:func:`PyType_FromSpecWithBases` and
10635 - bpo-1635741: Port :mod:`select` extension module to multiphase
10638 - bpo-1635741: Port _posixsubprocess extension module to multiphase
10641 - bpo-1635741: Port _posixshmem extension module to multiphase
10644 - bpo-1635741: Port _struct extension module to multiphase initialization
10647 - bpo-1635741: Port :mod:`spwd` extension module to multiphase
10650 - bpo-1635741: Port :mod:`gc` extension module to multiphase initialization
10653 - bpo-1635741: Port _queue extension module to multiphase initialization
10656 - bpo-39573: Convert :c:func:`Py_TYPE` and :c:func:`Py_SIZE` back to macros
10657   to allow using them as an l-value. Many third party C extension modules
10661 - bpo-1635741: Port :mod:`symtable` extension module to multiphase
10664 - bpo-1635741: Port :mod:`grp` and :mod:`pwd` extension modules to
10667 - bpo-1635741: Port _random extension module to multiphase initialization
10670 - bpo-1635741: Port _hashlib extension module to multiphase initialization
10673 - bpo-41713: Removed the undocumented ``PyOS_InitInterrupts()`` function.
10677 - bpo-40170: The ``Py_TRASHCAN_BEGIN`` macro no longer accesses PyTypeObject
10681 - bpo-42260: :c:func:`Py_GetPath`, :c:func:`Py_GetPrefix`,
10684   return ``NULL`` if called before :c:func:`Py_Initialize` (before Python is
10686   <init-config>` to get the :ref:`Python Path Configuration.
10687   <init-path-config>`. Patch by Victor Stinner.
10689 - bpo-42260: The :c:func:`PyConfig_Read` function now only parses
10691   is set to ``2`` after arguments are parsed. Since Python arguments are
10695 - bpo-42262: Added :c:func:`Py_NewRef` and :c:func:`Py_XNewRef` functions to
10699 - bpo-42260: When :c:func:`Py_Initialize` is called twice, the second call
10703 - bpo-41832: The :c:func:`PyType_FromModuleAndSpec` function now accepts
10706 - bpo-1635741: Added :c:func:`PyModule_AddObjectRef` function: similar to
10710 - bpo-42171: The :c:data:`METH_FASTCALL` calling convention is added to the
10715 - bpo-42085: Add dedicated entry to PyAsyncMethods for sending values
10717 - bpo-41073: :c:func:`PyType_GetSlot()` can now accept static types.
10719 - bpo-30459: :c:func:`PyList_SET_ITEM`, :c:func:`PyTuple_SET_ITEM` and
10720   :c:func:`PyCell_SET` macros can no longer be used as l-value or r-value.
10730 *Release date: 2020-11-03*
10733 --------
10735 - bpo-42103: Prevented potential DoS attack via CPU and RAM exhaustion when
10738 - bpo-42051: The :mod:`plistlib` module no longer accepts entity
10744 -----------------
10746 - bpo-42236: If the ``nl_langinfo(CODESET)`` function returns an empty
10747   string, Python now uses UTF-8 as the filesystem encoding. Patch by Victor
10750 - bpo-42218: Fixed a bug in the PEG parser that was causing crashes in debug
10751   mode. Now errors are checked in left-recursive rules to avoid cases where
10752   such errors do not get handled in time and appear as long-distance crashes
10755 - bpo-42214: Fixed a possible crash in the PEG parser when checking for the
10758 - bpo-42206: Propagate and raise the errors caused by
10761 - bpo-41796: The :mod:`ast` module internal state is now per interpreter.
10764 - bpo-42143: Fix handling of errors during creation of ``PyFunctionObject``,
10768 - bpo-41659: Fix a bug in the parser, where a curly brace following a
10774 - bpo-42150: Fix possible buffer overflow in the new parser when checking
10777 - bpo-42123: Run the parser two times. On the first run, disable all the
10779   there's a parse failure, run the parser a second time with those enabled.
10781 - bpo-42093: The ``LOAD_ATTR`` instruction now uses new "per opcode cache"
10782   mechanism and it is about 36% faster now. Patch by Pablo Galindo and Yury
10785 - bpo-42030: Support for the legacy AIX-specific shared library loading
10789 - bpo-41984: The garbage collector now tracks all user-defined classes.
10792 - bpo-41993: Fixed potential issues with removing not completely initialized
10795 - bpo-41979: Star-unpacking is now allowed for with item's targets in the
10798 - bpo-41974: Removed special methods ``__int__``, ``__float__``,
10803 - bpo-41902: Micro optimization when compute
10806   Dong-hee Na.
10808 - bpo-41894: When loading a native module and a load failure occurs, prevent
10809   a possible UnicodeDecodeError when not running in a UTF-8 locale by
10812 - bpo-41902: Micro optimization for range.index if step is 1. Patch by
10813   Dong-hee Na.
10815 - bpo-41435: Add `sys._current_exceptions()` function to retrieve a
10817   currently active in that thread at the time the function is called.
10819 - bpo-38605: Enable ``from __future__ import annotations`` (:pep:`563`) by
10824 -------
10826 - bpo-35455: On Solaris, :func:`~time.thread_time` is now implemented with
10827   ``gethrvtime()`` because ``clock_gettime(CLOCK_THREAD_CPUTIME_ID)`` is not
10830 - bpo-42233: The :func:`repr` of :mod:`typing` types containing
10831   :ref:`Generic Alias Types <types-genericalias>` previously did not show
10835 - bpo-29566: ``binhex.binhex()`` consistently writes macOS 9 line endings.
10837 - bpo-26789: The :class:`logging.FileHandler` class now keeps a reference to
10839   during Python finalization. Fix errors like: ``NameError: name 'open' is
10842 - bpo-42157: Removed the ``unicodedata.ucnhash_CAPI`` attribute which was an
10846 - bpo-42157: Convert the :mod:`unicodedata` extension module to the
10851 - bpo-42146: Fix memory leak in :func:`subprocess.Popen` in case an uid
10855 - bpo-42103: :exc:`~plistlib.InvalidFileException` and :exc:`RecursionError`
10860 - bpo-41490: In ``importlib.resources``, ``.path`` method is more aggressive
10861   about releasing handles to zipfile objects early, enabling use-cases like
10864 - bpo-41052: Pickling heap types implemented in C with protocols 0 and 1
10867 - bpo-42089: In ``importlib.metadata.PackageNotFoundError``, make reference
10870 - bpo-41491: plistlib: fix parsing XML plists with hexadecimal integer
10873 - bpo-42065: Fix an incorrectly formatted error from
10877 - bpo-41966: Fix pickling pure Python :class:`datetime.time` subclasses.
10880 - bpo-19270: :meth:`sched.scheduler.cancel()` will now cancel the correct
10884 - bpo-28660: :func:`textwrap.wrap` now attempts to break long words after
10887 - bpo-35823: Use ``vfork()`` instead of ``fork()`` for
10889   is deemed safe.
10891 - bpo-42043: Add support for ``zipfile.Path`` inheritance.
10892   ``zipfile.Path.is_file()`` now returns False for non-existent names.
10894   that to resolve ``.name`` and ``.parent`` when the ``Path`` object is at
10897 - bpo-42021: Fix possible ref leaks in :mod:`sqlite3` module init.
10899 - bpo-39101: Fixed tests using IsolatedAsyncioTestCase from hanging on
10902 - bpo-41976: Fixed a bug that was causing :func:`ctypes.util.find_library`
10904   gcc>=9 is available and ``ldconfig`` is not. Patch by Pablo Galindo
10906 - bpo-41943: Fix bug where TestCase.assertLogs doesn't correctly filter
10909 - bpo-41923: Implement :pep:`613`, introducing :data:`typing.TypeAlias`
10912 - bpo-41905: A new function in abc: *update_abstractmethods* to re-calculate
10916 - bpo-23706: Added *newline* parameter to ``pathlib.Path.write_text()``.
10918 - bpo-41876: Tkinter font class repr uses font name
10920 - bpo-41831: ``str()`` for the ``type`` attribute of the ``tkinter.Event``
10924 - bpo-39337: :func:`encodings.normalize_encoding` now ignores non-ASCII
10927 - bpo-41747: Ensure all methods that generated from
10931 - bpo-30681: Handle exceptions caused by unparsable date headers when using
10934 - bpo-41586: Add F_SETPIPE_SZ and F_GETPIPE_SZ to fcntl module. Allow
10937 - bpo-41229: Add ``contextlib.aclosing`` for deterministic cleanup of async
10938   generators which is analogous to ``contextlib.closing`` for non-async
10941 - bpo-16396: Allow ``ctypes.wintypes`` to be imported on non-Windows
10944 - bpo-4356: Add a key function to the bisect module.
10946 - bpo-40592: :func:`shutil.which` now ignores empty entries in
10949 - bpo-40492: Fix ``--outfile`` for :mod:`cProfile` / :mod:`profile` not
10953 - bpo-34204: The :mod:`shelve` module now uses
10957 - bpo-27321: Fixed KeyError exception when flattening an email to a string
10958   attempts to replace a non-existent Content-Transfer-Encoding header.
10960 - bpo-38976: The :mod:`http.cookiejar` module now supports the parsing of
10961   cookies in CURL-style cookiejar files through MozillaCookieJar on all
10965   Additionally, the HTTP Only attribute is persisted in the object, and will
10966   be correctly written to file if the MozillaCookieJar object is
10970 -------------
10972 - bpo-42061: Document __format__ functionality for IP addresses.
10974 - bpo-41910: Document the default implementation of `object.__eq__`.
10976 - bpo-42010: Clarify that subscription expressions are also valid for
10978   library, and for user-defined classes and types if the classmethod
10979   :meth:`__class_getitem__` is provided.
10981 - bpo-41805: Documented :ref:`generic alias type <types-genericalias>` and
10985 - bpo-39693: Fix tarfile's extractfile documentation
10987 - bpo-39416: Document some restrictions on the default string
10991 -----
10993 - bpo-41739: Fix test_logging.test_race_between_set_target_and_flush(): the
10997 - bpo-41970: Avoid a test failure in ``test_lib2to3`` if the module has
11000 - bpo-41944: Tests for CJK codecs no longer call ``eval()`` on content
11003 - bpo-41306: Fixed a failure in ``test_tk.test_widgets.ScaleTest`` happening
11007 -----
11009 - bpo-38980: Add ``-fno-semantic-interposition`` to both the compile and
11010   link line when building with ``--enable-optimizations``. Patch by Victor
11014 -------
11016 - bpo-38439: Updates the icons for IDLE in the Windows Store package.
11018 - bpo-38252: Use 8-byte step to detect ASCII sequence in 64-bit Windows
11021 - bpo-39107: Update Tcl and Tk to 8.6.10 in Windows installer.
11023 - bpo-41557: Update Windows installer to use SQLite 3.33.0.
11025 - bpo-38324: Avoid Unicode errors when accessing certain locale data on
11029 -----
11031 - bpo-41471: Ignore invalid prefix lengths in system proxy excludes.
11034 ----
11036 - bpo-33987: Mostly finish using ttk widgets, mainly for editor, settings,
11039 - bpo-40511: Typing opening and closing parentheses inside the parentheses
11041   of an existing open call-tip, e.g. when typed in a string literal.
11043 - bpo-38439: Add a 256×256 pixel IDLE icon to the Windows .ico file. Created
11044   by Andrew Clover. Remove the low-color gif variations from the .ico file.
11047 -----
11049 - bpo-42157: The private ``_PyUnicode_Name_CAPI`` structure of the PyCapsule
11053 - bpo-42015: Fix potential crash in deallocating method objects when
11054   dynamically allocated `PyMethodDef`'s lifetime is managed through the
11057 - bpo-40423: The :mod:`subprocess` module and ``os.closerange`` will now use
11058   the ``close_range(low, high, flags)`` syscall when it is available for
11061 - bpo-41845: :c:func:`PyObject_GenericGetDict` is available again in the
11064 - bpo-40422: Add `_Py_closerange` function to provide performant closing of
11067 - bpo-41986: :c:data:`Py_FileSystemDefaultEncodeErrors` and
11070 - bpo-41756: Add `PyIter_Send` function to allow sending value into
11074 - bpo-41784: Added ``PyUnicode_AsUTF8AndSize`` to the limited C API.
11080 *Release date: 2020-10-05*
11083 --------
11085 - bpo-41304: Fixes `python3x._pth` being ignored on Windows, caused by the
11086   fix for :issue:`29778` (CVE-2020-15801).
11088 - bpo-41162: Audit hooks are now cleared later during finalization to avoid
11091 - bpo-29778: Ensure :file:`python3.dll` is loaded from correct locations
11092   when Python is embedded (CVE-2020-15523).
11094 - bpo-41004: The __hash__() methods of  ipaddress.IPv4Interface and
11100 - bpo-39603: Prevent http header injection by rejecting control characters
11104 -----------------
11106 - bpo-41909: Fixed stack overflow in :func:`issubclass` and
11110 - bpo-41922: Speed up calls to ``reversed()`` by using the :pep:`590`
11111   ``vectorcall`` calling convention. Patch by Dong-hee Na.
11113 - bpo-41873: Calls to ``float()`` are now faster due to the ``vectorcall``
11116 - bpo-41870: Speed up calls to ``bool()`` by using the :pep:`590`
11117   ``vectorcall`` calling convention. Patch by Dong-hee Na.
11119 - bpo-1635741: Port the :mod:`_bisect` module to the multi-phase
11122 - bpo-39934: Correctly count control blocks in 'except' in compiler. Ensures
11126 - bpo-41780: Fix :meth:`__dir__` of :class:`types.GenericAlias`. Patch by
11129 - bpo-1635741: Port the :mod:`_lsprof` extension module to multi-phase
11132 - bpo-1635741: Port the :mod:`cmath` extension module to multi-phase
11135 - bpo-1635741: Port the :mod:`_scproxy` extension module to multi-phase
11138 - bpo-1635741: Port the :mod:`termios` extension module to multi-phase
11141 - bpo-1635741: Convert the :mod:`_sha256` extension module types to heap
11144 - bpo-41690: Fix a possible stack overflow in the parser when parsing
11148 - bpo-1635741: Port the :mod:`_overlapped` extension module to multi-phase
11151 - bpo-1635741: Port the :mod:`_curses_panel` extension module to multi-phase
11154 - bpo-1635741: Port the :mod:`_opcode` extension module to multi-phase
11157 - bpo-41681: Fixes the wrong error description in the error raised by using
11158   2 `,` in format string in f-string and :meth:`str.format`.
11160 - bpo-41675: The implementation of :func:`signal.siginterrupt` now uses
11161   :c:func:`sigaction` (if it is available in the system) instead of the
11164 - bpo-41670: Prevent line trace being skipped on platforms not compiled with
11166   try-except block were not being traced on Windows.
11168 - bpo-41654: Fix a crash that occurred when destroying subclasses of
11171 - bpo-1635741: Port the :mod:`zlib` extension module to multi-phase
11174 - bpo-41631: The ``_ast`` module uses again a global state. Using a module
11175   state per module instance is causing subtle practical problems. For
11180 - bpo-40077: Convert :mod:`_operator` to use :c:func:`PyType_FromSpec`.
11182 - bpo-1653741: Port :mod:`_sha3` to multi-phase init.  Convert static types
11185 - bpo-1635741: Port the :mod:`_blake2` extension module to the multi-phase
11188 - bpo-41533: Free the stack allocated in ``va_build_stack`` if
11189   ``do_mkstack`` fails and the stack is not a ``small_stack``.
11191 - bpo-41531: Fix a bug that was dropping keys when compiling dict literals
11194 - bpo-41525: The output of ``python --help`` contains now only ASCII
11197 - bpo-1635741: Port the :mod:`_sha1`, :mod:`_sha512`, and :mod:`_md5`
11198   extension modules to multi-phase initialization API (:pep:`489`).
11200 - bpo-41431: Optimize ``dict_merge()`` for copying dict (e.g. ``dict(d)``
11203 - bpo-41428: Implement PEP 604. This supports (int | str) etc. in place of
11206 - bpo-41340: Removed fallback implementation for ``strdup``.
11208 - bpo-38156: Handle interrupts that come after EOF correctly in
11211 - bpo-41342: :func:`round` with integer argument is now faster (9--60%).
11213 - bpo-41334: Constructors :func:`str`, :func:`bytes` and :func:`bytearray`
11214   are now faster (around 30--40% for small objects).
11216 - bpo-41295: Resolve a regression in CPython 3.8.4 where defining
11217   "__setattr__" in a multi-inheritance setup and calling up the hierarchy
11221 - bpo-41323: Bytecode optimizations are performed directly on the control
11225 - bpo-41247: Always cache the running loop holder when running
11228 - bpo-41252: Fix incorrect refcounting in _ssl.c's
11231 - bpo-1635741: Port :mod:`multiprocessing` to multi-phase initialization
11233 - bpo-1635741: Port :mod:`winapi` to multiphase initialization
11235 - bpo-41215: Use non-NULL default values in the PEG parser keyword list to
11239 - bpo-41218: Python 3.8.3 had a regression where compiling with
11244 - bpo-1635741: Port :mod:`faulthandler` to multiphase initialization.
11246 - bpo-1635741: Port :mod:`sha256` to multiphase initialization
11248 - bpo-41175: Guard against a NULL pointer dereference within bytearrayobject
11251 - bpo-41100: add arm64 to the allowable Mac OS arches in mpdecimal.h
11253 - bpo-41094: Fix decoding errors with audit when open files with non-ASCII
11254   names on non-UTF-8 locale.
11256 - bpo-39960: The "hackcheck" that prevents sneaking around a type's
11260 - bpo-41084: Prefix the error message with 'f-string: ', when parsing an
11261   f-string expression which throws a :exc:`SyntaxError`.
11263 - bpo-40521: Empty frozensets are no longer singletons.
11265 - bpo-41076: Pre-feed the parser with the location of the f-string
11266   expression, not the f-string itself, which allows us to skip the shifting
11267   of the AST node locations after the parsing is completed.
11269 - bpo-41056: Fixes a reference to deallocated stack space during startup
11271   supplied via -c.  (discovered via Coverity)
11273 - bpo-41061: Fix incorrect expressions and asserts in hashtable code and
11276 - bpo-41052: Opt out serialization/deserialization for _random.Random
11278 - bpo-40939: Rename `PyPegen*` functions to `PyParser*`, so that we can
11280   parser, but keep everything backwards-compatible.
11282 - bpo-35975: Stefan Behnel reported that cf_feature_version is used even
11283   when PyCF_ONLY_AST is not set. This is against the intention and against
11286 - bpo-40939: Remove the remaining files from the old parser and the
11289 - bpo-40077: Convert :mod:`_bz2` to use :c:func:`PyType_FromSpec`.
11291 - bpo-41006: The ``encodings.latin_1`` module is no longer imported at
11292   startup. Now it is only imported when it is the filesystem encoding or the
11295 - bpo-40636: :func:`zip` now supports :pep:`618`'s ``strict`` parameter,
11299 - bpo-1635741: Port :mod:`_gdbm` to multiphase initialization.
11301 - bpo-40985: Fix a bug that caused the :exc:`SyntaxError` text to be empty
11305 - bpo-40958: Fix a possible buffer overflow in the PEG parser when gathering
11308 - bpo-1635741: Port :mod:`_dbm` to multiphase initialization.
11310 - bpo-40957: Fix refleak in _Py_fopen_obj() when PySys_Audit() fails
11312 - bpo-40950: Add a state to the :mod:`nis` module (:pep:`3121`) and apply
11313   the multiphase initialization. Patch by Dong-hee Na.
11315 - bpo-40947: The Python :ref:`Path Configuration <init-path-config>` now
11318 - bpo-40939: Remove the old parser, the :mod:`parser` module and all
11319   associated support code, command-line options and environment variables.
11322 - bpo-40847: Fix a bug where a line with only a line continuation character
11323   is not considered a blank line at tokenizer level. In such cases, more
11329 - bpo-40890: Each dictionary view now has a ``mapping`` attribute that
11333 - bpo-40889: Improved the performance of symmetric difference operations on
11336 - bpo-40904: Fix possible segfault in the new PEG parser when parsing
11337   f-string containing yield statements with no value (:code:`f"{yield}"`).
11340 - bpo-40903: Fixed a possible segfault in the new PEG parser when producing
11344 - bpo-40880: Fix invalid memory read in the new parser when checking
11347 - bpo-40883: Fix memory leak in when parsing f-strings in the new parser.
11350 - bpo-40870: Raise :exc:`ValueError` when validating custom AST's where the
11354 - bpo-40854: Allow overriding :data:`sys.platlibdir` via a new
11357 - bpo-40826: Fix GIL usage in :c:func:`PyOS_Readline`: lock the GIL to set
11358   an exception and pass the Python thread state when checking if there is a
11361 - bpo-1635741: Port :mod:`fcntl` to multiphase initialization.
11363 - bpo-19468: Delete unnecessary instance check in importlib.reload(). Patch
11366 - bpo-40824: Unexpected errors in calling the ``__iter__`` method are no
11371 - bpo-40792: Attributes ``start``, ``stop`` and ``step`` of the
11375 - bpo-40780: Fix a corner case where g-style string formatting of a float
11378 - bpo-38964: When there's a :exc:`SyntaxError` in the expression part of an
11382 - bpo-40750: Support the "-d" debug flag in the new PEG parser. Patch by
11385 - bpo-40217: Instances of types created with
11388   The user is expected to manually visit the object's class. Patch by Pablo
11391 - bpo-39573: :c:func:`Py_TYPE()` is changed to the inline static function.
11392   Patch by Dong-hee Na.
11394 - bpo-40696: Fix a hang that can arise after :meth:`generator.throw` due to
11397 - bpo-40521: Each interpreter now its has own free lists, singletons and
11408 - bpo-40679: Certain :exc:`TypeError` messages about missing or extra
11412 - bpo-29590: Make the stack trace correct after calling
11416 - bpo-4022: Improve performance of generators by not raising internal
11419 - bpo-1635741: Port :mod:`mmap` to multiphase initialization.
11421 - bpo-1635741: Port :mod:`_lzma` to multiphase initialization.
11423 - bpo-37999: Builtin and extension functions that take integer arguments no
11429 - bpo-29882: Add :meth:`int.bit_count()`, counting the number of ones in the
11432 - bpo-36982: Use ncurses extended color functions when available to support
11435   color support is provided by the underlying ncurses library.
11437 - bpo-19569: Add the private macros ``_Py_COMP_DIAG_PUSH``,
11440 - bpo-26680: The int type now supports the x.is_integer() method for
11444 -------
11446 - bpo-41900: C14N 2.0 serialisation in xml.etree.ElementTree failed for
11449 - bpo-41887: Strip leading spaces and tabs on :func:`ast.literal_eval`. Also
11452 - bpo-41773: Note in documentation that :func:`random.choices` doesn't
11453   support non-finite weights, raise :exc:`ValueError` when given non-finite
11456 - bpo-41840: Fix a bug in the :mod:`symtable` module that was causing
11457   module-scope global variables to not be reported as both local and global.
11460 - bpo-41842: Add :func:`codecs.unregister` function to unregister a codec
11463 - bpo-40564: In ``zipfile.Path``, mutate the passed ZipFile object type
11467 - bpo-40670: More reliable validation of statements in
11471 - bpo-41833: The :class:`threading.Thread` constructor now uses the target
11472   name if the *target* argument is specified but the *name* argument is
11475 - bpo-41817: fix `tkinter.EventType` Enum so all members are strings, and
11478 - bpo-41810: :data:`types.EllipsisType`, :data:`types.NotImplementedType`
11482 - bpo-41815: Fix SQLite3 segfault when backing up closed database. Patch
11485 - bpo-41816: StrEnum added: it ensures that all members are already strings
11488 - bpo-41517: fix bug allowing Enums to be extended via multiple inheritance
11490 - bpo-39587: use the correct mix-in data type when constructing Enums
11492 - bpo-41792: Add is_typeddict function to typing.py to check if a type is a
11499 - bpo-41789: Honor `object` overrides in `Enum` class creation
11502 - bpo-32218: `enum.Flag` and `enum.IntFlag` members are now iterable
11504 - bpo-39651: Fix a race condition in the ``call_soon_threadsafe()`` method
11505   of ``asyncio.ProactorEventLoop``: do nothing if the self-pipe socket has
11508 - bpo-1635741: Port the ``mashal`` extension module to the multi-phase
11511 - bpo-1635741: Port the ``_string`` extension module to the multi-phase
11514 - bpo-41732: Added an :term:`iterator` to :class:`memoryview`.
11516 - bpo-41720: Fixed :meth:`turtle.Vec2D.__rmul__` for arguments which are not
11519 - bpo-41696: Fix handling of debug mode in :func:`asyncio.run`. This allows
11520   setting ``PYTHONASYNCIODEBUG`` or ``-X dev`` to enable asyncio debug mode
11523 - bpo-41687: Fix implementation of sendfile to be compatible with Solaris.
11525 - bpo-41662: No longer override exceptions raised in ``__len__()`` of a
11529 - bpo-39010: Restarting a ``ProactorEventLoop`` on Windows no longer logs
11532 - bpo-41638: :exc:`~sqlite3.ProgrammingError` message for absent parameter
11536 - bpo-41662: Fixed crash when mutate list of parameters during iteration in
11539 - bpo-41513: Improved the accuracy of math.hypot().  Internally, each step
11540   is computed with extra precision so that the result is now almost always
11543 - bpo-41609: The pdb whatis command correctly reports instance methods as
11546 - bpo-39994: Fixed pprint's handling of dict subclasses that override
11549 - bpo-32751: When cancelling the task due to a timeout,
11550   :meth:`asyncio.wait_for` will now wait until the cancellation is complete
11551   also in the case when *timeout* is <= 0, like it does with positive
11554 - bpo-37658: :meth:`asyncio.wait_for` now properly handles races between
11557 - bpo-40782: Change the method asyncio.AbstractEventLoop.run_in_executor to
11560 - bpo-41520: Fix :mod:`codeop` regression that prevented turning compile
11563 - bpo-41528: turtle uses math module functions to convert degrees to radians
11566 - bpo-41513: Minor algorithmic improvement to math.hypot() and math.dist()
11569 - bpo-41503: Fixed a race between setTarget and flush in
11572 - bpo-41497: Fix potential UnicodeDecodeError in dis module.
11574 - bpo-41467: On Windows, fix asyncio ``recv_into()`` return value when the
11575   socket/pipe is closed (:exc:`BrokenPipeError`): return ``0`` rather than
11578 - bpo-41425: Make tkinter doc example runnable.
11580 - bpo-41421: Make an algebraic simplification to random.paretovariate().  It
11581   now is slightly less subject to round-off error and is slightly faster.
11585 - bpo-41440: Add :func:`os.cpu_count()` support for VxWorks RTOS.
11587 - bpo-41316: Fix the :mod:`tarfile` module to write only basename of TAR
11590 - bpo-41384: Raise TclError instead of TypeError when an unknown option is
11593 - bpo-41317: Use add_done_callback() in asyncio.loop.sock_accept() to
11596 - bpo-41364: Reduce import overhead of :mod:`uuid`.
11598 - bpo-35328: Set the environment variable ``VIRTUAL_ENV_PROMPT`` at
11601 - bpo-41341: Recursive evaluation of `typing.ForwardRef` in
11604 - bpo-41344: Prevent creating :class:`shared_memory.SharedMemory` objects
11607 - bpo-41333: :meth:`collections.OrderedDict.pop` is now 2 times faster.
11609 - bpo-41288: Unpickling invalid NEWOBJ_EX opcode with the C implementation
11612 - bpo-39017: Avoid infinite loop when reading specially crafted TAR files
11613   using the tarfile module (CVE-2019-20907).
11615 - bpo-41273: Speed up any transport using ``_ProactorReadPipeTransport`` by
11619 - bpo-41235: Fix the error handling in
11622 - bpo-41207: In distutils.spawn, restore expectation that DistutilsExecError
11623   is raised when the command is not found.
11625 - bpo-29727: Register :class:`array.array` as a
11628 - bpo-39168: Remove the ``__new__`` method of :class:`typing.Generic`.
11630 - bpo-41194: Fix a crash in the ``_ast`` module: it can no longer be loaded
11633 - bpo-41195: Add read-only ssl.SSLContext.security_level attribute to
11636 - bpo-41193: The ``write_history()`` atexit function of the readline
11638   is read-only, instead of only ignoring :exc:`FileNotFoundError` and
11641 - bpo-41182: selector: use DefaultSelector based upon implementation
11643 - bpo-41161: The decimal module now requires libmpdec-2.5.0. Users of
11644   --with-system-libmpdec should update their system library.
11646 - bpo-40874: The decimal module now requires libmpdec-2.5.0.
11648 - bpo-41138: Fixed the :mod:`trace` module CLI for Python source files with
11649   non-UTF-8 encoding.
11651 - bpo-31082: Use the term "iterable" in the docstring for
11654 - bpo-40521: Remove freelist from collections.deque().
11656 - bpo-31938: Fix default-value signatures of several functions in the
11657   :mod:`select` module - by Anthony Sottile.
11659 - bpo-41068: Fixed reading files with non-ASCII names from ZIP archive
11662 - bpo-41058: :func:`pdb.find_function` now correctly determines the source
11665 - bpo-41056: Invalid file descriptor values are now prevented from being
11668 - bpo-41056: Fix a NULL pointer dereference within the ssl module during a
11671 - bpo-41056: Fixed an instance where a MemoryError within the zoneinfo
11675 - bpo-41048: :func:`mimetypes.read_mime_types` function reads the rule file
11676   using UTF-8 encoding, not the locale encoding. Patch by Srinivas Reddy
11679 - bpo-41043: Fixed the use of :func:`~glob.glob` in the stdlib: literal part
11680   of the path is now always correctly escaped.
11682 - bpo-41025: Fixed an issue preventing the C implementation of
11685 - bpo-35018: Add the :class:`xml.sax.handler.LexicalHandler` class that is
11688 - bpo-41002: Improve performance of HTTPResponse.read with a given amount.
11691 - bpo-40448: :mod:`ensurepip` now disables the use of `pip` cache when
11695 - bpo-40967: Removed :meth:`asyncio.Task.current_task` and
11698 - bpo-40924: Ensure ``importlib.resources.path`` returns an extant path for
11700   in master while a long-term solution is devised.
11702 - bpo-40955: Fix a minor memory leak in :mod:`subprocess` module when
11705 - bpo-40855: The standard deviation and variance functions in the statistics
11708 - bpo-40939: Use the new PEG parser when generating the stdlib
11711 - bpo-23427: Add :data:`sys.orig_argv` attribute: the list of the original
11714 - bpo-33689: Ignore empty or whitespace-only lines in .pth files. This
11716   site-packages dir to appear multiple times in sys.path. By Ido Michael,
11719 - bpo-40884: Added a `defaults` parameter to :class:`logging.Formatter`, to
11723 - bpo-40876: Clarify error message in the :mod:`csv` module.
11725 - bpo-39791: Refresh importlib.metadata from importlib_metadata 1.6.1.
11727 - bpo-40807: Stop codeop._maybe_compile, used by code.InteractiveInterpreter
11730 - bpo-32604: Fix reference leak in the :mod:`select` module when the module
11731   is imported in a subinterpreter.
11733 - bpo-39791: Built-in loaders (SourceFileLoader and ZipImporter) now supply
11737 - bpo-39314: :class:`rlcompleter.Completer` and the standard Python shell
11741 - bpo-17005: The topological sort functionality that was introduced
11746 - bpo-40834: Fix truncate when sending str object
11749 - bpo-40755: Add rich comparisons to collections.Counter().
11751 - bpo-26407: Unexpected errors in calling the ``__iter__`` method are no
11755 - bpo-39384: Fixed email.contentmanager to allow set_content() to set a null
11758 - bpo-40744: The :mod:`sqlite3` module uses SQLite API functions that
11763 - bpo-40777: Initialize PyDateTime_IsoCalendarDateType.tp_base at run-time
11766 - bpo-38488: Update ensurepip to install pip 20.1.1 and setuptools 47.1.0.
11768 - bpo-40792: The result of :func:`operator.index` now always has exact type
11772 - bpo-40767: :mod:`webbrowser` now properly finds the default browser in
11776 - bpo-40791: :func:`hashlib.compare_digest` uses OpenSSL's
11777   ``CRYPTO_memcmp()`` function when OpenSSL is available.
11779 - bpo-40795: :mod:`ctypes` module: If ctypes fails to convert the result of
11781   sys.unraisablehook is now called with an exception set. Previously, the
11784 - bpo-16995: Add :func:`base64.b32hexencode` and :func:`base64.b32hexdecode`
11787 - bpo-30008: Fix :mod:`ssl` code to be compatible with OpenSSL 1.1.x builds
11788   that use ``no-deprecated`` and ``--api=1.1.0``.
11790 - bpo-30064: Fix asyncio ``loop.sock_*`` race condition issue
11792 - bpo-40759: Deprecate the :mod:`symbol` module.
11794 - bpo-40756: The second argument (extra) of ``LoggerAdapter.__init__`` now
11797 - bpo-37129: Add a new :data:`os.RWF_APPEND` flag for :func:`os.pwritev`.
11799 - bpo-40737: Fix possible reference leak for :mod:`sqlite3` initialization.
11801 - bpo-40726: Handle cases where the ``end_lineno`` is ``None`` on
11804 - bpo-40698: :mod:`distutils` upload creates SHA2-256 and Blake2b-256
11805   digests. MD5 digests is skipped if platform blocks MD5.
11807 - bpo-40695: :mod:`hashlib` no longer falls back to builtin hash
11808   implementations when OpenSSL provides a hash digest and the algorithm is
11811 - bpo-9216: func:`hashlib.new` passed ``usedforsecurity`` to OpenSSL EVP
11815 - bpo-40614: :func:`ast.parse` will not parse self documenting expressions
11816   in f-strings when passed ``feature_version`` is less than ``(3, 8)``.
11818 - bpo-40626: Add h5 file extension as MIME Type application/x-hdf5, as per
11822 - bpo-25920: On macOS, when building Python for macOS 10.4 and older, which
11825   ``getaddrinfo()`` which is thread-safe since macOS 10.5. Python 3.9
11831 - bpo-40671: Prepare ``_hashlib`` for :pep:`489` and use
11834 - bpo-32309: Added a new :term:`coroutine` :func:`asyncio.to_thread`. It is
11835   mainly used for running IO-bound functions in a separate thread to avoid
11836   blocking the event loop, and essentially works as a high-level version of
11840 - bpo-36543: Restored the deprecated :mod:`xml.etree.cElementTree` module.
11842 - bpo-40611: :data:`~mmap.MAP_POPULATE` constant has now been added to the
11845 - bpo-39881: PEP 554 for use in the test suite. (Patch By Joannah Nanjekye)
11847 - bpo-13097: ``ctypes`` now raises an ``ArgumentError`` when a callback is
11850 - bpo-39385: A new test assertion context-manager,
11854 - bpo-23082: Updated the error message and docs of PurePath.relative_to() to
11857 - bpo-40318: Use SQLite3 trace v2 API, if it is available.
11859 - bpo-40105: ZipFile truncates files to avoid corruption when a shorter
11860   comment is provided in append ("a") mode. Patch by Jan Mazur.
11862 - bpo-40084: Fix ``Enum.__dir__``: dir(Enum.member) now includes attributes
11865 - bpo-31122: ssl.wrap_socket() now raises ssl.SSLEOFError rather than
11868 - bpo-39728: fix default `_missing_` so a duplicate `ValueError` is not set
11871 - bpo-39244: Fixed :class:`multiprocessing.context.get_all_start_methods` to
11874 - bpo-39040: Fix parsing of invalid mime headers parameters by collapsing
11875   whitespace between encoded words in a bare-quote-string.
11877 - bpo-38731: Add ``--quiet`` option to command-line interface of
11880 - bpo-35714: :exc:`struct.error` is now raised if there is a null character
11883 - bpo-38144: Added the *root_dir* and *dir_fd* parameters in
11886 - bpo-26543: Fix :meth:`IMAP4.noop()` when debug mode is enabled (ex:
11889 - bpo-12178: :func:`csv.writer` now correctly escapes *escapechar* when
11893 - bpo-36290: AST nodes are now raising :exc:`TypeError` on conflicting
11896 - bpo-33944: Added site.py site-packages tracing in verbose mode.
11898 - bpo-35078: Refactor formatweekday, formatmonthname methods in
11903 - bpo-29620: :func:`~unittest.TestCase.assertWarns` no longer raises a
11905   causes importation of a new module, or when a new module is imported in
11908 - bpo-31844: Remove ``ParserBase.error()`` method from the private and
11909   undocumented ``_markupbase`` module.  :class:`html.parser.HTMLParser` is
11913 - bpo-34226: Fix `cgi.parse_multipart` without content_length. Patch by
11916 - bpo-33660: Fix pathlib.PosixPath to resolve a relative path located on the
11919 - bpo-28557: Improve the error message for a misbehaving ``rawio.readinto``
11921 - bpo-26680: The d.is_integer() method is added to the Decimal type, for
11924 - bpo-26680: The x.is_integer() method is incorporated into the abstract
11929 -------------
11931 - bpo-41428: Add documentation for :pep:`604` (Allow writing union types as
11934 - bpo-41774: In Programming FAQ "Sequences (Tuples/Lists)" section, add "How
11937 - bpo-35293: Fix RemovedInSphinx40Warning when building the documentation.
11938   Patch by Dong-hee Na.
11940 - bpo-37149: Change Shipman tkinter doc link from archive.org to TkDocs.
11944 - bpo-41726: Update the refcounts info of ``PyType_FromModuleAndSpec``.
11946 - bpo-41624: Fix the signature of :class:`typing.Coroutine`.
11948 - bpo-40204: Enable Sphinx 3.2 ``c_allow_pre_v3`` option and disable
11952 - bpo-41045: Add documentation for debug feature of f-strings.
11954 - bpo-41314: Changed the release when ``from __future__ import annotations``
11958 - bpo-40979: Refactored typing.rst, arranging more than 70 classes,
11959   functions, and decorators into new sub-sections.
11961 - bpo-40552: Fix in tutorial section 4.2. Code snippet is now correct.
11963 - bpo-39883: Make code, examples, and recipes in the Python documentation be
11967 - bpo-37703: Updated Documentation to comprehensively elaborate on the
11971 -----
11973 - bpo-41939: Fix test_site.test_license_exists_at_url(): call
11977 - bpo-41731: Make test_cmd_line_script pass with option '-vv'.
11979 - bpo-41602: Add tests for SIGINT handling in the runpy module.
11981 - bpo-41521: :mod:`test.support`: Rename ``blacklist`` parameter of
11984 - bpo-41477: Make ctypes optional in test_genericalias.
11986 - bpo-41085: Fix integer overflow in the :meth:`array.array.index` method on
11987   64-bit Windows for index larger than ``2**31``.
11989 - bpo-41069: :data:`test.support.TESTFN` and the current directory for tests
11990   when run via ``test.regrtest`` contain now non-ascii characters if
11993 - bpo-38377: On Linux, skip tests using multiprocessing if the current user
11998 - bpo-41009: Fix use of ``support.require_{linux|mac|freebsd}_version()``
12001 - bpo-41003: Fix ``test_copyreg`` when ``numpy`` is installed:
12005 - bpo-40964: Disable remote :mod:`imaplib` tests, host cyrus.andrew.cmu.edu
12006   is blocking incoming connections.
12008 - bpo-40927: Fix test_binhex when run twice: it now uses
12012 - bpo-17258: Skip some :mod:`multiprocessing` tests when MD5 hash digest is
12015 - bpo-31904: Increase LOOPBACK_TIMEOUT to 10 for VxWorks RTOS.
12017 - bpo-38169: Increase code coverage for SharedMemory and ShareableList
12019 - bpo-34401: Make test_gdb properly run on HP-UX. Patch by Michael Osipov.
12022 -----
12024 - bpo-38249: Update :c:macro:`Py_UNREACHABLE` to use __builtin_unreachable()
12025   if only the compiler is able to use it. Patch by Dong-hee Na.
12027 - bpo-41617: Fix ``pycore_bitutils.h`` header file to support old clang
12028   versions: ``__builtin_bswap16()`` is not available in LLVM clang 3.0.
12030 - bpo-40204: Pin Sphinx version to 2.3.1 in ``Doc/Makefile``.
12032 - bpo-36020: The C99 functions :c:func:`snprintf` and :c:func:`vsnprintf`
12035 - bpo-40684: ``make install`` now uses the ``PLATLIBDIR`` variable for the
12036   destination ``lib-dynload/`` directory when ``./configure
12037   --with-platlibdir`` is used.
12039 - bpo-40683: Fixed an issue where the :mod:`zoneinfo` module and its tests
12040   were not included when Python is installed with ``make``.
12043 -------
12045 - bpo-41744: Fixes automatic import of props file when using the Nuget
12048 - bpo-41627: The user site directory for 32-bit now includes a ``-32``
12049   suffix to distinguish it from the 64-bit interpreter's directory.
12051 - bpo-41526: Fixed layout of final page of the installer by removing the
12054 - bpo-41492: Fixes the description that appears in UAC prompts.
12056 - bpo-40948: Improve post-install message to direct people to the "py"
12059 - bpo-41412: The installer will now fail to install on Windows 7 and Windows
12060   8. Further, the UCRT dependency is now always downloaded on demand.
12062 - bpo-40741: Update Windows release to include SQLite 3.32.3.
12064 - bpo-41142: :mod:`msilib` now supports creating CAB files with non-ASCII
12065   file path and adding files with non-ASCII file path to them.
12067 - bpo-41074: Fixed support of non-ASCII names in functions
12068   :func:`msilib.OpenDatabase` and :func:`msilib.init_database` and non-ASCII
12071 - bpo-41039: Stable ABI redirection DLL (python3.dll) now uses ``#pragma
12072   comment(linker)`` for re-exporting.
12074 - bpo-40164: Updates Windows OpenSSL to 1.1.1g
12076 - bpo-39631: Changes the registered MIME type for ``.py`` files on Windows
12077   to ``text/x-python`` instead of ``text/plain``.
12079 - bpo-40677: Manually define IO_REPARSE_TAG_APPEXECLINK in case some old
12082 - bpo-37556: Extend py.exe help to mention overrides via venv, shebang,
12086 -----
12088 - bpo-41557: Update macOS installer to use SQLite 3.33.0.
12090 - bpo-39580: Avoid opening Finder window if running installer from the
12093 - bpo-41100: Fix configure error when building on macOS 11. Note that the
12096   and running on the developer preview. Big Sur is expected to be fully
12099 - bpo-40741: Update macOS installer to use SQLite 3.32.3.
12101 - bpo-41005: fixed an XDG settings issue not allowing macos to open browser
12104 - bpo-40741: Update macOS installer to use SQLite 3.32.2.
12107 ----
12109 - bpo-41775: Use 'IDLE Shell' as shell title
12111 - bpo-35764: Rewrite the Calltips doc section.
12113 - bpo-40181: In calltips, stop reminding that '/' marks the end of
12114   positional-only arguments.
12116 - bpo-41468: Improve IDLE run crash error message (which users should never
12119 - bpo-41373: Save files loaded with no line ending, as when blank, or
12123 - bpo-41300: Save files with non-ascii chars. Fix regression released in
12126 - bpo-37765: Add keywords to module name completion list.  Rewrite
12129 - bpo-41152: The encoding of ``stdin``, ``stdout`` and ``stderr`` in IDLE is
12130   now always UTF-8.
12132 - bpo-41144: Make Open Module open a special module such as os.path.
12134 - bpo-39885: Make context menu Cut and Copy work again when right-clicking
12137 - bpo-40723: Make test_idle pass when run after import.
12140 -----
12142 - bpo-41936: Removed undocumented macros ``Py_ALLOW_RECURSION`` and
12146 - bpo-41692: The ``PyUnicode_InternImmortal()`` function is now deprecated
12150 - bpo-41842: Add :c:func:`PyCodec_Unregister` function to unregister a codec
12153 - bpo-41834: Remove the ``_Py_CheckRecursionLimit`` variable: it has been
12157 - bpo-41689: Types created with :c:func:`PyType_FromSpec` now make any
12160 - bpo-41524: Fix bug in PyOS_mystrnicmp and PyOS_mystricmp that incremented
12163 - bpo-41324: Add a minimal decimal capsule API.  The API supports fast
12167 - bpo-30155: Add :c:func:`PyDateTime_DATE_GET_TZINFO` and
12172 - bpo-40170: Revert :c:func:`PyType_HasFeature` change: it reads again
12174   API is not used, rather than always calling :c:func:`PyType_GetFlags`
12177 - bpo-41123: Remove ``PyUnicode_AsUnicodeCopy``.
12179 - bpo-41123: Removed ``PyLong_FromUnicode()``.
12181 - bpo-41123: Removed ``PyUnicode_GetMax()``.
12183 - bpo-41123: Removed ``Py_UNICODE_str*`` functions manipulating
12186 - bpo-41103: ``PyObject_AsCharBuffer()``, ``PyObject_AsReadBuffer()``,
12191 - bpo-36346: Raises DeprecationWarning for ``PyUnicode_FromUnicode(NULL,
12194 - bpo-36346: Mark ``Py_UNICODE_COPY``, ``Py_UNICODE_FILL``,
12200 - bpo-40989: The :c:func:`PyObject_INIT` and :c:func:`PyObject_INIT_VAR`
12204 - bpo-36020: On Windows, ``#include "pyerrors.h"`` no longer defines
12207 - bpo-40943: The ``PY_SSIZE_T_CLEAN`` macro must now be defined to use
12210   ``Z#``. See :ref:`Parsing arguments and building values <arg-parsing>` and
12213 - bpo-40910: Export explicitly the :c:func:`Py_GetArgcArgv` function to the
12215   which no longer works since Python is built with ``-fvisibility=hidden``.
12217 - bpo-40724: Allow defining buffer slots in type specs.
12219 - bpo-40679: Fix a ``_PyEval_EvalCode()`` crash if *qualname* argument is
12222 - bpo-40839: Calling :c:func:`PyDict_GetItem` without :term:`GIL` held had
12223   been allowed for historical reason. It is no longer allowed.
12225 - bpo-40826: :c:func:`PyOS_InterruptOccurred` now fails with a fatal error
12226   if it is called with the GIL released.
12228 - bpo-40792: The result of :c:func:`PyNumber_Index` now always has exact
12232 - bpo-39573: Convert :c:func:`Py_REFCNT` and :c:func:`Py_SIZE` macros to
12233   static inline functions. They cannot be used as l-value anymore: use
12235   reference count and size. This change is backward incompatible on purpose,
12238 - bpo-40703: The PyType_FromSpec*() functions no longer overwrite the type's
12239   "__module__" attribute if it is set via "Py_tp_members" or "Py_tp_getset".
12241 - bpo-39583: Remove superfluous "extern C" declarations from
12248 *Release date: 2020-05-19*
12251 --------
12253 - bpo-40501: :mod:`uuid` no longer uses :mod:`ctypes` to load
12257 -----------------
12259 - bpo-40663: Correctly generate annotations where parentheses are omitted
12262 - bpo-40596: Fixed :meth:`str.isidentifier` for non-canonicalized strings
12263   containing non-BMP characters on Windows.
12265 - bpo-40593: Improved syntax errors for invalid characters in source code.
12267 - bpo-40585: Fixed a bug when using :func:`codeop.compile_command` that was
12271 - bpo-40566: Apply :pep:`573` to :mod:`abc`.
12273 - bpo-40502: Initialize ``n->n_col_offset``. (Patch by Joannah Nanjekye)
12275 - bpo-40527: Fix command line argument parsing: no longer write errors
12278 - bpo-1635741: Port :mod:`errno` to multiphase initialization (:pep:`489`).
12280 - bpo-40523: Add pass-throughs for :func:`hash` and :func:`reversed` to
12283 - bpo-1635741: Port :mod:`syslog` to multiphase initialization (:pep:`489`).
12285 - bpo-40246: Reporting a specialised error message for invalid string
12286   prefixes, which was introduced in :issue:`40246`, is being reverted due to
12289   `bg="#d00" if clear else"#fca"` were failing to parse, which is not an
12292 - bpo-40417: Fix imp module deprecation warning when PyImport_ReloadModule
12293   is called. Patch by Robert Rouhani.
12295 - bpo-40408: Fixed support of nested type variables in GenericAlias (e.g.
12298 - bpo-1635741: Port _stat module to multiphase initialization (:pep:`489`).
12300 - bpo-29587: Enable implicit exception chaining when calling
12303 - bpo-40328: Add tools for generating mappings headers for CJKCodecs.
12305 - bpo-40228: Setting frame.f_lineno is now robust w.r.t. changes in the
12306   source-to-bytecode compiler
12308 - bpo-38880: Added the ability to list interpreters associated with channel
12311 - bpo-37986: Improve performance of :c:func:`PyLong_FromDouble` for values
12315 -------
12317 - bpo-40662: Fixed :func:`ast.get_source_segment` for ast nodes that have
12320 - bpo-40665: Convert :mod:`bisect` to use Argument Clinic.
12322 - bpo-40536: Added the :func:`~zoneinfo.available_timezones` function to the
12325 - bpo-40645: The :class:`hmac.HMAC` exposes internal implementation details.
12329 - bpo-40645: The internal module ``_hashlib`` wraps and exposes OpenSSL's
12334 - bpo-40637: Builtin hash modules can now be disabled or selectively enabled
12335   with ``configure --with-builtin-hashlib-hashes=sha3,blake1`` or
12336   ``--without-builtin-hashlib-hashes``.
12338 - bpo-37630: The :mod:`hashlib` module can now use SHA3 hashes and SHAKE XOF
12341 - bpo-40479: The :mod:`hashlib` now compiles with OpenSSL 3.0.0-alpha2.
12343 - bpo-40257: Revert changes to :func:`inspect.getdoc`.
12345 - bpo-40607: When cancelling a task due to timeout, :meth:`asyncio.wait_for`
12349 - bpo-40612: Fix edge cases in SyntaxError formatting. If the offset is <=
12350   0, no caret is printed. If the offset is > line length, the caret is
12353 - bpo-40597: If text content lines are longer than policy.max_line_length,
12354   always use a content-encoding to make sure they are wrapped.
12356 - bpo-40571: Added functools.cache() as a simpler, more discoverable way to
12359 - bpo-40503: :pep:`615`, the :mod:`zoneinfo` module. Adds support for the
12362 - bpo-40397: Removed attributes ``__args__`` and ``__parameters__`` from
12365 - bpo-40549: Convert posixmodule.c ("posix" or "nt" module) to the
12368 - bpo-31033: Add a ``msg`` argument to :meth:`Future.cancel` and
12371 - bpo-40541: Added an optional *counts* parameter to random.sample().
12373 - bpo-40515: The :mod:`ssl` and :mod:`hashlib` modules now actively check
12374   that OpenSSL is build with thread support. Python 3.7.0 made thread
12375   support mandatory and no longer works safely with a no-thread builds.
12377 - bpo-31033: When a :class:`asyncio.Task` is cancelled, the exception
12381 - bpo-40504: :func:`functools.lru_cache` objects can now be the targets of
12384 - bpo-40559: Fix possible memory leak in the C implementation of
12387 - bpo-40480: ``fnmatch.fnmatch()`` could take exponential time in the
12392 - bpo-40495: :mod:`compileall` is now able to use hardlinks to prevent
12396 - bpo-40457: The ssl module now support OpenSSL builds without TLS 1.0 and
12399 - bpo-40355: Improve error reporting in :func:`ast.literal_eval` in the
12401   any non-conforming elements. Patch by Curtis Bucher.
12403 - bpo-40465: Deprecated the optional *random* argument to
12406 - bpo-40459: :func:`platform.win32_ver` now produces correct *ptype* strings
12409 - bpo-39435: The first argument of :func:`pickle.loads` is now
12410   positional-only.
12412 - bpo-39305: Update :mod:`nntplib` to merge :class:`nntplib.NNTP` and
12413   :class:`nntplib._NNTPBase`. Patch by Dong-hee Na.
12415 - bpo-32494: Update :mod:`dbm.gnu` to use gdbm_count if possible when
12416   calling :func:`len`. Patch by Dong-hee Na.
12418 - bpo-40453: Add ``isolated=True`` keyword-only parameter to
12422 - bpo-40286: Remove ``_random.Random.randbytes()``: the C implementation of
12426 - bpo-40394: Added default arguments to
12429 - bpo-39995: Fix a race condition in concurrent.futures._ThreadWakeup:
12430   access to _ThreadWakeup is now protected with the shutdown lock.
12432 - bpo-30966: ``Process.shutdown(wait=True)`` of :mod:`concurrent.futures`
12435 - bpo-30966: Add a new :meth:`~multiprocessing.SimpleQueue.close` method to
12439 - bpo-39966: Revert bpo-25597. :class:`unittest.mock.MagicMock` with wraps'
12442 - bpo-39791: Added ``files()`` function to importlib.resources with support
12446 - bpo-40375: :meth:`imaplib.IMAP4.unselect` is added. Patch by Dong-hee Na.
12448 - bpo-40389: ``repr()`` now returns ``typing.Optional[T]`` when called for
12449   ``typing.Union`` of two types, one of which is ``NoneType``.
12451 - bpo-40291: Add support for CAN_J1939 sockets (available on Linux 5.4+)
12453 - bpo-40273: :class:`types.MappingProxyType` is now reversible.
12455 - bpo-39075: The repr for :class:`types.SimpleNamespace` is now insertion
12458 - bpo-40192: On AIX, :func:`~time.thread_time` is now implemented with
12463 - bpo-40025: Raise TypeError when _generate_next_value_ is defined after
12466 - bpo-39058: In the argparse module, the repr for Namespace() and other
12468   Formerly, it displayed in alphabetical order even though argument order is
12471 - bpo-24416: The ``isocalendar()`` methods of :class:`datetime.date` and
12476 -------------
12478 - bpo-34790: Add version of removal for explicit passing of coros to
12481 - bpo-40561: Provide docstrings for webbrowser open functions.
12483 - bpo-40499: Mention that :func:`asyncio.wait` requires a non-empty set of
12486 - bpo-39705: Tutorial example for sorted() in the Loop Techniques section is
12487   given a better explanation. Also a new example is included to explain
12490 - bpo-39435: Fix an incorrect signature for :func:`pickle.loads` in the docs
12493 -----
12495 - bpo-40055: distutils.tests now saves/restores warnings filters to leave
12499 - bpo-40436: test_gdb and test.pythoninfo now check gdb command exit code.
12502 -----
12504 - bpo-40653: Move _dirnameW out of HAVE_SYMLINK to fix a potential compiling
12507 - bpo-40514: Add ``--with-experimental-isolated-subinterpreters`` build
12512 -------
12514 - bpo-40650: Include winsock2.h in pytime.c for timeval.
12516 - bpo-40458: Increase reserved stack space to prevent overflow crash on
12519 - bpo-39148: Add IPv6 support to :mod:`asyncio` datagram endpoints in
12524 -----
12526 - bpo-34956: When building Python on macOS from source, ``_tkinter`` now
12527   links with non-system Tcl and Tk frameworks if they are installed in
12529   If a macOS SDK is explicitly configured, by using
12530   ``--enable-universalsdk=`` or ``-isysroot``, only the SDK itself is
12532   ``--with-tcltk-includes`` and ``--with-tcltk-libs``.
12534 - bpo-35569: Expose RFC 3542 IPv6 socket options.
12537 -----------
12539 - bpo-40479: Update multissltest helper to test with latest OpenSSL 1.0.2,
12540   1.1.0, 1.1.1, and 3.0.0-alpha.
12542 - bpo-40431: Fix a syntax typo in ``turtledemo`` that now raises a
12545 - bpo-40163: Fix multissltest tool. OpenSSL has changed download URL for old
12550 -----
12552 - bpo-39465: Remove the ``_PyUnicode_ClearStaticStrings()`` function from
12555 - bpo-38787: Add PyCFunction_CheckExact() macro for exact type checks now
12559 - bpo-40545: Declare ``_PyErr_GetTopmostException()`` with ``PyAPI_FUNC()``
12563 - bpo-40412: Nullify inittab_copy during finalization, preventing future
12567 - bpo-40429: The :c:func:`PyThreadState_GetFrame` function now returns a
12570 - bpo-40428: Remove the following functions from the C API. Call
12582 - bpo-40421: New :c:func:`PyFrame_GetBack` function: get the frame next
12585 - bpo-40421: New :c:func:`PyFrame_GetCode` function: return a borrowed
12588 - bpo-40217: Ensure that instances of types created with
12594 - bpo-38787: Module C state is now accessible from C-defined heap type
12601 *Release date: 2020-04-27*
12604 --------
12606 - bpo-40121: Fixes audit events raised on creating a new socket.
12608 - bpo-39073: Disallow CR or LF in email.headerregistry.Address arguments to
12611 - bpo-39503: CVE-2020-8492: The
12619 -----------------
12621 - bpo-40313: Improve the performance of bytes.hex().
12623 - bpo-40334: Switch to a new parser, based on PEG.  For more details see PEP
12624   617. To temporarily switch back to the old parser, use ``-X oldparser`` or
12629 - bpo-40267: Fix the tokenizer to display the correct error message, when
12630   there is a SyntaxError on the last input character and no newline follows.
12634 - bpo-39522: Correctly unparse explicit ``u`` prefix for strings when
12637 - bpo-40246: Report a specialized error message, `invalid string prefix`,
12640 - bpo-40082: Fix the signal handler: it now always uses the main
12643 - bpo-37388: str.encode() and str.decode() no longer check the encoding and
12648 - bpo-40077: Fix possible refleaks in :mod:`_json`, memo of PyScannerObject
12651 - bpo-37207: Speed up calls to ``dict()`` by using the :pep:`590`
12654 - bpo-40141: Add column and line information to ``ast.keyword`` nodes. Patch
12657 - bpo-1635741: Port :mod:`resource` to multiphase initialization
12660 - bpo-1635741: Port :mod:`math` to multiphase initialization (:pep:`489`).
12662 - bpo-1635741: Port _uuid module to multiphase initialization (:pep:`489`).
12664 - bpo-40077: Convert json module to use :c:func:`PyType_FromSpec`.
12666 - bpo-40067: Improve the error message for multiple star expressions in an
12669 - bpo-1635741: Port _functools module to multiphase initialization (PEP
12672 - bpo-1635741: Port operator module to multiphase initialization (PEP 489).
12675 - bpo-20526: Fix :c:func:`PyThreadState_Clear()`. ``PyThreadState.frame`` is
12677   must not call ``Py_CLEAR(tstate->frame)``.
12679 - bpo-1635741: Port time module to multiphase initialization (:pep:`489`).
12682 - bpo-1635741: Port _weakref extension module to multiphase initialization
12685 - bpo-40020: Fix a leak and subsequent crash in parsetok.c caused by realloc
12688 - bpo-39939: Added str.removeprefix and str.removesuffix methods and
12693 - bpo-39481: Implement PEP 585. This supports list[int], tuple[str, ...]
12696 - bpo-32894: Support unparsing of infinity numbers in postponed annotations.
12699 - bpo-37207: Speed up calls to ``list()`` by using the :pep:`590`
12703 -------
12705 - bpo-40398: :func:`typing.get_args` now always returns an empty tuple for
12708 - bpo-40396: Functions :func:`typing.get_origin`, :func:`typing.get_args`
12712 - bpo-38061: Optimize the :mod:`subprocess` module on FreeBSD using
12713   ``closefrom()``. A single ``close(fd)`` syscall is cheap, but when
12714   ``sysconf(_SC_OPEN_MAX)`` is high, the loop calling ``close(fd)`` on each
12718   fdescfs kernel module, but this is not enabled by default.
12724 - bpo-38061: On FreeBSD, ``os.closerange(fd_low, fd_high)`` now calls
12725   ``closefrom(fd_low)`` if *fd_high* is greater than or equal to
12732 - bpo-40360: The :mod:`lib2to3` module is pending deprecation due to
12735 - bpo-40138: Fix the Windows implementation of :func:`os.waitpid` for exit
12736   code larger than ``INT_MAX >> 8``. The exit status is now interpreted as
12739 - bpo-39942: Set "__main__" as the default module name when "__name__" is
12742 - bpo-40275: The :mod:`logging` package is now imported lazily in
12744   assertion is used.
12746 - bpo-40275: The :mod:`asyncio` package is now imported lazily in
12748   class is used.
12750 - bpo-40330: In :meth:`ShareableList.__setitem__`, check the size of a new
12751   string item after encoding it to utf-8, not before.
12753 - bpo-40148: Added :meth:`pathlib.Path.with_stem()` to create a new Path
12756 - bpo-40325: Deprecated support for set objects in random.sample().
12758 - bpo-40257: Improved help for the :mod:`typing` module. Docstrings are now
12763 - bpo-40257: func:`inspect.getdoc` no longer returns docstring inherited
12764   from the type of the object or from parent class if it is a class if it is
12766   is now shown not only for class, function, method etc, but for any object
12769 - bpo-40287: Fixed ``SpooledTemporaryFile.seek()`` to return the position.
12771 - bpo-40290: Added zscore() to statistics.NormalDist().
12773 - bpo-40282: Allow ``random.getrandbits(0)`` to succeed and to return 0.
12775 - bpo-40286: Add :func:`random.randbytes` function and
12778 - bpo-40277: :func:`collections.namedtuple` now provides a human-readable
12781 - bpo-40270: The included copy of sqlite3 on Windows is now compiled with
12785 - bpo-29255: Wait in `KqueueSelector.select` when no fds are registered
12787 - bpo-40260: Ensure :mod:`modulefinder` uses :func:`io.open_code` and
12790 - bpo-40234: Allow again to spawn daemon threads in subinterpreters (revert
12793 - bpo-39207: Workers in :class:`~concurrent.futures.ProcessPoolExecutor` are
12798 - bpo-40091: Fix a hang at fork in the logging module: the new private
12799   _at_fork_reinit() method is now used to reinitialize locks at fork in the
12802 - bpo-40149: Implement traverse and clear slots in _abc._abc_data type.
12804 - bpo-40208: Remove deprecated :meth:`symtable.SymbolTable.has_exec`.
12806 - bpo-40196: Fix a bug in the :mod:`symtable` module that was causing
12809 - bpo-40190: Add support for ``_SC_AIX_REALMEM`` to :func:`posix.sysconf`.
12811 - bpo-40182: Removed the ``_field_types`` attribute of the
12814 - bpo-36517: Multiple inheritance with :class:`typing.NamedTuple` now raises
12817 - bpo-40126: Fixed reverting multiple patches in unittest.mock. Patcher's
12818   ``__exit__()`` is now never called if its ``__enter__()`` is failed.
12821 - bpo-40094: CGIHTTPRequestHandler of http.server now logs the CGI script
12823   example, if the script is killed by signal 11, it now logs: "CGI script
12824   exit code -11."
12826 - bpo-40108: Improve the error message when triying to import a module using
12830 - bpo-40094: Add :func:`os.waitstatus_to_exitcode` function: convert a wait
12833 - bpo-40089: Fix threading._after_fork(): if fork was not called by a thread
12837 - bpo-40089: Add a private ``_at_fork_reinit()`` method to
12844 - bpo-25780: Expose :data:`~socket.CAN_RAW_JOIN_FILTERS` in the
12847 - bpo-39503: :class:`~urllib.request.AbstractBasicAuthHandler` of
12848   :mod:`urllib.request` now parses all WWW-Authenticate HTTP headers and
12852 - bpo-39812: Removed daemon threads from :mod:`concurrent.futures` by adding
12854   functions prior to joining all non-daemon threads. This allows for
12857 - bpo-40050: Fix ``importlib._bootstrap_external``: avoid creating a new
12861 - bpo-40014: Fix ``os.getgrouplist()``: if ``getgrouplist()`` function fails
12862   because the group list is too small, retry with a larger group list. On
12867 - bpo-40017: Add :data:`time.CLOCK_TAI` constant if the operating system
12870 - bpo-40016: In re docstring, clarify the relationship between inline and
12873 - bpo-39953: Update internal table of OpenSSL error codes in the ``ssl``
12876 - bpo-36144: Added :pep:`584` operators to
12879 - bpo-36144: Added :pep:`584` operators to
12882 - bpo-38891: Fix linear runtime behaviour of the `__getitem__` and
12888 - bpo-39682: Remove undocumented support for *closing* a `pathlib.Path`
12890   but they are now a no-op, making `Path` objects immutable.
12892 - bpo-36144: Added :pep:`584` operators (``|`` and ``|=``) to
12895 - bpo-39011: Normalization of line endings in ElementTree attributes was
12899 - bpo-38410: Properly handle :func:`sys.audit` failures in
12902 - bpo-36541: lib2to3 now recognizes named assignment expressions (the walrus
12905 - bpo-35967: In platform, delay the invocation of 'uname -p' until the
12906   processor attribute is requested.
12908 - bpo-35113: :meth:`inspect.getsource` now returns correct source code for
12913 - bpo-33262: Deprecate passing None as an argument for
12916 - bpo-31758: Prevent crashes when using an uninitialized
12920 -------------
12922 - bpo-27635: The pickle documentation incorrectly claimed that ``__new__``
12925 - bpo-39879: Updated :ref:`datamodel` docs to include :func:`dict` insertion
12928 - bpo-38387: Document :c:macro:`PyDoc_STRVAR` macro in the C-API reference.
12930 - bpo-13743: Some methods within xml.dom.minidom.Element class are now
12934 -----
12936 - bpo-31904: Set expected default encoding in test_c_locale_coercion.py for
12939 - bpo-40162: Update Travis CI configuration to OpenSSL 1.1.1f.
12941 - bpo-40146: Update OpenSSL to 1.1.1f in Azure Pipelines.
12943 - bpo-40094: Add :func:`test.support.wait_process` function.
12945 - bpo-40003: ``test.bisect_cmd`` now copies Python command line options like
12946   ``-O`` or ``-W``. Moreover, emit a warning if ``test.bisect_cmd`` is used
12947   with ``-w``/``--verbose2`` option.
12949 - bpo-39380: Add the encoding in :class:`ftplib.FTP` and
12950   :class:`ftplib.FTP_TLS` to the constructor as keyword-only and change the
12951   default from ``latin-1`` to ``utf-8`` to follow :rfc:`2640`.
12953 - bpo-39793: Use the same domain when testing ``make_msgid``. Patch by
12956 - bpo-1812: Fix newline handling in doctest.testfile when loading from a
12960 -----
12962 - bpo-38360: Support single-argument form of macOS -isysroot flag.
12964 - bpo-40158: Fix CPython MSBuild Properties in NuGet Package
12967 - bpo-38527: Fix configure check on Solaris for "float word ordering":
12972 -------
12974 - bpo-40164: Updates Windows to OpenSSL 1.1.1f
12976 - bpo-8901: Ignore the Windows registry when the ``-E`` option is used.
12979 -----
12981 - bpo-38329: python.org macOS installers now update the Current version
12986 - bpo-40164: Update macOS installer builds to use OpenSSL 1.1.1g.
12989 ----
12991 - bpo-38439: Add a 256×256 pixel IDLE icon to support more modern
12995 - bpo-38689: IDLE will no longer freeze when inspect.signature fails when
12999 -----------
13001 - bpo-40385: Removed the checkpyc.py tool. Please see compileall without
13004 - bpo-40179: Fixed translation of ``#elif`` in Argument Clinic.
13006 - bpo-40094: Fix ``which.py`` script exit code: it now uses
13011 -----
13013 - bpo-40241: Move the :c:type:`PyGC_Head` structure to the internal C API.
13015 - bpo-40170: Convert :c:func:`PyObject_IS_GC` macro to a function to hide
13018 - bpo-40241: Add the functions :c:func:`PyObject_GC_IsTracked` and
13023 - bpo-40170: The :c:func:`PyObject_NEW` macro becomes an alias to the
13029 - bpo-40170: :c:func:`PyType_HasFeature` now always calls
13034 - bpo-40170: Convert the :c:func:`PyObject_GET_WEAKREFS_LISTPTR` macro to a
13038 - bpo-40170: Convert :c:func:`PyObject_CheckBuffer` macro to a function to
13042 - bpo-40170: Always declare :c:func:`PyIndex_Check` as an opaque function to
13046 - bpo-39947: Add :c:func:`PyThreadState_GetID` function: get the unique
13053 *Release date: 2020-03-23*
13056 --------
13058 - bpo-38576: Disallow control characters in hostnames in http.client,
13059   addressing CVE-2019-18348. Such potentially malicious header injection
13063 -----------------
13065 - bpo-40010: Optimize pending calls in multithreaded applications. If a
13067   (:c:func:`Py_AddPendingCall`), the bytecode evaluation loop is no longer
13074 - bpo-1635741: Port _weakref extension module to multiphase initialization
13077 - bpo-1635741: Port _collections module to multiphase initialization
13080 - bpo-40010: Optimize signal handling in multithreaded applications. If a
13082   evaluation loop is no longer interrupted at each bytecode instruction to
13089 - bpo-39984: If :c:func:`Py_AddPendingCall` is called in a subinterpreter,
13090   the function is now scheduled to be called from the subinterpreter, rather
13094 - bpo-1635741: Port _heapq module to multiphase initialization.
13096 - bpo-1635741: Port itertools module to multiphase initialization
13099 - bpo-37207: Speed up calls to ``frozenset()`` by using the :pep:`590`
13100   ``vectorcall`` calling convention. Patch by Dong-hee Na.
13102 - bpo-39984: subinterpreters: Move
13107 - bpo-37207: Speed up calls to ``set()`` by using the :pep:`590`
13108   ``vectorcall`` calling convention. Patch by Dong-hee Na.
13110 - bpo-1635741: Port _statistics module to multiphase initialization
13113 - bpo-39968: Use inline function to replace extension modules'
13116 - bpo-39965: Correctly raise ``SyntaxError`` if *await* is used inside
13117   non-async functions and ``PyCF_ALLOW_TOP_LEVEL_AWAIT`` is set (like in the
13120 - bpo-39562: Allow executing asynchronous comprehensions on the top level
13121   when the ``PyCF_ALLOW_TOP_LEVEL_AWAIT`` flag is given. Patch by Batuhan
13124 - bpo-37207: Speed up calls to ``tuple()`` by using the :pep:`590`
13125   ``vectorcall`` calling convention. Patch by Dong-hee Na.
13127 - bpo-38373: Changed list overallocation strategy. It no longer
13128   overallocates if the new size is closer to overallocated size than to the
13131 - bpo-39926: Update Unicode database to Unicode version 13.0.0.
13133 - bpo-19466: Clear the frames of daemon threads earlier during the Python
13137 - bpo-38894: Fix a bug that was causing incomplete results when calling
13142 - bpo-39877: Fix :c:func:`PyEval_RestoreThread` random crash at exit with
13144   instead of using ``tstate->interp->runtime``, since ``tstate`` can be a
13148 - bpo-39871: Fix a possible :exc:`SystemError` in
13152 - bpo-39776: Fix race condition where threads created by PyGILState_Ensure()
13155   This affects consumers of tstate->id like the contextvar caching
13159 - bpo-39778: Fixed a crash due to incorrect handling of weak references in
13162 - bpo-1635741: Port audioop extension module to multiphase initialization
13165 - bpo-39702: Relax :term:`decorator` grammar restrictions to allow any valid
13168 - bpo-38091: Tweak import deadlock detection code to not deadlock itself.
13170 - bpo-1635741: Port _locale extension module to multiphase initialization
13173 - bpo-39087: Optimize :c:func:`PyUnicode_AsUTF8` and
13175   internal UTF-8 cache.
13177 - bpo-39520: Fix unparsing of ext slices with no items (``foo[:,]``). Patch
13180 - bpo-39220: Do not optimize annotations if 'from __future__ import
13181   annotations' is used. Patch by Pablo Galindo.
13183 - bpo-35712: Using :data:`NotImplemented` in a boolean context has been
13186 - bpo-22490: Don't leak environment variable ``__PYVENV_LAUNCHER__`` into
13190 -------
13192 - bpo-39830: Add :class:`zipfile.Path` to ``__all__`` in the :mod:`zipfile`
13195 - bpo-40000: Improved error messages for validation of ``ast.Constant``
13198 - bpo-39999: ``__module__`` of the AST node classes is now set to "ast"
13202 - bpo-39991: :func:`uuid.getnode` now skips IPv6 addresses with the same
13205 - bpo-39988: Deprecated ``ast.AugLoad`` and ``ast.AugStore`` node classes
13208 - bpo-39656: Ensure ``bin/python3.#`` is always present in virtual
13209   environments on POSIX platforms - by Anthony Sottile.
13211 - bpo-39969: Deprecated ``ast.Param`` node class because it's no longer
13214 - bpo-39360: Ensure all workers exit when finalizing a
13217   experienced when the Pool is not properly finalized via the context
13221 - bpo-35370: sys.settrace(), sys.setprofile() and _lsprof.Profiler.enable()
13223   "sys.settrace" audit event is denied.
13225 - bpo-39936: AIX: Fix _aix_support module when the subprocess is not
13228   if subprocess is available or not. So _aix_support.aix_platform() result
13229   is now the same if subprocess is available or not.
13231 - bpo-36144: :class:`collections.OrderedDict` now implements ``|`` and
13234 - bpo-39652: The column name found in ``sqlite3.Cursor.description`` is now
13235   truncated on the first '[' only if the PARSE_COLNAMES option is set.
13237 - bpo-39915: Ensure :attr:`unittest.mock.AsyncMock.await_args_list` has call
13242 - bpo-36144: Updated :data:`os.environ` and :data:`os.environb` to support
13245 - bpo-38662: The ``ensurepip`` module now invokes ``pip`` via the ``runpy``
13246   module. Hence it is no longer tightly coupled with the internal API of the
13250 - bpo-38075: Fix the :meth:`random.Random.seed` method when a :class:`bool`
13251   is passed as the seed.
13253 - bpo-39916: More reliable use of ``os.scandir()`` in ``Path.glob()``. It no
13256 - bpo-39850: :mod:`multiprocessing` now supports abstract socket addresses
13258   arbitrary addresses (like when default-constructing
13260   preferred to avoid the case when the temporary-file-generated address is
13263 - bpo-36287: :func:`ast.dump()` no longer outputs optional fields and
13266   ``Constant.kind`` is set to ``None``).
13268 - bpo-39889: Fixed :func:`ast.unparse` for extended slices containing a
13272 - bpo-39828: Fix :mod:`json.tool` to catch :exc:`BrokenPipeError`. Patch by
13273   Dong-hee Na.
13275 - bpo-13487: Avoid a possible *"RuntimeError: dictionary changed size during
13279 - bpo-39674: Revert "bpo-37330: open() no longer accept 'U' in file mode".
13280   The "U" mode of open() is kept in Python 3.9 to ease transition from
13283 - bpo-28577: The hosts method on 32-bit prefix length IPv4Networks and
13284   128-bit prefix IPv6Networks now returns a list containing the single
13287 - bpo-39826: Add getConnection method to logging HTTPHandler to enable
13290 - bpo-39763: Reimplement :func:`distutils.spawn.spawn` function with the
13293 - bpo-39794: Add --without-decimal-contextvar build option.  This enables a
13294   thread-local rather than a coroutine local context.
13296 - bpo-36144: :class:`collections.defaultdict` now implements ``|``
13299 - bpo-39517: Fix runpy.run_path() when using pathlike objects
13301 - bpo-39775: Change ``inspect.Signature.parameters`` back to
13305 - bpo-39678: Refactor queue_manager in
13309 - bpo-39764: Fix AttributeError when calling get_stack on a PyAsyncGenObject
13312 - bpo-39769: The :func:`compileall.compile_dir` function's *ddir* parameter
13313   and the compileall command line flag `-d` no longer write the wrong
13318 - bpo-36144: :class:`types.MappingProxyType` objects now support the merge
13321 - bpo-38691: The :mod:`importlib` module now ignores the
13322   :envvar:`PYTHONCASEOK` environment variable when the :option:`-E` or
13323   :option:`-I` command line options are being used.
13325 - bpo-39719: Remove :meth:`tempfile.SpooledTemporaryFile.softspace` as files
13328 - bpo-39667: Improve pathlib.Path compatibility on zipfile.Path and correct
13331 - bpo-39638: Keep ASDL signatures in the docstrings for ``AST`` nodes. Patch
13334 - bpo-39639: Deprecated ``ast.Suite`` node class because it's no longer
13337 - bpo-39609: Add thread_name_prefix to default asyncio executor
13339 - bpo-39548: Fix handling of header in
13341   ``qop`` parameter is not present.
13343 - bpo-39509: HTTP status codes ``103 EARLY_HINTS`` and ``425 TOO_EARLY`` are
13344   added to :class:`http.HTTPStatus`. Patch by Dong-hee Na.
13346 - bpo-39507: Adding HTTP status 418 "I'm a Teapot" to HTTPStatus in http
13349 - bpo-39495: Remove default value from *attrs* parameter of
13353 - bpo-38971: Open issue in the BPO indicated a desire to make the
13355   a try/except to assure file stream gets closed before an exception is
13358 - bpo-38641: Added starred expressions support to ``return`` and ``yield``
13361 - bpo-37534: When using minidom module to generate XML documents the ability
13362   to add Standalone Document Declaration is added. All the changes are made
13363   to generate a document in compliance with Extensible Markup Language (XML)
13365   https://www.w3.org/TR/xml/#sec-prolog-dtd).
13367 - bpo-34788: Add support for scoped IPv6 addresses to :mod:`ipaddress`.
13370 - bpo-34822: Simplified AST for subscription. Simple indices are now
13378 -------------
13380 - bpo-39868: Updated the Language Reference for :pep:`572`.
13382 - bpo-13790: Change 'string' to 'specification' in format doc.
13384 - bpo-17422: The language reference no longer restricts default class
13387 - bpo-39530: Fix misleading documentation about mixed-type numeric
13390 - bpo-39718: Update :mod:`token` documentation to reflect additions in
13393 - bpo-39677: Changed operand name of **MAKE_FUNCTION** from *argc* to
13397 -----
13399 - bpo-40019: test_gdb now skips tests if it detects that gdb failed to read
13400   debug information because the Python binary is optimized.
13402 - bpo-27807: ``test_site.test_startup_imports()`` is now skipped if a path
13405 - bpo-26067: Do not fail test_shutil test_chown test when uid or gid of user
13408 - bpo-39855: test_subprocess.test_user() now skips the test on an user name
13413 -----
13415 - bpo-39761: Fix build with DTrace but without additional DFLAGS.
13417 - bpo-39763: setup.py now uses a basic implementation of the
13418   :mod:`subprocess` module if the :mod:`subprocess` module is not available:
13421 - bpo-1294959: Add ``--with-platlibdir`` option to the configure script:
13422   name of the platform-specific library directory, stored in the new
13423   :attr:`sys.platlibdir` attribute. It is used to build the path of
13424   platform-specific extension modules and the path of the standard library.
13425   It is equal to ``"lib"`` on most platforms. On Fedora and SuSE, it is
13426   equal to ``"lib64"`` on 64-bit platforms. Patch by Jan Matějek, Matěj
13430 -------
13432 - bpo-39930: Ensures the required :file:`vcruntime140.dll` is included in
13435 - bpo-39847: Avoid hang when computer is hibernated whilst waiting for a
13436   mutex (for lock-related objects from :mod:`threading`) around 49-day
13439 - bpo-38597: :mod:`distutils` will no longer statically link
13440   :file:`vcruntime140.dll` when a redistributable version is unavailable.
13444 - bpo-38380: Update Windows builds to use SQLite 3.31.1
13446 - bpo-39789: Update Windows release build machines to Visual Studio 2019
13449 - bpo-34803: Package for nuget.org now includes repository reference and
13453 -----
13455 - bpo-38380: Update macOS builds to use SQLite 3.31.1
13458 ----
13460 - bpo-27115: For 'Go to Line', use a Query box subclass with IDLE standard
13463 - bpo-39885: Since clicking to get an IDLE context menu moves the cursor,
13464   any text selection should be and now is cleared.
13466 - bpo-39852: Edit "Go to line" now clears any selection, preventing
13469 - bpo-39781: Selecting code context lines no longer causes a jump.
13472 -----------
13474 - bpo-36184: Port python-gdb.py to FreeBSD. python-gdb.py now checks for
13476   instead of checking for "pthread_cond_timedwait" which is specific to
13479 - bpo-38080: Added support to fix ``getproxies`` in the
13484 -----
13486 - bpo-40024: Add :c:func:`PyModule_AddType` helper function: add a type to a
13487   module. Patch by Dong-hee Na.
13489 - bpo-39946: Remove ``_PyRuntime.getframe`` hook and remove
13494 - bpo-39947: Add :c:func:`PyThreadState_GetFrame` function: get the current
13497 - bpo-37207: Add _PyArg_NoKwnames helper function. Patch by Dong-hee Na.
13499 - bpo-39947: Add :c:func:`PyThreadState_GetInterpreter`: get the interpreter
13502 - bpo-39947: Add :c:func:`PyInterpreterState_Get` function to the limited C
13505 - bpo-35370: If :c:func:`PySys_Audit` fails in :c:func:`PyEval_SetProfile`
13508 - bpo-39947: Move the static inline function flavor of
13513 - bpo-39947: Py_TRASHCAN_BEGIN_CONDITION and Py_TRASHCAN_END macro no longer
13517 - bpo-39884: :c:func:`PyDescr_NewMethod` and :c:func:`PyCFunction_NewEx` now
13521 - bpo-39877: Deprecated :c:func:`PyEval_InitThreads` and
13525 - bpo-38249: :c:macro:`Py_UNREACHABLE` is now implemented with
13528 - bpo-38643: :c:func:`PyNumber_ToBase` now raises a :exc:`SystemError`
13531 - bpo-39882: The :c:func:`Py_FatalError` function is replaced with a macro
13533   ``Py_LIMITED_API`` macro is defined.
13535 - bpo-39824: Extension modules: :c:member:`~PyModuleDef.m_traverse`,
13538   state was requested but is not allocated yet. This is the case immediately
13539   after the module is created and before the module is executed
13541   called if :c:member:`~PyModuleDef.m_size` is greater than 0 and the module
13542   state (as returned by :c:func:`PyModule_GetState`) is ``NULL``.
13546 - bpo-38913: Fixed segfault in ``Py_BuildValue()`` called with a format
13547   containing "#" and undefined PY_SSIZE_T_CLEAN whwn an exception is set.
13549 - bpo-38500: Add a private API to get and set the frame evaluation function:
13559 *Release date: 2020-02-25*
13562 --------
13564 - bpo-39184: Add audit events to functions in `fcntl`, `msvcrt`, `os`,
13567 - bpo-39401: Avoid unsafe DLL load at startup on Windows 7 and earlier.
13569 - bpo-39184: Add audit events to command execution functions in os and pty
13573 -----------------
13575 - bpo-39382: Fix a use-after-free in the single inheritance path of
13579 - bpo-39573: Update clinic tool to use :c:func:`Py_IS_TYPE`. Patch by
13580   Dong-hee Na.
13582 - bpo-39619: Enable use of :func:`os.chroot` on HP-UX systems.
13584 - bpo-39573: Add :c:func:`Py_IS_TYPE` static inline function to check
13585   whether the object *o* type is *type*.
13587 - bpo-39606: Fix regression caused by fix for bpo-39386, that prevented
13591 - bpo-39579: Change the ending column offset of `Attribute` nodes
13595 - bpo-1635741: Port _crypt extension module to multiphase initialization
13598 - bpo-1635741: Port _contextvars extension module to multiphase
13601 - bpo-39510: Fix segfault in ``readinto()`` method on closed BufferedReader.
13603 - bpo-39502: Fix :func:`time.localtime` on 64-bit AIX  to support years
13606 - bpo-39492: Fix a reference cycle in the C Pickler that was preventing the
13609 - bpo-39453: Fixed a possible crash in :meth:`list.__contains__` when a list
13610   is changed during comparing items. Patch by Dong-hee Na.
13612 - bpo-39434: :term:`floor division` of float operation now has a better
13614   operation is updated. Patch by Dong-hee Na.
13616 - bpo-1635741: Port _codecs extension module to multiphase initialization
13619 - bpo-1635741: Port _bz2 extension module to multiphase initialization
13622 - bpo-1635741: Port _abc extension module to multiphase initialization
13625 - bpo-39320: Replace two complex bytecodes for building dicts with two
13630 - bpo-39219: Syntax errors raised in the tokenizer now always set correct
13633 - bpo-36051: Drop the GIL during large ``bytes.join`` operations. Patch by
13636 - bpo-38960: Fix DTrace build issues on FreeBSD. Patch by David Carlier.
13638 - bpo-37207: Speed up calls to ``range()`` by about 30%, by using the PEP
13641 - bpo-36144: :class:`dict` (and :class:`collections.UserDict`) objects now
13645 - bpo-32856: Optimized the idiom for assignment a temporary variable in
13646   comprehensions. Now ``for y in [expr]`` in comprehensions is as fast as a
13650 -------
13652 - bpo-30566: Fix :exc:`IndexError` when trying to decode an invalid string
13655 - bpo-39649: Remove obsolete check for `__args__` in
13658 - bpo-39648: Expanded :func:`math.gcd` and :func:`math.lcm` to handle
13661 - bpo-39681: Fix a regression where the C pickle module wouldn't allow
13662   unpickling from a file-like object that doesn't expose a readinto()
13665 - bpo-35950: Raise :exc:`io.UnsupportedOperation` in
13666   :meth:`io.BufferedReader.truncate` when it is called on a read-only
13669 - bpo-39479: Add :func:`math.lcm` function: least common multiple.
13671 - bpo-39674: Revert "Do not expose abstract collection classes in the
13672   collections module" change (bpo-25988). Aliases to ABC like
13676 - bpo-39104: Fix hanging ProcessPoolExcutor on ``shutdown(wait=False)`` when
13679 - bpo-39627: Fixed TypedDict totality check for inherited keys.
13681 - bpo-39474: Fixed starting position of AST for expressions like ``(a)(b)``,
13684 - bpo-21016: The :mod:`pydoc` and :mod:`trace` modules now use the
13689 - bpo-39590: Collections.deque now holds strong references during
13692 - bpo-39586: The distutils ``bdist_msi`` command is deprecated in Python
13695 - bpo-39595: Improved performance of zipfile.Path for files with a large
13698   <https://importlib-metadata.readthedocs.io/en/latest/history.html#v1-5-0>`_.
13700 - bpo-39350: Fix regression in :class:`fractions.Fraction` if the numerator
13701   and/or the denominator is an :class:`int` subclass. The :func:`math.gcd`
13702   function is now used to normalize the *numerator* and *denominator*.
13706 - bpo-39567: Added audit for :func:`os.walk`, :func:`os.fwalk`,
13709 - bpo-39559: Remove unused, undocumented argument ``getters`` from
13712 - bpo-38149: :func:`sys.audit` is now called only once per call of
13715 - bpo-39546: Fix a regression in :class:`~argparse.ArgumentParser` where
13717   character other than "-".
13719 - bpo-39450: Striped whitespace from docstring before returning it from
13722 - bpo-12915: A new function ``resolve_name`` has been added to the
13724   ``'a.b:c.d'`` to an object. In the example, ``a.b`` is a package/module
13725   and ``c.d`` is an object within that package/module reached via recursive
13728 - bpo-39353: The :func:`binascii.crc_hqx` function is no longer deprecated.
13730 - bpo-39493: Mark ``typing.IO.closed`` as a property
13732 - bpo-39491: Add :data:`typing.Annotated` and ``include_extras`` parameter
13736 - bpo-39485: Fix a bug in :func:`unittest.mock.create_autospec` that would
13740 - bpo-38932: Mock fully resets child objects on reset_mock(). Patch by
13743 - bpo-39082: Allow AsyncMock to correctly patch static/class methods
13745 - bpo-39432: Implement PEP-489 algorithm for non-ascii "PyInit\_..." symbol
13749 - bpo-18819: Omit ``devmajor`` and ``devminor`` fields for non-device files
13750   in :mod:`tarfile` archives, enabling bit-for-bit compatibility with GNU
13753 - bpo-39349: Added a new *cancel_futures* parameter to
13758 - bpo-39274: ``bool(fraction.Fraction)`` now returns a boolean even if
13761 - bpo-34793: Remove support for ``with (await asyncio.lock):`` and ``with
13762   (yield from asyncio.lock):``.  The same is correct for
13765 - bpo-25597: Ensure, if ``wraps`` is supplied to
13766   :class:`unittest.mock.MagicMock`, it is used to calculate return values
13770 - bpo-36350: `inspect.Signature.parameters` and
13774 - bpo-35727: Fix sys.exit() and sys.exit(None) exit code propagation when
13777 - bpo-32173: * Add `lazycache` function to `__all__`. * Use `dict.clear` to
13782 -------------
13784 - bpo-17422: The language reference now specifies restrictions on class
13787 - bpo-39572: Updated documentation of ``total`` flag of ``TypedDict``.
13789 - bpo-39654: In pyclbr doc, update 'class' to 'module' where appropriate and
13792 - bpo-39153: Clarify refcounting semantics for the following functions: -
13793   PyObject_SetItem - PyMapping_SetItemString - PyDict_SetItem -
13796 - bpo-39392: Explain that when filling with turtle, overlap regions may be
13799 - bpo-39369: Update mmap readline method description. The fact that the
13804 - bpo-9056: Include subsection in TOC for PDF version of docs.
13807 -----
13809 - bpo-38325: Skip tests on non-BMP characters of test_winconsoleio.
13811 - bpo-39502: Skip test_zipfile.test_add_file_after_2107() if
13812   :func:`time.localtime` fails with :exc:`OverflowError`. It is the case on
13816 -----
13818 - bpo-39489: Remove ``COUNT_ALLOCS`` special build.
13821 -------
13823 - bpo-39553: Delete unused code related to SxS manifests.
13825 - bpo-39439: Honor the Python path when a virtualenv is active on Windows.
13827 - bpo-39393: Improve the error message when attempting to load a DLL with
13830 - bpo-38883: :meth:`~pathlib.Path.home()` and
13832   :envvar:`USERPROFILE` and no longer use :envvar:`HOME`, which is not
13837 - bpo-39185: The build.bat script has additional options for very-quiet
13838   output (-q) and very-verbose output (-vv)
13841 ----
13843 - bpo-39663: Add tests for pyparse find_good_parse_start().
13845 - bpo-39600: In the font configuration window, remove duplicated font names.
13847 - bpo-30780: Add remaining configdialog tests for buttons and highlights and
13850 - bpo-39388: IDLE Settings Cancel button now cancels pending changes
13852 - bpo-38792: Close an IDLE shell calltip if a :exc:`KeyboardInterrupt` or
13856 -----
13858 - bpo-35081: Move the ``bytes_methods.h`` header file to the internal C API
13862 - bpo-35081: Move the ``dtoa.h`` header file to the internal C API as
13867 - bpo-39573: Add :c:func:`Py_SET_SIZE` function to set the size of an
13870 - bpo-39500: :c:func:`PyUnicode_IsIdentifier` does not call
13871   :c:func:`Py_FatalError` anymore if the string is not ready.
13873 - bpo-39573: Add :c:func:`Py_SET_TYPE` function to set the type of an
13876 - bpo-39573: Add a :c:func:`Py_SET_REFCNT` function to set the reference
13879 - bpo-39542: Convert :c:func:`PyType_HasFeature`, :c:func:`PyType_Check` and
13882 - bpo-39542: In the limited C API, ``PyObject_INIT()`` and
13890 - bpo-39542: Exclude trashcan mechanism from the limited C API: it requires
13894 - bpo-39511: The :c:func:`PyThreadState_Clear` function now calls the
13898 - bpo-38076: Fix to clear the interpreter state only after clearing module
13902 - bpo-39245: The Vectorcall API (PEP 590) was made public, adding the
13912 *Release date: 2020-01-24*
13915 -----------------
13917 - bpo-39427: Document all possibilities for the ``-X`` options in the
13920 - bpo-39421: Fix possible crashes when operating with the functions in the
13923 - bpo-39386: Prevent double awaiting of async iterator.
13925 - bpo-17005: Add :class:`functools.TopologicalSorter` to the
13929 - bpo-39320: Replace four complex bytecodes for building sequences with
13945 - bpo-39336: Import loaders which publish immutable module objects can now
13948 - bpo-39322: Added a new function :func:`gc.is_finalized` to check if an
13952 - bpo-39048: Improve the displayed error message when incorrect types are
13957 - bpo-39235: Fix AST end location for lone generator expression in function
13960 - bpo-39209: Correctly handle multi-line tokens in interactive mode. Patch
13963 - bpo-1635741: Port _json extension module to multiphase initialization
13966 - bpo-39216: Fix constant folding optimization for positional only arguments
13967   - by Anthony Sottile.
13969 - bpo-39215: Fix ``SystemError`` when nested function has annotation on
13970   positional-only argument - by Anthony Sottile.
13972 - bpo-39200: Correct the error message when calling the :func:`min` or
13973   :func:`max` with no arguments. Patch by Dong-hee Na.
13975 - bpo-39200: Correct the error message when trying to construct
13978 - bpo-39166: Fix incorrect line execution reporting in trace functions when
13982 - bpo-39114: Fix incorrect line execution reporting in trace functions when
13985 - bpo-39156: Split the COMPARE_OP bytecode instruction into four distinct
13989   *  IS_OP for 'is' and 'is not' tests
13990   *  CONTAINS_OP for 'in' and 'is not' tests
13991   *  JUMP_IF_NOT_EXC_MATCH for checking exceptions in 'try-except' statements.
13996 - bpo-38588: Fix possible crashes in dict and list when calling
13999 - bpo-13601: By default, ``sys.stderr`` is line-buffered now, even if
14000   ``stderr`` is redirected to a file. You can still make ``sys.stderr``
14001   unbuffered by passing the :option:`-u` command-line option or setting the
14004   (Contributed by Jendrik Seipp in bpo-13601.)
14006 - bpo-38610: Fix possible crashes in several list methods by holding strong
14010 - bpo-32021: Include brotli .br encoding in mimetypes encodings_map
14013 -------
14015 - bpo-39430: Fixed race condition in lazy imports in :mod:`tarfile`.
14017 - bpo-39413: The :func:`os.unsetenv` function is now also available on
14020 - bpo-39390: Fixed a regression with the `ignore` callback of
14024 - bpo-39395: The :func:`os.putenv` and :func:`os.unsetenv` functions are now
14027 - bpo-39406: If ``setenv()`` C function is available, :func:`os.putenv` is
14031 - bpo-39396: Fix ``math.nextafter(-0.0, +0.0)`` on AIX 7.1.
14033 - bpo-29435: Allow :func:`tarfile.is_tarfile` to be used with file and
14034   file-like objects, like :func:`zipfile.is_zipfile`. Patch by William
14037 - bpo-39377: Removed ``encoding`` option from :func:`json.loads`.  It has
14040 - bpo-39389: Write accurate compression level metadata in :mod:`gzip`
14043 - bpo-39366: The previously deprecated ``xpath()`` and ``xgtitle()`` methods
14046 - bpo-39357: Remove the *buffering* parameter of :class:`bz2.BZ2File`. Since
14049   file is opened. The *compresslevel* parameter becomes keyword-only.
14051 - bpo-39353: Deprecate binhex4 and hexbin4 standards. Deprecate the
14057 - bpo-39351: Remove ``base64.encodestring()`` and ``base64.decodestring()``,
14061 - bpo-39350: Remove ``fractions.gcd()`` function, deprecated since Python
14064 - bpo-39329: :class:`~smtplib.LMTP` constructor now has an optional
14065   *timeout* parameter. Patch by Dong-hee Na.
14067 - bpo-39313: Add a new ``exec_function`` option (*--exec-function* in the
14071 - bpo-39259: :class:`~ftplib.FTP_TLS` and :class:`~ftplib.FTP_TLS` now raise
14072   a :class:`ValueError` if the given timeout for their constructor is zero
14073   to prevent the creation of a non-blocking socket. Patch by Dong-hee Na.
14075 - bpo-39259: :class:`~smtplib.SMTP` and :class:`~smtplib.SMTP_SSL` now raise
14076   a :class:`ValueError` if the given timeout for their constructor is zero
14077   to prevent the creation of a non-blocking socket. Patch by Dong-hee Na.
14079 - bpo-39310: Add :func:`math.ulp`: return the value of the least significant
14082 - bpo-39297: Improved performance of importlib.metadata distribution
14086 - bpo-39259: :class:`~nntplib.NNTP` and :class:`~nntplib.NNTP_SSL` now raise
14087   a :class:`ValueError` if the given timeout for their constructor is zero
14088   to prevent the creation of a non-blocking socket. Patch by Dong-hee Na.
14090 - bpo-38901: When you specify prompt='.' or equivalently python -m venv
14091   --prompt . ... the basename of the current directory is used to set the
14094 - bpo-39288: Add :func:`math.nextafter`: return the next floating-point
14097 - bpo-39259: :class:`~poplib.POP3` and :class:`~poplib.POP3_SSL` now raise a
14098   :class:`ValueError` if the given timeout for their constructor is zero to
14099   prevent the creation of a non-blocking socket. Patch by Dong-hee Na.
14101 - bpo-39242: Updated the Gmane domain from news.gmane.org to news.gmane.io
14102   which is used for examples of :class:`~nntplib.NNTP` news reader server
14105 - bpo-35292: Proxy the `SimpleHTTPRequestHandler.guess_type` to
14106   `mimetypes.guess_type` so the `mimetypes.init` is called lazily to avoid
14107   unnecessary costs when :mod:`http.server` module is imported.
14109 - bpo-39239: The :meth:`select.epoll.unregister` method no longer ignores
14112 - bpo-38907: In http.server script, restore binding to IPv4 on Windows.
14114 - bpo-39152: Fix ttk.Scale.configure([name]) to return configuration tuple
14117 - bpo-39198: If an exception were to be thrown in `Logger.isEnabledFor`
14120   block of code with `try...finally` to ensure the lock is released.
14122 - bpo-39191: Perform a check for running loop before starting a new task in
14126 - bpo-38871: Correctly parenthesize filter-based statements that contain
14127   lambda expressions in mod:`lib2to3`. Patch by Dong-hee Na.
14129 - bpo-39142: A change was made to logging.config.dictConfig to avoid
14135 - bpo-39158: ast.literal_eval() now supports empty sets.
14137 - bpo-39129: Fix import path for ``asyncio.TimeoutError``
14139 - bpo-39057: :func:`urllib.request.proxy_bypass_environment` now ignores
14142 - bpo-39056: Fixed handling invalid warning category in the -W option.  No
14143   longer import the re module if it is not needed.
14145 - bpo-39055: :func:`base64.b64decode` with ``validate=True`` raises now a
14148 - bpo-21600: Fix :func:`mock.patch.stopall` to stop active patches that were
14151 - bpo-39019: Implement dummy ``__class_getitem__`` for
14154 - bpo-39019: Implement dummy ``__class_getitem__`` for ``subprocess.Popen``,
14157 - bpo-38914: Adjusted the wording of the warning issued by distutils'
14159   supplied but no corresponding e-mail field (``author_email`` or
14160   ``maintainer_email``) is found. The wording now reflects the fact that
14163 - bpo-38878: Fixed __subclasshook__ of :class:`os.PathLike` to return a
14166 - bpo-38615: :class:`~imaplib.IMAP4` and :class:`~imaplib.IMAP4_SSL` now
14171   Dong-hee Na.
14173 - bpo-35182: Fixed :func:`Popen.communicate` subsequent call crash when the
14177 - bpo-38630: On Unix, :meth:`subprocess.Popen.send_signal` now polls the
14180   attribute is still ``None``, and the pid has been reassigned (recycled) to
14183 - bpo-38536: Removes trailing space in formatted currency with
14188 - bpo-38473: Use signature from inner mock for autospecced methods attached
14191 - bpo-38361: Fixed an issue where ``ident`` could include a leading path
14194 - bpo-38293: Add :func:`copy.copy` and :func:`copy.deepcopy` support to
14197 - bpo-37958: Added the pstats.Stats.get_profile_dict() method to return the
14200 - bpo-28367: Termios magic constants for the following baud rates:   -
14201   B500000   - B576000   - B921600   - B1000000   - B1152000   - B1500000   -
14202   B2000000   - B2500000   - B3000000   - B3500000   - B4000000 Patch by
14206 -------------
14208 - bpo-39381: Mention in docs that :func:`asyncio.get_event_loop` implicitly
14211 - bpo-38918: Add an entry for ``__module__`` in the "function" & "method"
14212   sections of the :mod:`inspect` docs' :ref:`inspect-types` table.
14214 - bpo-3530: In the :mod:`ast` module documentation, fix a misleading
14219 -----
14221 - bpo-39395: On non-Windows platforms, the :c:func:`setenv` and
14224 - bpo-39160: Updated the documentation in `./configure --help` to show
14228 - bpo-39144: The ctags and etags build targets both include Modules/_ctypes
14232 ----
14234 - bpo-39050: Make IDLE Settings dialog Help button work again.
14236 - bpo-34118: Tag memoryview, range, and tuple as classes, the same as list,
14237   etcetera, in the library manual built-in functions list.
14239 - bpo-32989: Add tests for editor newline_and_indent_event method. Remove
14243 -----
14245 - bpo-39372: Clean header files of interfaces defined but with no
14254 - bpo-39164: Add a private ``_PyErr_GetExcInfo()`` function to retrieve
14261 *Release date: 2019-12-18*
14264 --------
14266 - bpo-38945: Newline characters have been escaped when performing uu
14271 - bpo-37228: Due to significant security concerns, the *reuse_address*
14272   parameter of :meth:`asyncio.loop.create_datagram_endpoint` is no longer
14273   supported. This is because of the behavior of ``SO_REUSEADDR`` in UDP. For
14278 - bpo-38804: Fixes a ReDoS vulnerability in :mod:`http.cookiejar`. Patch by
14282 -----------------
14284 - bpo-39028: Slightly improve the speed of keyword argument parsing with
14288 - bpo-39080: Fix the value of *end_col_offset* for Starred Expression AST
14292 - bpo-39031: When parsing an "elif" node, lineno and col_offset of the node
14296 - bpo-20443: In Python 3.9.0a1, sys.argv[0] was made an absolute path if a
14300 - bpo-39008: :c:func:`PySys_Audit` now requires ``Py_ssize_t`` to be used
14304 - bpo-38673: In REPL mode, don't switch to PS2 if the line starts with
14307 - bpo-38922: Calling ``replace`` on a code object now raises the
14310 - bpo-38920: Add audit hooks for when :func:`sys.excepthook` and
14313 - bpo-38892: Improve documentation for audit events table and functions.
14315 - bpo-38852: Set the thread stack size to 8 Mb for debug builds on android
14318 - bpo-38858: Each Python subinterpreter now has its own "small integer
14319   singletons": numbers in [-5; 257] range. It is no longer possible to
14324 - bpo-36854: The garbage collector state becomes per interpreter
14328 - bpo-38835: The ``PyFPE_START_PROTECT()`` and ``PyFPE_END_PROTECT()``
14332 - bpo-38328: Sped up the creation time of constant :class:`list` and
14335 - bpo-38707: ``MainThread.native_id`` is now correctly reset in child
14339 - bpo-38629: Added ``__floor__`` and ``__ceil__`` methods to float object.
14342 - bpo-27145: int + int and int - int operators can now return small integer
14345 - bpo-38021: Provide a platform tag for AIX that is sufficient for PEP425
14348 - bpo-35409: Ignore GeneratorExit exceptions when throwing an exception into
14351 - bpo-33387: Removed WITH_CLEANUP_START, WITH_CLEANUP_FINISH, BEGIN_FINALLY,
14354   for exceptional and non-exceptional branches for 'with' and 'try-except'
14355   statements. For 'try-finally' statements the 'finally' block is replicated
14359 -------
14361 - bpo-39033: Fix :exc:`NameError` in :mod:`zipimport`. Patch by Karthikeyan
14364 - bpo-39022: Update importlib.metadata to include improvements from
14368 - bpo-39006: Fix asyncio when the ssl module is missing: only check for
14369   ssl.SSLSocket instance if the ssl module is available.
14371 - bpo-38708: Fix a potential IndexError in email parser when parsing an
14372   empty msg-id.
14374 - bpo-38698: Add a new ``InvalidMessageID`` token to email parser to
14375   represent invalid Message-ID headers.  Also, add defects when there is
14378 - bpo-38994: Implement ``__class_getitem__`` for ``os.PathLike``,
14381 - bpo-38979: Return class from ``ContextVar.__class_getitem__`` to simplify
14384 - bpo-38978: Implement ``__class_getitem__`` on asyncio objects (Future,
14387 - bpo-38916: :class:`array.array`: Remove ``tostring()`` and
14391 - bpo-38986: Make repr of C accelerated TaskWakeupMethWrapper the same as of
14394 - bpo-38982: Fix asyncio ``PidfdChildWatcher``: handle ``waitpid()`` error.
14395   If ``waitpid()`` is called elsewhere, ``waitpid()`` call fails with
14397   warning. It ensures that the pidfd file descriptor is closed if this error
14400 - bpo-38529: Drop too noisy asyncio warning about deletion of a stream
14403 - bpo-27413: Added ability to pass through ``ensure_ascii`` options to
14404   json.dumps in the ``json.tool`` command-line interface.
14406 - bpo-38634: The :mod:`readline` module now detects if Python is linked to
14410 - bpo-33684: Fix ``json.tool`` failed to read a JSON file with non-ASCII
14411   characters when locale encoding is not UTF-8.
14413 - bpo-38698: Prevent UnboundLocalError to pop up in parse_message_id.
14419 - bpo-38927: Use ``python -m pip`` instead of ``pip`` to upgrade
14422 - bpo-26730: Fix ``SpooledTemporaryFile.rollover()`` might corrupt the file
14423   when it is in text mode. Patch by Serhiy Storchaka.
14425 - bpo-38881: random.choices() now raises a ValueError when all the weights
14428 - bpo-38876: Raise pickle.UnpicklingError when loading an item from memo for
14438 - bpo-38688: Calling func:`shutil.copytree` to copy a directory tree from
14444 - bpo-38863: Improve :func:`is_cgi` function in :mod:`http.server`, which
14445   enables processing the case that cgi directory is a child of another
14448 - bpo-37838: :meth:`typing.get_type_hints` properly handles functions
14451 - bpo-38870: Expose :func:`ast.unparse` as a function of the :mod:`ast`
14456 - bpo-38859: AsyncMock now returns StopAsyncIteration on the exhaustion of a
14457   side_effects iterable. Since PEP-479 its Impossible to raise a
14460 - bpo-38857: AsyncMock fix for return values that are awaitable types.  This
14463   were being awaited instead of being returned as is.
14465 - bpo-38834: :class:`typing.TypedDict` subclasses now track which keys are
14468   Zac Hatfield-Dodds.
14470 - bpo-38821: Fix unhandled exceptions in :mod:`argparse` when
14472   special (non-integer) values. Patch by Federico Bond.
14474 - bpo-38820: Make Python compatible with OpenSSL 3.0.0.
14478 - bpo-38811: Fix an unhandled exception in :mod:`pathlib` when
14479   :meth:`os.link` is missing. Patch by Toke Høiland-Jørgensen.
14481 - bpo-38686: Added support for multiple ``qop`` values in
14484 - bpo-38712: Add the Linux-specific :func:`signal.pidfd_send_signal`
14488 - bpo-38348: Add ``-i`` and ``--indent`` (indentation level), and
14489   ``--no-type-comments`` (type comments) command line options to ast parsing
14492 - bpo-37523: Change :class:`zipfile.ZipExtFile` to raise ``ValueError`` when
14494   new behavior is consistent with how accessing closed files is handled in
14497 - bpo-38045: Improve the performance of :func:`enum._decompose` in
14500 - bpo-36820: Break cycle generated when saving an exception in socket.py,
14504 - bpo-36406: Handle namespace packages in :mod:`doctest`. Patch by
14507 - bpo-34776: Fix dataclasses to support forward references in type
14510 - bpo-20928: ElementTree supports recursive XInclude processing.  Patch by
14513 - bpo-29636: Add whitespace options for formatting JSON with the
14515   supported: ``--indent`` for setting the indent level in spaces; ``--tab``
14516   for indenting with tabs; ``--no-indent`` for suppressing newlines; and
14517   ``--compact`` for suppressing all whitespace. The default behavior remains
14518   the same as ``--indent=4``.
14521 -------------
14523 - bpo-38928: Correct when venv's ``upgrade_dependencies()`` and
14524   ``--upgrade-deps`` are added.
14526 - bpo-38899: Update documentation to state that to activate virtual
14530 - bpo-22377: Improves documentation of the values that
14535 -----
14537 - bpo-38546: Fix test_ressources_gced_in_workers() of
14541 - bpo-38546: Multiprocessing and concurrent.futures tests now stop the
14544 - bpo-38614: Replace hardcoded timeout constants in tests with new
14552 - bpo-38547: Fix test_pty: if the process is the session leader, closing the
14556 - bpo-38992: Fix a test for :func:`math.fsum` that was failing due to
14559 - bpo-38991: :mod:`test.support`:
14566 - bpo-38965: Fix test_faulthandler on GCC 10. Use the "volatile" keyword in
14570 - bpo-38875: test_capi: trashcan tests now require the test "cpu" resource.
14572 - bpo-38841: Skip asyncio test_create_datagram_endpoint_existing_sock_unix
14575 - bpo-38692: Skip the test_posix.test_pidfd_open() test if
14580 - bpo-38839: Fix some unused functions in tests. Patch by Adam Johnson.
14582 - bpo-38669: Raise :exc:`TypeError` when passing target as a string with
14585 - bpo-37957: test.regrtest now can receive a list of test patterns to ignore
14586   (using the -i/--ignore argument) or a file with a list of patterns to
14587   ignore (using the --ignore-file argument). Patch by Pablo Galindo.
14590 -----
14592 - bpo-37404: :mod:`asyncio` now raises :exc:`TyperError` when calling
14596 - bpo-36500: Added an optional "regen" project to the Visual Studio solution
14600 -------
14602 - bpo-39007: Add auditing events to functions in :mod:`winreg`.
14604 - bpo-33125: Add support for building and releasing Windows ARM64 packages.
14607 -----
14609 - bpo-37931: Fixed a crash on OSX dynamic builds that occurred when
14610   re-initializing the posix module after a Py_Finalize if the environment
14614 ----
14616 - bpo-38944: Escape key now closes IDLE completion windows.  Patch by Johnny
14619 - bpo-38943: Fix IDLE autocomplete windows not always appearing on some
14622 - bpo-38862: 'Strip Trailing Whitespace' on the Format menu removes extra
14623   newlines at the end of non-shell files.
14625 - bpo-38636: Fix IDLE Format menu tab toggle and file indent width. These
14626   functions (default shortcuts Alt-T and Alt-U) were mistakenly disabled in
14630 -----
14632 - bpo-38896: Remove ``PyUnicode_ClearFreeList()`` function: the Unicode free
14635 - bpo-37340: Remove ``PyMethod_ClearFreeList()`` and
14639 - bpo-38835: Exclude ``PyFPE_START_PROTECT()`` and ``PyFPE_END_PROTECT()``
14646 *Release date: 2019-11-19*
14649 --------
14651 - bpo-38722: :mod:`runpy` now uses :meth:`io.open_code` to open code files.
14654 - bpo-38622: Add additional audit events for the :mod:`ctypes` module.
14656 - bpo-38418: Fixes audit event for :func:`os.system` to be named
14659 - bpo-38243: Escape the server title of
14661   HTML. (Contributed by Dong-hee Na in :issue:`38243`.)
14663 - bpo-38174: Update vendorized expat library version to 2.2.8, which
14664   resolves CVE-2019-15903.
14666 - bpo-37764: Fixes email._header_value_parser.get_unstructured going into an
14671 - bpo-37461: Fix an infinite loop when parsing specially crafted email
14674 - bpo-37363: Adds audit events for the range of supported run commands (see
14675   :ref:`using-on-general`).
14677 - bpo-37463: ssl.match_hostname() no longer accepts IPv4 addresses with
14678   additional text after the address and only quad-dotted notation without
14682 - bpo-37363: Adds audit events for :mod:`ensurepip`, :mod:`ftplib`,
14688 - bpo-37364: :func:`io.open_code` is now used when reading :file:`.pth`
14691 - bpo-34631: Updated OpenSSL to 1.1.1c in Windows installer
14693 - bpo-34155: Fix parsing of invalid email addresses with more than one ``@``
14698 -----------------
14700 - bpo-38631: Replace ``Py_FatalError()`` call with a regular
14703 - bpo-38639: Optimized :func:`math.floor()`, :func:`math.ceil()` and
14706 - bpo-38640: Fixed a bug in the compiler that was causing to raise in the
14710 - bpo-38613: Optimized some set operations (e.g. ``|``, ``^``, and ``-``) of
14714 - bpo-28029: ``"".replace("", s, n)`` now returns ``s`` instead of an empty
14715   string for all non-zero ``n``.  There are similar changes for
14718 - bpo-38535: Fixed line numbers and column offsets for AST nodes for calls
14721 - bpo-38525: Fix a segmentation fault when using reverse iterators of empty
14722   ``dict`` objects. Patch by Dong-hee Na and Inada Naoki.
14724 - bpo-38465: :class:`bytearray`, :class:`~array.array` and
14728 - bpo-38469: Fixed a bug where the scope of named expressions was not being
14732 - bpo-38437: Activate the ``GC_DEBUG`` macro for debug builds of the
14733   interpreter (when ``Py_DEBUG`` is set). Patch by Pablo Galindo.
14735 - bpo-38379: When the garbage collector makes a collection in which some
14741 - bpo-38379: When cyclic garbage collection (gc) runs finalizers that
14748 - bpo-38392: In debug mode, :c:func:`PyObject_GC_Track` now calls
14749   ``tp_traverse()`` of the object type to ensure that the object is valid:
14752 - bpo-38210: Remove unnecessary intersection and update set operation in
14753   dictview with empty set. (Contributed by Dong-hee Na in :issue:`38210`.)
14755 - bpo-38402: Check the error from the system's underlying ``crypt`` or
14758 - bpo-37474: On FreeBSD, Python no longer calls ``fedisableexcept()`` at
14762 - bpo-38006: Fix a bug due to the interaction of weakrefs and the cyclic
14766 - bpo-38317: Fix warnings options priority: ``PyConfig.warnoptions`` has the
14769 - bpo-38310: Predict ``BUILD_MAP_UNPACK_WITH_CALL`` -> ``CALL_FUNCTION_EX``
14772 - bpo-36871: Improve error handling for the assert_has_calls and
14777 - bpo-11410: Better control over symbol visibility is provided through use
14780   updated to compile with -fvisibility=hidden, minimising exported symbols.
14782 - bpo-38219: Optimized the :class:`dict` constructor and the
14783   :meth:`~dict.update` method for the case when the argument is a dict.
14785 - bpo-38236: Python now dumps path configuration if it fails to import the
14788 - bpo-38013: Allow to call ``async_generator_athrow().throw(...)`` even for
14789   non-started async generator helper. It fixes annoying warning at the end
14792 - bpo-38124: Fix an off-by-one error in PyState_AddModule that could cause
14793   out-of-bounds memory access.
14795 - bpo-38116: The select module is now PEP-384 compliant and no longer has
14798 - bpo-38113: ast module updated to PEP-384 and all statics removed
14800 - bpo-38076: The struct module is now PEP-384 compatible
14802 - bpo-38075: The random module is now PEP-384 compatible
14804 - bpo-38074: zlib module made PEP-384 compatible
14806 - bpo-38073: Make pwd extension module PEP-384 compatible
14808 - bpo-38072: grp module made PEP-384 compatible
14810 - bpo-38069: Make _posixsubprocess PEP-384 compatible
14812 - bpo-38071: Make termios extension module PEP-384 compatible
14814 - bpo-38005: Fixed comparing and creating of InterpreterID and ChannelID.
14816 - bpo-36946: Fix possible signed integer overflow when handling slices.
14819 - bpo-37994: Fixed silencing arbitrary errors if an attribute lookup fails
14822 - bpo-8425: Optimize set difference_update for the case when the other set
14823   is much larger than the base set.  (Suggested by Evgeny Kapun with code
14826 - bpo-37966: The implementation of :func:`~unicodedata.is_normalized` has
14828   the full normalization-quick-check algorithm from the Unicode standard.
14830 - bpo-37947: Adjust correctly the recursion level in the symtable generation
14833 - bpo-37812: The ``CHECK_SMALL_INT`` macro used inside
14837 - bpo-37751: Fix :func:`codecs.lookup` to normalize the encoding name the
14841 - bpo-37830: Fixed compilation of :keyword:`break` and :keyword:`continue`
14843   block contains :keyword:`return` with a non-constant value.
14845 - bpo-20490: Improve import error message for partially initialized module
14846   on circular ``from`` imports - by Anthony Sottile.
14848 - bpo-37840: Fix handling of negative indices in
14852 - bpo-37802: Slightly improve performance of
14856 - bpo-37409: Ensure explicit relative imports from interactive sessions and
14860 - bpo-32912: Reverted :issue:`32912`: emitting :exc:`SyntaxWarning` instead
14864 - bpo-37757: :pep:`572`: As described in the PEP, assignment expressions now
14872 - bpo-36279: Fix potential use of uninitialized memory in :func:`os.wait3`.
14874 - bpo-36311: Decoding bytes objects larger than 2GiB is faster and no longer
14877 - bpo-34880: The :keyword:`assert` statement now works properly if the
14878   :exc:`AssertionError` exception is being shadowed. Patch by Zackery Spytz.
14880 - bpo-37340: Removed object cache (``free_list``) for bound method objects.
14884 - bpo-37648: Fixed minor inconsistency in :meth:`list.__contains__`,
14886   is now always at the left and the needle is on the right of ``==``.
14888 - bpo-37444: Update differing exception between :meth:`builtins.__import__`
14891 - bpo-37619: When adding a wrapper descriptor from one class to a different
14893   subclass), an exception is correctly raised when the operator is called.
14895 - bpo-37593: Swap the positions of the *posonlyargs* and *args* parameters
14898 - bpo-37543: Optimized pymalloc for non PGO build.
14900 - bpo-37537: Compute allocated pymalloc blocks inside
14904 - bpo-37467: Fix :func:`sys.excepthook` and :c:func:`PyErr_Display` if a
14905   filename is a bytes string. For example, for a SyntaxError exception where
14906   the filename attribute is a bytes string.
14908 - bpo-37433: Fix ``SyntaxError`` indicator printing too many spaces for
14909   multi-line strings - by Anthony Sottile.
14911 - bpo-37417: :meth:`bytearray.extend` now correctly handles errors that
14914 - bpo-37414: The undocumented ``sys.callstats()`` function has been removed.
14919 - bpo-37392: Remove ``sys.getcheckinterval()`` and
14925 - bpo-37388: In development mode and in debug build, *encoding* and *errors*
14929   By default, for best performances, the *errors* argument is only checked
14930   at the first encoding/decoding error, and the *encoding* argument is
14933 - bpo-37348: Optimized decoding short ASCII string with UTF-8 and ascii
14934   codecs. ``b"foo".decode()`` is about 15% faster.  Patch by Inada Naoki.
14936 - bpo-24214: Improved support of the surrogatepass error handler in the
14937   UTF-8 and UTF-16 incremental decoders.
14939 - bpo-37330: :func:`open`, :func:`io.open`, :func:`codecs.open` and
14943 - bpo-35224: Reverse evaluation order of key: value in dict comprehensions
14947 - bpo-37316: Fix the :c:func:`PySys_Audit` call in :class:`mmap.mmap`.
14949 - bpo-37300: Remove an unnecessary Py_XINCREF in classobject.c.
14951 - bpo-37269: Fix a bug in the peephole optimizer that was not treating
14955 - bpo-20443: Python now gets the absolute path of the script filename
14960 - bpo-37257: Python's small object allocator (``obmalloc.c``) now allows (no
14965 - bpo-37231: The dispatching of type slots to special methods (for example
14968 - bpo-36974: Implemented separate vectorcall functions for every calling
14972 - bpo-37213: Handle correctly negative line offsets in the peephole
14975 - bpo-37219: Remove erroneous optimization for empty set differences.
14977 - bpo-15913: Implement :c:func:`PyBuffer_SizeFromFormat()` function
14981 - bpo-36922: Slot functions optimize any callable with
14985 - bpo-36974: The slot ``tp_vectorcall_offset`` is inherited unconditionally
14988 - bpo-37160: :func:`threading.get_native_id` now also supports NetBSD.
14990 - bpo-37077: Add :func:`threading.get_native_id` support for AIX. Patch by
14993 - bpo-36781: :func:`sum` has been optimized for boolean values.
14995 - bpo-34556: Add ``--upgrade-deps`` to venv module. Patch by Cooper Ry Lees
14997 - bpo-20523: ``pdb.Pdb`` supports ~/.pdbrc in Windows 7. Patch by Tim Hopper
14998   and Dan Lidral-Porter.
15000 - bpo-35551: Updated encodings: - Removed the "tis260" encoding, which was
15001   an alias for the nonexistent "tactis" codec. - Added "mac_centeuro" as an
15004 - bpo-19072: The :class:`classmethod` decorator can now wrap other
15008 - bpo-27575: Improve speed of dictview intersection by directly using set
15011 - bpo-30773: Prohibit parallel running of aclose() / asend() / athrow(). Fix
15015 -------
15017 - bpo-36589: The :func:`curses.update_lines_cols` function now returns
15020 - bpo-38807: Update :exc:`TypeError` messages for :meth:`os.path.join` to
15023 - bpo-38724: Add a repr for ``subprocess.Popen`` objects. Patch by Andrey
15026 - bpo-38786: pydoc now recognizes and parses HTTPS URLs. Patch by python273.
15028 - bpo-38785: Prevent asyncio from crashing if parent ``__init__`` is not
15031 - bpo-38723: :mod:`pdb` now uses :meth:`io.open_code` to trigger auditing
15034 - bpo-27805: Allow opening pipes and other non-seekable files in append mode
15037 - bpo-38438: Simplify the :mod:`argparse` usage message for ``nargs="*"``.
15039 - bpo-38761: WeakSet is now registered as a collections.abc.MutableSet.
15041 - bpo-38716: logging: change RotatingHandler namer and rotator to
15042   class-level attributes. This stops __init__ from setting them to None in
15045 - bpo-38713: Add :data:`os.P_PIDFD` constant, which may be passed to
15048 - bpo-38692: Add :class:`asyncio.PidfdChildWatcher`, a Linux-specific child
15051 - bpo-38692: Expose the Linux ``pidfd_open`` syscall as
15054 - bpo-38602: Added constants :data:`~fcntl.F_OFD_GETLK`,
15056   :mod:`fcntl` module. Patch by Dong-hee Na.
15058 - bpo-38334: Fixed seeking backward on an encrypted
15061 - bpo-38312: Add :func:`curses.get_escdelay`, :func:`curses.set_escdelay`,
15062   :func:`curses.get_tabsize`, and :func:`curses.set_tabsize` functions - by
15065 - bpo-38586: Now :func:`~logging.config.fileConfig` correctly sets the .name
15068 - bpo-38565: Add new cache_parameters() method for functools.lru_cache() to
15071 - bpo-34679: asynci.ProactorEventLoop.close() now only calls
15074 - bpo-31202: The case the result of :func:`pathlib.WindowsPath.glob` matches
15077 - bpo-36321: Remove misspelled attribute.  The 3.8 changelog noted that this
15080 - bpo-38521: Fixed erroneous equality comparison in statistics.NormalDist().
15082 - bpo-38493: Added :data:`~os.CLD_KILLED` and :data:`~os.CLD_STOPPED` for
15083   :attr:`si_code`. Patch by Dong-hee Na.
15085 - bpo-38478: Fixed a bug in :meth:`inspect.signature.bind` that was causing
15087   positional-only parameter. Patch by Pablo Galindo.
15089 - bpo-33604: Fixed `hmac.new` and `hmac.HMAC` to raise TypeError instead of
15090   ValueError when the digestmod parameter, now required in 3.8, is omitted.
15093 - bpo-38378: Parameters *out* and *in* of :func:`os.sendfile` was renamed to
15096 - bpo-38417: Added support for setting the umask in the child process to the
15099 - bpo-38449: Revert PR 15522, which introduces a regression in
15103 - bpo-38431: Fix ``__repr__`` method for :class:`dataclasses.InitVar` to
15106 - bpo-38109: Add missing :data:`stat.S_IFDOOR`, :data:`stat.S_IFPORT`,
15110 - bpo-38422: Clarify docstrings of pathlib suffix(es)
15112 - bpo-38405: Nested subclasses of :class:`typing.NamedTuple` are now
15115 - bpo-38332: Prevent :exc:`KeyError` thrown by :func:`_encoded_words.decode`
15116   when given an encoded-word with invalid content-type encoding from
15119 - bpo-38371: Deprecated the ``split()`` method in
15123 - bpo-38341: Add :exc:`smtplib.SMTPNotSupportedError` to the :mod:`smtplib`
15126 - bpo-38319: sendfile() used in socket and shutil modules was raising
15127   OverflowError for files >= 2GiB on 32-bit architectures.  (patch by
15130 - bpo-38242: Revert the new asyncio Streams API
15132 - bpo-13153: OS native encoding is now used for converting between Python
15134   clipboard emoji and other non-BMP characters.  Converting strings from Tcl
15137 - bpo-38019: Correctly handle pause/resume reading of closed asyncio unix
15140 - bpo-38163: Child mocks will now detect their type as either synchronous or
15145 - bpo-38161: Removes _AwaitEvent from AsyncMock.
15147 - bpo-38216: Allow the rare code that wants to send invalid http requests
15148   from the `http.client` library a way to do so.  The fixes for bpo-30458
15152 - bpo-28286: Deprecate opening :class:`~gzip.GzipFile` for writing
15155 - bpo-38108: Any synchronous magic methods on an AsyncMock now return a
15159 - bpo-38265: Update the *length* parameter of :func:`os.pread` to accept
15162 - bpo-38112: :mod:`compileall` has a higher default recursion limit and new
15163   command-line arguments for path manipulation, symlinks handling, and
15166 - bpo-38248: asyncio: Fix inconsistent immediate Task cancellation
15168 - bpo-38237: The arguments for the builtin pow function are more
15171 - bpo-34002: Improve efficiency in parts of email package by changing
15172   while-pop to a for loop, using isdisjoint instead of set intersections.
15174 - bpo-38191: Constructors of :class:`~typing.NamedTuple` and
15179 - bpo-38155: Add ``__all__`` to  :mod:`datetime`. Patch by Tahia Khan.
15181 - bpo-38185: Fixed case-insensitive string comparison in
15184 - bpo-38136: Changes AsyncMock call count and await count to be two
15186   awaited, not when it has been called, and vice-versa. Update the
15189 - bpo-37828: Fix default mock name in
15193 - bpo-38175: Fix a memory leak in comparison of :class:`sqlite3.Row`
15196 - bpo-33936: _hashlib no longer calls obsolete OpenSSL initialization
15199 - bpo-34706: Preserve subclassing in inspect.Signature.from_callable.
15201 - bpo-38153: Names of hashing algorithms from OpenSSL are now normalized to
15202   follow Python's naming conventions. For example OpenSSL uses sha3-512
15205 - bpo-38115: Fix a bug in dis.findlinestarts() where it would return invalid
15209 - bpo-38148: Add slots to :mod:`asyncio` transport classes, which can reduce
15212 - bpo-38142: The _hashlib OpenSSL wrapper extension module is now PEP-384
15215 - bpo-9216: hashlib constructors now support usedforsecurity flag to signal
15216   that a hashing algorithm is not used in a security context.
15218 - bpo-36991: Fixes a potential incorrect AttributeError exception escaping
15221 - bpo-38134: Remove obsolete copy of PBKDF2_HMAC_fast. All supported OpenSSL
15224 - bpo-38132: The OpenSSL hashlib wrapper uses a simpler implementation.
15226   OpenSSL's EVP. The algorithm name stays the same, except it is now always
15229 - bpo-38008: Fix parent class check in protocols to correctly identify the
15233 - bpo-34037: For :mod:`asyncio`, add a new coroutine
15239 - bpo-37405: Fixed regression bug for socket.getsockname() for non-CAN_ISOTP
15240   AF_CAN address family sockets by returning a 1-tuple instead of string.
15242 - bpo-38121: Update parameter names on functions in importlib.metadata
15245 - bpo-38110: The os.closewalk() implementation now uses the libc fdwalk()
15246   API on platforms where it is available.
15248 - bpo-38093: Fixes AsyncMock so it doesn't crash when used with
15251 - bpo-37488: Add warning to :meth:`datetime.utctimetuple`,
15254 - bpo-35640: Allow passing a :term:`path-like object` as ``directory``
15258 - bpo-38086: Update importlib.metadata with changes from `importlib_metadata
15260 …<https://gitlab.com/python-devs/importlib_metadata/blob/0.21/importlib_metadata/docs/changelog.rst…
15262 - bpo-37251: Remove `__code__` check in AsyncMock that incorrectly evaluated
15266 - bpo-38037: Fix reference counters in the :mod:`signal` module.
15268 - bpo-38066: Hide internal asyncio.Stream methods: feed_eof(), feed_data(),
15271 - bpo-38059: inspect.py now uses sys.exit() instead of exit()
15273 - bpo-38049: Added command-line interface for the :mod:`ast` module.
15275 - bpo-37953: In :mod:`typing`, improved the ``__hash__`` and ``__eq__``
15278 - bpo-38026: Fixed :func:`inspect.getattr_static` used ``isinstance`` while
15281 - bpo-35923: Update :class:`importlib.machinery.BuiltinImporter` to use
15282   ``loader._ORIGIN`` instead of a hardcoded value. Patch by Dong-hee Na.
15284 - bpo-38010: In ``importlib.metadata`` sync with ``importlib_metadata``
15286   requirement was returned for ``requires()`` on ``dist-info`` packages.
15288 - bpo-38006: weakref.WeakValueDictionary defines a local remove() function
15292 - bpo-37995: Added the *indent* option to :func:`ast.dump` which allows it
15295 - bpo-34410: Fixed a crash in the :func:`tee` iterator when re-enter it.
15296   RuntimeError is now raised in this case.
15298 - bpo-37140: Fix a ctypes regression of Python 3.8. When a ctypes.Structure
15299   is passed by copy to a function, ctypes internals created a temporary
15304 - bpo-37587: ``_json.scanstring`` is now up to 3x faster when there are many
15307 - bpo-37834: Prevent shutil.rmtree exception when built on non-Windows
15310 - bpo-10978: Semaphores and BoundedSemaphores can now release more than one
15313 - bpo-37972: Subscripts to the `unittest.mock.call` objects now receive the
15321 - bpo-37965: Fix C compiler warning caused by
15324 - bpo-37964: Add ``F_GETPATH`` command to :mod:`fcntl`.
15326 - bpo-37960: ``repr()`` of buffered and text streams now silences only
15329 - bpo-37961: Add a ``total_nframe`` field to the traces collected by the
15333 - bpo-37951: Most features of the subprocess module now work again in
15334   subinterpreters. Only *preexec_fn* is restricted in subinterpreters.
15336 - bpo-36205: Fix the rusage implementation of time.process_time() to
15339 - bpo-37950: Fix :func:`ast.dump` when call with incompletely initialized
15342 - bpo-34679: Restores instantiation of Windows IOCP event loops from the
15343   non-main thread.
15345 - bpo-36917: Add default implementation of the
15350 - bpo-37798: Update test_statistics.py to verify that the statistics module
15351   works well for both C and Python implementations. Patch by Dong-hee Na
15353 - bpo-26589: Added a new status code to the http module: 451
15356 - bpo-37915: Fix a segmentation fault that appeared when comparing instances
15360 - bpo-32554: Deprecate having random.seed() call hash on arbitrary types.
15362 - bpo-9938: Add optional keyword argument ``exit_on_error`` for
15365 - bpo-37851: The :mod:`faulthandler` module no longer allocates its
15366   alternative stack at Python startup. Now the stack is only allocated at
15369 - bpo-32793: Fix a duplicated debug message when
15370   :meth:`smtplib.SMTP.connect` is called.
15372 - bpo-37885: venv: Don't generate unset variable warning on deactivate.
15374 - bpo-37868: Fix dataclasses.is_dataclass when given an instance that never
15375   raises AttributeError in __getattr__.  That is, an object that returns
15378 - bpo-37811: Fix ``socket`` module's ``socket.connect(address)`` function
15381   take only non-negative integers and -1 as a timeout value.
15383 - bpo-37863: Optimizations for Fraction.__hash__ suggested by Tim Peters.
15385 - bpo-21131: Fix ``faulthandler.register(chain=True)`` stack. faulthandler
15391 - bpo-37798: Add C fastpath for statistics.NormalDist.inv_cdf() Patch by
15392   Dong-hee Na
15394 - bpo-37804: Remove the deprecated method `threading.Thread.isAlive()`.
15395   Patch by Dong-hee Na.
15397 - bpo-37819: Add Fraction.as_integer_ratio() to match the corresponding
15400 - bpo-14465: Add an xml.etree.ElementTree.indent() function for
15401   pretty-printing XML trees. Contributed by Stefan Behnel.
15403 - bpo-37810: Fix :mod:`difflib` ``?`` hint in diff output when dealing with
15406 - bpo-37772: In ``zipfile.Path``, when adding implicit dirs, ensure that
15409 - bpo-18578: Renamed and documented `test.bytecode_helper` as
15412 - bpo-37785: Fix xgettext warnings in :mod:`argparse`.
15414 - bpo-34488: :meth:`writelines` method of :class:`io.BytesIO` is now
15418 - bpo-37449: `ensurepip` now uses `importlib.resources.read_binary()` to
15421 - bpo-28292: Mark calendar.py helper functions as being private.  The
15425 - bpo-18049: Add definition of THREAD_STACK_SIZE for AIX in
15429 - bpo-37742: The logging.getLogger() API now returns the root logger when
15430   passed the name 'root', whereas previously it returned a non-root logger
15432   non-root logger named 'root', or instantiates a logger using
15433   logging.getLogger(__name__) in some top-level module called 'root.py'.
15435 - bpo-37738: Fix the implementation of curses ``addch(str, color_pair)``:
15439 - bpo-37723: Fix performance regression on regular expression parsing with
15442 - bpo-35943: The function :c:func:`PyImport_GetModule` now ensures any
15443   module it returns is fully initialized. Patch by Joannah Nanjekye.
15445 - bpo-32178: Fix IndexError in :mod:`email` package when trying to parse
15448 - bpo-37268: The :mod:`parser` module is deprecated and will be removed in
15451 - bpo-11953: Completing WSA* error codes in :mod:`socket`.
15453 - bpo-37685: Fixed comparisons of :class:`datetime.timedelta` and
15456 - bpo-37697: Synchronize ``importlib.metadata`` with `importlib_metadata
15458   <https://gitlab.com/python-devs/importlib_metadata/-/milestones/20>`_,
15459   improving handling of EGG-INFO files and fixing a crash when entry point
15462 - bpo-37695: Correct :func:`curses.unget_wch` error message.  Patch by
15465 - bpo-37689: Add :meth:`is_relative_to` in :class:`PurePath` to determine
15466   whether or not one path is relative to another.
15468 - bpo-29553: Fixed :meth:`argparse.ArgumentParser.format_usage` for mutually
15471 - bpo-37691: Let math.dist() accept coordinates as sequences (or iterables)
15474 - bpo-37685: Fixed ``__eq__``, ``__lt__`` etc implementations in some
15480 - bpo-37354: Make Activate.ps1 Powershell script static to allow for signing
15483 - bpo-37664: Update wheels bundled with ensurepip (pip 19.2.3 and setuptools
15486 - bpo-37663: Bring consistency to venv shell activation scripts by always
15489 - bpo-37642: Allowed the pure Python implementation of
15490   :class:`datetime.timezone` to represent sub-minute offsets close to
15492   and (-23:59, 24:00). Patch by Ngalim Siregar
15494 - bpo-36161: In :mod:`posix`, use ``ttyname_r`` instead of ``ttyname`` for
15497 - bpo-36324: Make internal attributes for statistics.NormalDist() private.
15499 - bpo-37555: Fix `NonCallableMock._call_matcher` returning tuple instead of
15503 - bpo-29446: Make `from tkinter import *` import only the expected objects.
15505 - bpo-16970: Adding a value error when an invalid value in passed to nargs
15508 - bpo-34443: Exceptions from :mod:`enum` now use the ``__qualname`` of the
15511 - bpo-37491: Fix ``IndexError`` when parsing email headers with unexpectedly
15512   ending bare-quoted string value. Patch by Abhilash Raj.
15514 - bpo-37587: Make json.loads faster for long strings. (Patch by Marco
15517 - bpo-18378: Recognize "UTF-8" as a valid value for LC_CTYPE in
15520 - bpo-37579: Return :exc:`NotImplemented` in Python implementation of
15522   when the other object being compared is not of the same type to match C
15525 - bpo-21478: Record calls to parent when autospecced object is attached to a
15529 - bpo-37531: "python3 -m test -jN --timeout=TIMEOUT" now kills a worker
15532 - bpo-37482: Fix serialization of display name in originator or destination
15535 - bpo-36993: Improve error reporting for corrupt zip files with bad zip64
15538 - bpo-37502: pickle.loads() no longer raises TypeError when the buffers
15539   argument is set to None
15541 - bpo-37520: Correct behavior for zipfile.Path.parent when the path object
15544 - bpo-18374: Fix the ``.col_offset`` attribute of nested :class:`ast.BinOp`
15547 - bpo-37424: Fixes a possible hang when using a timeout on
15553 - bpo-37421: Fix :func:`multiprocessing.util.get_temp_dir` finalizer: clear
15558 - bpo-37481: The distutils ``bdist_wininst`` command is deprecated in Python
15561 - bpo-37479: When `Enum.__str__` is overridden in a derived class, the
15565 - bpo-37440: http.client now enables TLS 1.3 post-handshake authentication
15566   for default context or if a cert_file is passed to HTTPSConnection.
15568 - bpo-37437: Update vendorized expat version to 2.2.7.
15570 - bpo-37428: SSLContext.post_handshake_auth = True no longer sets
15572   option is documented as ignored for clients, OpenSSL implicitly enables
15573   cert chain validation when the flag is set.
15575 - bpo-37420: :func:`os.sched_setaffinity` now correctly handles errors that
15578 - bpo-37412: The :func:`os.getcwdb` function now uses the UTF-8 encoding on
15580   The function is no longer deprecated on Windows.
15582 - bpo-37406: The sqlite3 module now raises TypeError, rather than
15583   ValueError, if operation argument type is not str: execute(),
15586 - bpo-29412: Fix IndexError in parsing a header value ending unexpectedly.
15589 - bpo-36546: The *dist* argument for statistics.quantiles() is now
15594 - bpo-37394: Fix a bug that was causing the :mod:`queue` module to fail if
15597 - bpo-37376: :mod:`pprint` now has support for
15600 - bpo-26967: An :class:`~argparse.ArgumentParser` with
15602   ``-vv``, but only disables abbreviation of long flags as documented. Patch
15603   by Zac Hatfield-Dodds.
15605 - bpo-37212: :func:`unittest.mock.call` now preserves the order of keyword
15608 - bpo-37372: Fix error unpickling datetime.time objects from Python 2 with
15611 - bpo-37345: Add formal support for UDPLITE sockets. Support was present
15612   before, but it is now easier to detect support with ``hasattr(socket,
15618 - bpo-37358: Optimized ``functools.partial`` by using vectorcall.
15620 - bpo-37347: :meth:`sqlite3.Connection.create_aggregate`,
15628 - bpo-37163: The *obj* argument of :func:`dataclasses.replace` is
15629   positional-only now.
15631 - bpo-37085: Add the optional Linux SocketCAN Broadcast Manager constants,
15635 - bpo-37328: ``HTMLParser.unescape`` is removed.  It was undocumented and
15638 - bpo-37305: Add .webmanifest -> application/manifest+json to list of
15641 - bpo-37320: ``aifc.openfp()`` alias to ``aifc.open()``, ``sunau.openfp()``
15645 - bpo-37315: Deprecated accepting floats with integral value (like ``5.0``)
15648 - bpo-37312: ``_dummy_thread`` and ``dummy_threading`` modules have been
15652 - bpo-33972: Email with single part but content-type set to ``multipart/*``
15655 - bpo-37280: Use threadpool for reading from file for sendfile fallback
15658 - bpo-37279: Fix asyncio sendfile support when sendfile sends extra data in
15661 - bpo-19865: :func:`ctypes.create_unicode_buffer()` now also supports
15662   non-BMP characters on platforms with 16-bit :c:type:`wchar_t` (for
15665 - bpo-37266: In a subinterpreter, spawning a daemon thread now raises an
15670 - bpo-37210: Allow pure Python implementation of :mod:`pickle` to work even
15671   when the C :mod:`_pickle` module is unavailable.
15673 - bpo-21872: Fix :mod:`lzma`: module decompresses data incompletely. When
15678 - bpo-35922: Fix :meth:`RobotFileParser.crawl_delay` and
15680   :exc:`AttributeError` when no relevant rule is defined in the robots.txt
15683 - bpo-35766: Change the format of feature_version to be a (major, minor)
15686 - bpo-36607: Eliminate :exc:`RuntimeError` raised by
15687   :func:`asyncio.all_tasks()` if internal tasks weak set is changed by
15690 - bpo-18748: :class:`_pyio.IOBase` destructor now does nothing if getting
15694 - bpo-36402: Fix a race condition at Python shutdown when waiting for
15695   threads. Wait until the Python thread state of all non-daemon threads get
15696   deleted (join all non-daemon threads), rather than just wait until
15697   non-daemon Python threads complete.
15699 - bpo-37206: Default values which cannot be represented as Python objects no
15702 - bpo-37111: Added ``encoding`` and ``errors`` keyword parameters to
15705 - bpo-12144: Ensure cookies with ``expires`` attribute are handled in
15708 - bpo-34886: Fix an unintended ValueError from :func:`subprocess.run` when
15714 - bpo-37173: The exception message for ``inspect.getfile()`` now correctly
15717 - bpo-37178: Give math.perm() a one argument form that means the same as
15720 - bpo-37178: For math.perm(n, k), let k default to n, giving the same result
15723 - bpo-37165: Converted _collections._count_elements to use the Argument
15726 - bpo-34767: Do not always create a :class:`collections.deque` in
15729 - bpo-37158: Speed-up statistics.fmean() by switching from a function to a
15732 - bpo-34282: Remove ``Enum._convert`` method, deprecated in 3.8.
15734 - bpo-37150: `argparse._ActionsContainer.add_argument` now throws error, if
15738 - bpo-28724: The socket module now has the :func:`socket.send_fds` and
15742 - bpo-35621: Support running asyncio subprocesses when execution event loop
15745 - bpo-36520: Lengthy email headers with UTF-8 characters are now properly
15748 - bpo-30835: Fixed a bug in email parsing where a message with invalid bytes
15749   in content-transfer-encoding of a multipart message can cause an
15752 - bpo-31163: pathlib.Path instance's rename and replace methods now return
15755 - bpo-25068: :class:`urllib.request.ProxyHandler` now lowercases the keys of
15758 - bpo-26185: Fix :func:`repr` on empty :class:`ZipInfo` object. Patch by
15761 - bpo-21315: Email headers containing RFC2047 encoded words are parsed
15763   trailing whitespace after encoded words is now registered as a defect.
15765 - bpo-31904: Port test_datetime to VxWorks: skip zoneinfo tests on VxWorks
15767 - bpo-35805: Add parser for Message-ID header and add it to default
15768   HeaderRegistry. This should prevent folding of Message-ID using RFC 2048
15771 - bpo-36871: Ensure method signature is used instead of constructor
15775 - bpo-35070: posix.getgrouplist() now works correctly when the user belongs
15778 - bpo-31783: Fix race condition in ThreadPoolExecutor when worker threads
15781 - bpo-36582: Fix ``UserString.encode()`` to correctly return ``bytes``
15784 - bpo-32424: Deprecate xml.etree.ElementTree.Element.copy() in favor of
15789 - bpo-36564: Fix infinite loop in email header folding logic that would be
15790   triggered when an email policy's max_line_length is not long enough to
15794 - bpo-36543: Removed methods Element.getchildren(), Element.getiterator()
15797 - bpo-36409: Remove the old plistlib API deprecated in Python 3.4
15799 - bpo-36302: distutils sorts source file lists so that Extension .so files
15802 - bpo-36250: Ignore ``ValueError`` from ``signal`` with ``interaction`` in
15803   non-main thread.
15805 - bpo-36046: Added ``user``, ``group`` and ``extra_groups`` parameters to
15808 - bpo-32627: Fix compile error when ``_uuid`` headers conflicting included.
15810 - bpo-35800: Deprecate ``smtpd.MailmanProxy`` ready for future removal.
15812 - bpo-35168: :attr:`shlex.shlex.punctuation_chars` is now a read-only
15815 - bpo-8538: Add support for boolean actions like ``--foo`` and ``--no-foo``
15818 - bpo-20504: Fixes a bug in :mod:`cgi` module when a multipart/form-data
15819   request has no `Content-Length` header.
15821 - bpo-25988: The abstract base classes in :mod:`collections.abc` no longer
15824 - bpo-11122: Distutils won't check for rpmbuild in specified paths only.
15826 - bpo-34775: Division handling of PurePath now returns NotImplemented
15830 - bpo-34749: :func:`binascii.a2b_base64` is now up to 2 times faster. Patch
15833 - bpo-34519: Add additional aliases for HP Roman 8. Patch by Michael Osipov.
15835 - bpo-28009: Fix uuid.getnode() on platforms with '.' as MAC Addr delimiter
15837   Currently, AIX is the only know platform with these settings. Patch by
15840 - bpo-30618: Add :meth:`~pathlib.Path.readlink`. Patch by Girts Folkmanis.
15842 - bpo-32498: Made :func:`urllib.parse.unquote()` accept bytes in addition to
15845 - bpo-33348: lib2to3 now recognizes expressions after ``*`` and `**` like in
15848 - bpo-32689: Update :func:`shutil.move` function to allow for Path objects
15852 - bpo-32820: Added __format__ to IPv4 and IPv6 classes.  Always outputs a
15853   fully zero- padded string. Supports b/x/n modifiers (bin/hex/native
15854   format).  Native format for IPv4 is bin, native format for IPv6 is hex.
15857 - bpo-27657: Fix urllib.parse.urlparse() with numeric paths. A string like
15858   "path:80" is no longer parsed as a path but as a scheme ("path") and a
15861 - bpo-4963: Fixed non-deterministic behavior related to mimetypes extension
15865 -------------
15867 - bpo-21767: Explicitly mention abc support in functools.singledispatch
15869 - bpo-38816: Provides more details about the interaction between
15870   :c:func:`fork` and CPython's runtime, focusing just on the C-API.  This
15874 - bpo-38351: Modernize :mod:`email` examples from %-formatting to f-strings.
15876 - bpo-38778: Document the fact that :exc:`RuntimeError` is raised if
15877   :meth:`os.fork` is called in a subinterpreter.
15879 - bpo-38592: Add Brazilian Portuguese to the language switcher at Python
15882 - bpo-38294: Add list of no-longer-escaped chars to re.escape documentation
15884 - bpo-38053: Modernized the plistlib documentation
15886 - bpo-26868: Fix example usage of :c:func:`PyModule_AddObject` to properly
15889 - bpo-36797: Fix a dead link in the distutils API Reference.
15891 - bpo-37977: Warn more strongly and clearly about pickle insecurity
15893 - bpo-37979: Added a link to dateutil.parser.isoparse in the
15896 - bpo-12707: Deprecate info(), geturl(), getcode() methods in favor of the
15901 - bpo-37937: Mention ``frame.f_trace`` in :func:`sys.settrace` docs.
15903 - bpo-37878: Make :c:func:`PyThreadState_DeleteCurrent` Internal.
15905 - bpo-37759: Beginning edits to Whatsnew 3.8
15907 - bpo-37726: Stop recommending getopt in the tutorial for command line
15910 - bpo-32910: Remove implementation-specific behaviour of how venv's
15913 - bpo-37256: Fix wording of arguments for :class:`Request` in
15916 - bpo-37284: Add a brief note to indicate that any new
15920 - bpo-30088: Documented that :class:`mailbox.Maildir` constructor doesn't
15924 - bpo-37521: Fix `importlib` examples to insert any newly created modules
15930 - bpo-37456: Slash ('/') is now part of syntax.
15932 - bpo-37487: Fix PyList_GetItem index description to include 0.
15934 - bpo-37149: Replace the dead link to the Tkinter 8.5 reference by John
15937 - bpo-37478: Added possible exceptions to the description of os.chdir().
15939 - bpo-34903: Documented that in :meth:`datetime.datetime.strptime()`, the
15940   leading zero in some two-digit formats is optional. Patch by Mike Gleen.
15942 - bpo-36260: Add decompression pitfalls to zipfile module documentation.
15944 - bpo-37004: In the documentation for difflib, a note was added explicitly
15948 - bpo-36960: Restructured the :mod:`datetime` docs in the interest of making
15949   them more user-friendly and improving readability. Patch by Brad Solomon.
15951 - bpo-36487: Make C-API docs clear about what the "main" interpreter is.
15953 - bpo-23460: The documentation for decimal string formatting using the `:g`
15957 - bpo-35803: Document and test that ``tempfile`` functions may accept a
15958   :term:`path-like object` for the ``dir`` argument.  Patch by Anthony
15961 - bpo-33944: Added a note about the intended use of code in .pth files.
15963 - bpo-34293: Fix the Doc/Makefile regarding PAPER environment variable and
15966 - bpo-25237: Add documentation for tkinter modules
15969 -----
15971 - bpo-38614: Fix test_communicate() of test_asyncio.test_subprocess: use
15974 - bpo-38614: Add timeout constants to :mod:`test.support`:
15980 - bpo-38502: test.regrtest now uses process groups in the multiprocessing
15981   mode (-jN command line option) if process groups are available: if
15984 - bpo-35998: Fix a race condition in test_asyncio.test_start_tls_server_1().
15987   ANSWER once it gets HELLO. Now, only the test main() function is
15990 - bpo-38470: Fix ``test_compileall.test_compile_dir_maxlevels()`` on Windows
15994 - bpo-37531: On timeout, regrtest no longer attempts to call
16000 - bpo-38239: Fix test_gdb for Link Time Optimization (LTO) builds.
16002 - bpo-38275: test_ssl now handles disabled TLS/SSL versions better.
16003   OpenSSL's crypto policy and run-time settings are recognized and tests for
16007 - bpo-38271: The private keys for test_ssl were encrypted with 3DES in
16012 - bpo-38270: test.support now has a helper function to check for
16015   when MD5 is disabled.
16017 - bpo-37123: Multiprocessing test test_mymanager() now also expects
16018   -SIGTERM, not only exitcode 0. BaseManager._finalize_manager() sends
16019   SIGTERM to the manager process if it takes longer than 1 second to stop,
16022 - bpo-38212: Multiprocessing tests: increase
16025 - bpo-38117: Test with OpenSSL 1.1.1d
16027 - bpo-38018: Increase code coverage for multiprocessing.shared_memory.
16029 - bpo-37805: Add tests for json.dump(..., skipkeys=True). Patch by Dong-hee
16032 - bpo-37531: Enhance regrtest multiprocess timeout: write a message when
16034   put a timeout on the second call to popen.communicate().
16036 - bpo-37876: Add tests for ROT-13 codec.
16038 - bpo-36833: Added tests for PyDateTime_xxx_GET_xxx() macros of the C API of
16041 - bpo-37558: Fix test_shared_memory_cleaned_after_process_termination name
16044 - bpo-37526: Add :func:`test.support.catch_threading_exception`: context
16048 - bpo-37421: test_concurrent_futures now explicitly stops the ForkServer
16051 - bpo-37421: multiprocessing tests now stop the ForkServer instance if it's
16055 - bpo-37421: test_distutils.test_build_ext() is now able to remove the
16059 - bpo-37421: test_concurrent_futures now cleans up multiprocessing to remove
16063 - bpo-37421: test_winconsoleio doesn't leak a temporary file anymore: use
16066 - bpo-37421: multiprocessing tests now explicitly call ``_run_finalizers()``
16069 - bpo-37421: urllib.request tests now call
16074 - bpo-37472: Remove ``Lib/test/outstanding_bugs.py``.
16076 - bpo-37199: Fix test failures when IPv6 is unavailable or disabled.
16078 - bpo-19696: Replace deprecated method "random.choose" with "random.choice"
16081 - bpo-37335: Remove no longer necessary code from c locale coercion tests
16083 - bpo-37421: Fix test_shutil to no longer leak temporary files.
16085 - bpo-37411: Fix test_wsgiref.testEnviron() to no longer depend on the
16086   environment variables (don't fail if "X" variable is set).
16088 - bpo-37400: Fix test_os.test_chown(): use os.getgroups() rather than
16091 - bpo-37359: Add --cleanup option to python3 -m test to remove
16093   cleantest" to run ``python3 -m test --cleanup``.
16095 - bpo-37362: test_gdb no longer fails if it gets an "unexpected" message on
16096   stderr: it now ignores stderr. The purpose of test_gdb is to test that
16097   python-gdb.py commands work as expected, not to test gdb.
16099 - bpo-35998: Avoid TimeoutError in test_asyncio: test_start_tls_server_1()
16101 - bpo-37278: Fix test_asyncio ProactorLoopCtrlC: join the thread to prevent
16104 - bpo-37261: Fix :func:`test.support.catch_unraisable_exception`: its
16108 - bpo-37069: regrtest now uses :func:`sys.unraisablehook` to mark a test as
16112   Use ``python3 -m test --fail-env-changed`` to catch unraisable exceptions
16115 - bpo-37252: Fix assertions in ``test_close`` and
16118 - bpo-37169: Rewrite ``_PyObject_IsFreed()`` unit tests.
16120 - bpo-37153: ``test_venv.test_multiprocessing()`` now explicitly calls
16123 - bpo-34001: Make test_ssl pass with LibreSSL. LibreSSL handles minimum and
16126 - bpo-36919: Make ``test_source_encoding.test_issue2301`` implementation
16129 - bpo-30202: Update ``test.test_importlib.test_abc`` to test
16132 - bpo-28009: Modify the test_uuid logic to test when a program is available
16135 - bpo-34596: Fallback to a default reason when :func:`unittest.skip` is
16139 -----
16141 - bpo-38809: On Windows, build scripts will now recognize and use python.exe
16144 - bpo-38684: Fix _hashlib build when Blake2 is disabled, but OpenSSL
16147 - bpo-38468: Misc/python-config.in now uses `getvar()` for all still
16150 - bpo-37415: Fix stdatomic.h header check for ICC compiler: the ICC
16151   implementation lacks atomic_uintptr_t type which is needed by Python.
16153 - bpo-38301: In Solaris family, we must be sure to use ``-D_REENTRANT``.
16156 - bpo-36002: Locate ``llvm-profdata`` and ``llvm-ar`` binaries using
16159 - bpo-37936: The :file:`.gitignore` file systematically keeps "rooted", with
16160   a non-trailing slash, all the rules that are meant to apply to files in a
16165 - bpo-37760: The :file:`Tools/unicode/makeunicodedata.py` script, which is
16169   ``dataclass`` with named attributes, rather than a length-18 list of
16172 - bpo-37936: The :file:`.gitignore` file no longer applies to any files that
16175 - bpo-37725: Change "clean" makefile target to also clean the program guided
16177   and "make profile-removal", or "make clobber".
16179 - bpo-37707: Mark some individual tests to skip when --pgo is used.  The
16183 - bpo-36044: Reduce the number of unit tests run for the PGO generation
16185   unit test suite is slow.  This change may result in a slightly less
16188   restored using './configure [..] PROFILE_TASK="-m test --pgo-extended"'.
16193 - bpo-37468: ``make install`` no longer installs ``wininst-*.exe`` files
16196 - bpo-37189: Many ``PyRun_XXX()`` functions like :c:func:`PyRun_String` were
16200 - bpo-25361: Enables use of SSE2 instructions in Windows 32-bit build.
16202 - bpo-36210: Update optional extension module detection for AIX. ossaudiodev
16204   missing. 3rd-party packaging of ncurses (with ASIS support) conflicts with
16211 -------
16213 - bpo-38589: Fixes HTML Help shortcut when Windows is not installed to C
16216 - bpo-38453: Ensure ntpath.realpath() correctly resolves relative paths.
16218 - bpo-38519: Restores the internal C headers that were missing from the
16221 - bpo-38492: Remove ``pythonw.exe`` dependency on the Microsoft C++ runtime.
16223 - bpo-38344: Fix error message in activate.bat
16225 - bpo-38359: Ensures ``pyw.exe`` launcher reads correct registry key.
16227 - bpo-38355: Fixes ``ntpath.realpath`` failing on ``sys.executable``.
16229 - bpo-38117: Update bundled OpenSSL to 1.1.1d
16231 - bpo-38092: Reduce overhead when using multiprocessing in a Windows virtual
16234 - bpo-38133: Allow py.exe launcher to locate installations from the
16237 - bpo-38114: The ``pip.ini`` is no longer included in the Nuget package.
16239 - bpo-32592: Set Windows 8 as the minimum required version for API support
16241 - bpo-36634: :func:`os.cpu_count` now returns active processors rather than
16244 - bpo-36634: venv activate.bat now works when the existing variables contain
16247 - bpo-38081: Prevent error calling :func:`os.path.realpath` on ``'NUL'``.
16249 - bpo-38087: Fix case sensitivity in test_pathlib and test_ntpath.
16251 - bpo-38088: Fixes distutils not finding vcruntime140.dll with only the v142
16254 - bpo-37283: Ensure command-line and unattend.xml setting override
16257 - bpo-38030: Fixes :func:`os.stat` failing for block devices on Windows
16259 - bpo-38020: Fixes potential crash when calling :func:`os.readlink` (or
16260   indirectly through :func:`~os.path.realpath`) on a file that is not a
16263 - bpo-37705: Improve the implementation of ``winerror_to_errno()``.
16265 - bpo-37549: :func:`os.dup` no longer fails for standard streams on Windows
16268 - bpo-1311: The ``nul`` file on Windows now returns True from
16272 - bpo-9949: Enable support for following symlinks in :func:`os.realpath`.
16274 - bpo-37834: Treat all name surrogate reparse points on Windows in
16278 - bpo-36266: Add the module name in the formatted error message when DLL
16282 - bpo-25172: Trying to import the :mod:`crypt` module on Windows will result
16285   module is not available, the ImportError will include a message explaining
16288 - bpo-37778: Fixes the icons used for file associations to the Microsoft
16291 - bpo-37734: Fix use of registry values to launch Python from Microsoft
16294 - bpo-37702: Fix memory leak on Windows in creating an SSLContext object or
16297 - bpo-37672: Switch Windows Store package's pip to use bundled
16300 - bpo-10945: Officially drop support for creating bdist_wininst installers
16301   on non-Windows systems.
16303 - bpo-37445: Include the ``FORMAT_MESSAGE_IGNORE_INSERTS`` flag in
16306 - bpo-37369: Fixes path for :data:`sys.executable` when running from the
16309 - bpo-37380: Don't collect unfinished processes with ``subprocess._active``
16312 - bpo-37351: Removes libpython38.a from standard Windows distribution.
16314 - bpo-35360: Update Windows builds to use SQLite 3.28.0.
16316 - bpo-37267: On Windows, :func:`os.dup` no longer creates an inheritable fd
16319 - bpo-36779: Ensure ``time.tzname`` is correct on Windows when the active
16320   code page is set to CP_UTF7 or CP_UTF8.
16322 - bpo-32587: Make :data:`winreg.REG_MULTI_SZ` support zero-length strings.
16324 - bpo-28269: Replace use of :c:func:`strcasecmp` for the system function
16327 - bpo-36590: Add native Bluetooth RFCOMM support to socket module.
16330 -----
16332 - bpo-38117: Updated OpenSSL to 1.1.1d in macOS installer.
16334 - bpo-38089: Move Azure Pipelines to latest VM versions and make macOS tests
16337 - bpo-18049: Increase the default stack size of threads from 5MB to 16MB on
16341 - bpo-34602: Avoid test suite failures on macOS by no longer calling
16343   The runtime change is no longer needed since the interpreter is being
16346 - bpo-35360: Update macOS installer to use SQLite 3.28.0.
16348 - bpo-34631: Updated OpenSSL to 1.1.1c in macOS installer.
16351 ----
16353 - bpo-26353: Stop adding newline when saving an IDLE shell window.
16355 - bpo-4630: Add an option to toggle IDLE's cursor blink for shell, editor,
16359 - bpo-38598: Do not try to compile IDLE shell or output windows
16361 - bpo-36698: IDLE no longer fails when write non-encodable characters to
16365 - bpo-35379: When exiting IDLE, catch any AttributeError.  One happens when
16366   EditorWindow.close is called twice.  Printing a traceback, when IDLE is
16367   run from a terminal, is useless and annoying.
16369 - bpo-38183: To avoid problems, test_idle ignores the user config directory.
16373 - bpo-38077: IDLE no longer adds 'argv' to the user namespace when
16376 - bpo-38041: Shell restart lines now fill the window width, always start
16378   the included file name is long relative to the width.
16380 - bpo-35771: To avoid occasional spurious test_idle failures on slower
16383 - bpo-37824: Properly handle user input warnings in IDLE shell. Cease
16386 - bpo-37929: IDLE Settings dialog now closes properly when there is no shell
16389 - bpo-37902: Add mousewheel scrolling for IDLE module, path, and stack
16392 - bpo-37849: Fixed completions list appearing too high or low when shown
16395 - bpo-36419: Refactor IDLE autocomplete and improve testing.
16397 - bpo-37748: Reorder the Run menu.  Put the most common choice, Run Module,
16400 - bpo-37692: Improve highlight config sample with example shell interaction
16403 - bpo-37628: Settings dialog no longer expands with font size.
16405 - bpo-37627: Initialize the Customize Run dialog with the command line
16409 - bpo-33610: Fix code context not showing the correct context when first
16412 - bpo-37530: Optimize code context to reduce unneeded background activity.
16416 - bpo-27452: Cleanup ``config.py`` by inlining ``RemoveFile`` and
16419 - bpo-37325: Fix tab focus traversal order for help source and custom run
16422 - bpo-37321: Both subprocess connection error messages now refer to the
16425 - bpo-17535: Add optional line numbers for IDLE editor windows.  Windows
16429 - bpo-26806: To compensate for stack frames added by IDLE and avoid possible
16434 - bpo-37177: Properly 'attach' search dialogs to their main window so that
16438 - bpo-37039: Adjust "Zoom Height" to individual screens by momentarily
16440   screen settings may invalidate the saved height.  While a window is
16443 - bpo-35763: Make calltip reminder about '/' meaning positional-only less
16444   obtrusive by only adding it when there is room on the first line.
16446 - bpo-5680: Add 'Run... Customized' to the Run menu to run a module with
16450 - bpo-36390: Gather Format menu functions into format.py.  Combine
16454 -----------
16456 - bpo-38118: Update Valgrind suppression file to ignore a false alarm in
16459 - bpo-38347: pathfix.py: Assume all files that end on '.py' are Python
16462 - bpo-37803: pdb's ``--help`` and ``--version`` long options now work.
16464 - bpo-37942: Improve ArgumentClinic converter for floats.
16466 - bpo-37704: Remove ``Tools/scripts/h2py.py``: use cffi to access a C API in
16469 - bpo-37675: 2to3 now works when run from a zipped standard library.
16471 - bpo-37034: Argument Clinic now uses the argument name on errors with
16472   keyword-only argument instead of their position. Patch contributed by Rémi
16475 - bpo-37064: Add option -k to pathscript.py script: preserve shebang flags.
16476   Add option -a to pathscript.py script: add flags.
16479 -----
16481 - bpo-37633: Re-export some function compatibility wrappers for macros in
16484 - bpo-38644: Provide :c:func:`Py_EnterRecursiveCall` and
16490 - bpo-38650: The global variable :c:data:`PyStructSequence_UnnamedField` is
16493 - bpo-38540: Fixed possible leak in :c:func:`PyArg_Parse` and similar
16495   :c:macro:`PY_SSIZE_T_CLEAN` is not defined.
16497 - bpo-38395: Fix a crash in :class:`weakref.proxy` objects due to incorrect
16502 - bpo-36389: The ``_PyObject_CheckConsistency()`` function is now also
16506 - bpo-38266: Revert the removal of PyThreadState_DeleteCurrent() with
16509 - bpo-38303: Update audioop extension module to use the stable ABI
16510   (PEP-384). Patch by Tyler Kieft.
16512 - bpo-38234: :c:func:`Py_SetPath` now sets :data:`sys.executable` to the
16516 - bpo-38234: Python ignored arguments passed to :c:func:`Py_SetPath`,
16520 - bpo-38205: The :c:func:`Py_UNREACHABLE` macro now calls
16523 - bpo-38140: Make dict and weakref offsets opaque for C heap types by
16526 - bpo-15088: The C function ``PyGen_NeedsFinalizing`` has been removed. It
16531 - bpo-36763: Options added by ``PySys_AddXOption()`` are now handled the
16532   same way than ``PyConfig.xoptions`` and command line ``-X`` options.
16534 - bpo-37926: Fix a crash in ``PySys_SetArgvEx(0, NULL, 0)``.
16536 - bpo-37879: Fix subtype_dealloc to suppress the type decref when the base
16537   type is a C heap type
16539 - bpo-37645: Add :c:func:`_PyObject_FunctionStr` to get a user-friendly
16540   string representation of a function-like object. Patch by Jeroen Demeyer.
16542 - bpo-29548: The functions ``PyEval_CallObject``, ``PyEval_CallFunction``,
16546 - bpo-37151: ``PyCFunction_Call`` is now a deprecated alias of
16549 - bpo-37540: The vectorcall protocol now requires that the caller passes
16552 - bpo-37207: The vectorcall protocol is now enabled for ``type`` objects:
16556 - bpo-21120: Exclude Python-ast.h, ast.h and asdl.h from the limited API.
16558 - bpo-37483: Add new function ``_PyObject_CallOneArg`` for calling an object
16561 - bpo-36763: Add :func:`PyConfig_SetWideStringList` function.
16563 - bpo-37337: Add fast functions for calling methods:
16567 - bpo-28805: The :const:`METH_FASTCALL` calling convention has been
16570 - bpo-37221: The new function :c:func:`PyCode_NewWithPosOnlyArgs` allows to
16572   *posonlyargcount* parameter for indicating the number of positonal-only
16575 - bpo-37215: Fix dtrace issue introduce by bpo-36842
16577 - bpo-37194: Add a new public :c:func:`PyObject_CallNoArgs` function to the
16578   C API: call a callable Python object without any arguments. It is the most
16579   efficient way to call a callback without any argument. On x86-64, for
16584 - bpo-37170: Fix the cast on error in
16587 - bpo-35381: Convert posixmodule.c statically allocated types
16588   ``DirEntryType`` and ``ScandirIteratorType`` to heap-allocated types.
16590 - bpo-34331: Use singular/plural noun in error message when instantiating an
16591   abstract class with non-overriden abstract method(s).
16597 *Release date: 2019-06-04*
16600 --------
16602 - bpo-35907: CVE-2019-9948: Avoid file reading by disallowing
16603   ``local-file://`` and ``local_file://`` URL schemes in
16607 - bpo-33529: Prevent fold function used in email header encoding from
16608   entering infinite loop when there are too many non-ASCII characters in a
16611 - bpo-33164: Updated blake2 implementation which uses secure memset
16615 -----------------
16617 - bpo-35814: Allow unpacking in the right hand side of annotated
16618   assignments. In particular, ``t: Tuple[int, ...] = x, y, *z`` is now
16621 - bpo-37126: All structseq objects are now tracked by the garbage collector.
16624 - bpo-37122: Make the *co_argcount* attribute of code objects represent the
16625   total number of positional arguments (including positional-only
16627   which arguments are positional only, and the difference (*co_argcount* -
16628   *co_posonlyargcount*) is the number of positional-or-keyword arguments.
16631 - bpo-20092: Constructors of :class:`int`, :class:`float` and
16634   :meth:`~object.__float__` or :meth:`~object.__complex__` is not available.
16636 - bpo-37087: Add native thread ID (TID) support to OpenBSD.
16638 - bpo-26219: Implemented per opcode cache mechanism and ``LOAD_GLOBAL``
16639   instruction use it. ``LOAD_GLOBAL`` is now about 40% faster. Contributed
16642 - bpo-37072: Fix crash in PyAST_FromNodeObject() when flags is NULL.
16644 - bpo-37029: Freeing a great many small objects could take time quadratic in
16647   This is accomplished without search now, leaving the worst-case time
16653 - bpo-26423: Fix possible overflow in ``wrap_lenfunc()`` when ``sizeof(long)
16654   < sizeof(Py_ssize_t)`` (e.g., 64-bit Windows).
16656 - bpo-37050: Improve the AST for "debug" f-strings, which use '=' to print
16659   merged with adjacent constant expressions inside the f-string).
16661 - bpo-22385: The `bytes.hex`, `bytearray.hex`, and `memoryview.hex` methods
16666 - bpo-26836: Add :func:`os.memfd_create`.
16668 - bpo-37032: Added new ``replace()`` method to the code type
16671 - bpo-37007: Implement :func:`socket.if_nameindex()`,
16675 - bpo-36829: :c:func:`PyErr_WriteUnraisable` now creates a traceback object
16676   if there is no current traceback. Moreover, call
16680 - bpo-36878: Only accept text after `# type: ignore` if the first character
16681   is ASCII. This is to disallow things like `# type: ignoreé`.
16683 - bpo-36878: Store text appearing after a `# type: ignore` comment in the
16687 - bpo-2180: Treat line continuation at EOF as a ``SyntaxError`` by Anthony
16690 - bpo-36907: Fix a crash when calling a C function with a keyword dict
16691   (``f(**kwargs)``) and changing the dict ``kwargs`` while that function is
16694 - bpo-36946: Fix possible signed integer overflow when handling slices.
16696 - bpo-36826: Add NamedExpression kind support to ast_unparse.c
16698 - bpo-1875: A :exc:`SyntaxError` is now raised if a code blocks that will be
16702 - bpo-36027: Allow computation of modular inverses via three-argument
16703   ``pow``: the second argument is now permitted to be negative in the case
16706 - bpo-36861: Update the Unicode database to version 12.1.0.
16708 - bpo-28866: Avoid caching attributes of classes which type defines mro() to
16711 - bpo-36851: The ``FrameType`` stack is now correctly cleaned up if the
16712   execution ends with a return and the stack is not empty.
16714 - bpo-34616: The ``compile()`` builtin functions now support the
16716   that  contains top-level ``await``, ``async with`` or ``async for``. This
16717   is useful to evaluate async-code from with an already async functions; for
16720 - bpo-36842: Implement PEP 578, adding sys.audit, io.open_code and related
16723 - bpo-27639: Correct return type for UserList slicing operations. Patch by
16726 - bpo-36737: Move PyRuntimeState.warnings into per-interpreter state (via
16729 - bpo-36793: Removed ``__str__`` implementations from builtin types
16734 - bpo-36817: Add a ``=`` feature f-strings for debugging. This can precede
16738   ``'3*9+15=42'``.  If ``=`` is specified, the default conversion is set to
16739   ``!r``, unless a format spec is given, in which case the formatting
16740   behavior is unchanged, and __format__ will be used.
16742 - bpo-24048: Save the live exception during import.c's ``remove_module()``.
16744 - bpo-27987: pymalloc returns memory blocks aligned by 16 bytes, instead of
16745   8 bytes, on 64-bit platforms to conform x86-64 ABI. Recent compilers
16748 - bpo-36601: A long-since-meaningless check for ``getpid() == main_pid`` was
16751 - bpo-36594: Fix incorrect use of ``%p`` in format strings. Patch by Zackery
16754 - bpo-36045: builtins.help() now prefixes `async` for async functions
16756 - bpo-36084: Add native thread ID (TID) to threading.Thread objects
16759 - bpo-36035: Added fix for broken symlinks in combination with pathlib
16761 - bpo-35983: Added new trashcan macros to deal with a double deallocation
16766 - bpo-20602: Do not clear :data:`sys.flags` and :data:`sys.float_info`
16769 - bpo-26826: Expose :func:`copy_file_range` as a low level API in the
16772 - bpo-32388: Remove cross-version binary compatibility requirement in
16775 - bpo-31862: Port binascii to PEP 489 multiphase initialization. Patch by
16779 -------
16781 - bpo-37128: Added :func:`math.perm`.
16783 - bpo-37120: Add SSLContext.num_tickets to control the number of TLSv1.3
16786 - bpo-12202: Fix the error handling in
16789 - bpo-26835: The fcntl module now contains file sealing constants for
16792 - bpo-29262: Add ``get_origin()`` and ``get_args()`` introspection helpers
16795 - bpo-12639: :meth:`msilib.Directory.start_component()` no longer fails if
16796   *keyfile* is not ``None``.
16798 - bpo-36999: Add the ``asyncio.Task.get_coro()`` method to publicly expose
16801 - bpo-35246: Make :func:`asyncio.create_subprocess_exec` accept path-like
16804 - bpo-35279: Change default *max_workers* of ``ThreadPoolExecutor`` from
16808 - bpo-37076: :func:`_thread.start_new_thread` now logs uncaught exception
16813 - bpo-33725: On macOS, the :mod:`multiprocessing` module now uses *spawn*
16816 - bpo-37054: Fix destructor :class:`_pyio.BytesIO` and
16821 - bpo-37058: PEP 544: Add ``Protocol`` and ``@runtime_checkable`` to the
16824 - bpo-36933: The functions ``sys.set_coroutine_wrapper`` and
16828 - bpo-37047: Handle late binding and attribute access in
16832 - bpo-37049: PEP 589: Add ``TypedDict`` to the ``typing`` module.
16834 - bpo-37046: PEP 586: Add ``Literal`` to the ``typing`` module.
16836 - bpo-37045: PEP 591: Add ``Final`` qualifier and ``@final`` decorator to
16839 - bpo-37035: Don't log OSError based exceptions if a fatal error has
16842   propagated to user code, it's just logging them is pointless and pollute
16845 - bpo-37001: :func:`symtable.symtable` now accepts the same input types for
16846   source code as the built-in :func:`compile` function. Patch by Dino
16849 - bpo-37028: Implement asyncio REPL
16851 - bpo-37027: Return safe to use proxy socket object from
16854 - bpo-32528: Make asyncio.CancelledError a BaseException.
16863 - bpo-1230540: Add a new :func:`threading.excepthook` function which handles
16867 - bpo-36996: Handle :func:`unittest.mock.patch` used as a decorator on async
16870 - bpo-37008: Add support for calling :func:`next` with the mock resulting
16873 - bpo-27737: Allow whitespace only header encoding in ``email.header`` - by
16876 - bpo-36969: PDB command `args` now  display positional only arguments.
16879 - bpo-36969: PDB command `args` now  display keyword only arguments. Patch
16882 - bpo-36983: Add missing names to ``typing.__all__``: ``ChainMap``,
16883   ``ForwardRef``, ``OrderedDict`` - by Anthony Sottile.
16885 - bpo-36972: Add SupportsIndex protocol to the typing module to allow type
16889 - bpo-32972: Implement ``unittest.IsolatedAsyncioTestCase`` to help testing
16890   asyncio-based code.
16892 - bpo-36952: :func:`fileinput.input` and :class:`fileinput.FileInput`
16895   been made keyword-only.
16897 - bpo-36952: Starting with Python 3.3, importing ABCs from
16898   :mod:`collections` is deprecated, and import should be done from
16903 - bpo-36949: Implement __repr__ for WeakSet objects.
16905 - bpo-36948: Fix :exc:`NameError` in
16909 - bpo-33524: Fix the folding of email header when the max_line_length is 0
16910   or None and the header contains non-ascii characters.  Contributed by
16911   Licht Takeuchi (@Licht-T).
16913 - bpo-24564: :func:`shutil.copystat` now ignores :const:`errno.EINVAL` on
16919 - bpo-36888: Python child processes can now access the status of their
16922 - bpo-36921: Deprecate ``@coroutine`` for sake of ``async def``.
16924 - bpo-25652: Fix bug in ``__rmod__`` of ``UserString`` - by Batuhan Taskaya.
16926 - bpo-36916: Remove a message about an unhandled exception in a task when
16927   writer.write() is used without await and writer.drain() fails with an
16930 - bpo-36889: Introduce :class:`asyncio.Stream` class that merges
16946 - bpo-36845: Added validation of integer prefixes to the construction of IP
16949 - bpo-23378: Add an extend action to argparser.
16951 - bpo-36867: Fix a bug making a SharedMemoryManager instance and its parent
16954 - bpo-23896: Adds a grammar to lib2to3.pygram that contains exec as a
16957 - bpo-36895: The function ``time.clock()`` was deprecated in 3.3 in favor of
16960 - bpo-35545: Fix asyncio discarding IPv6 scopes when ensuring hostname
16963 - bpo-36887: Add new function :func:`math.isqrt` to compute integer square
16966 - bpo-34632: Introduce the ``importlib.metadata`` module with (provisional)
16967   support for reading metadata from third-party packages.
16969 - bpo-36878: When using `type_comments=True` in `ast.parse`, treat `# type:
16970   ignore` followed by a non-alphanumeric character and then arbitrary text
16972   comment. This is to permit formations such as `# type: ignore[E1000]`.
16974 - bpo-36778: ``cp65001`` encoding (Windows code page 65001) becomes an alias
16977 - bpo-36867: The multiprocessing.resource_tracker replaces the
16981 - bpo-30262: The ``Cache`` and ``Statement`` objects of the :mod:`sqlite3`
16984 - bpo-24538: In `shutil.copystat()`, first copy extended file attributes and
16986   destination while it is still writeable.
16988 - bpo-36829: Add new :func:`sys.unraisablehook` function which can be
16989   overridden to control how "unraisable exceptions" are handled. It is
16990   called when an exception has occurred but there is no way for Python to
16994 - bpo-36832: Introducing ``zipfile.Path``, a pathlib-compatible wrapper for
16997 - bpo-36814: Fix an issue where os.posix_spawnp() would incorrectly raise a
16998   TypeError when file_actions is None.
17000 - bpo-33110: Handle exceptions raised by functions added by
17004 - bpo-26903: Limit `max_workers` in `ProcessPoolExecutor` to 61 to work
17007 - bpo-36813: Fix :class:`~logging.handlers.QueueListener` to call
17010 - bpo-36806: Forbid creation of asyncio stream objects like StreamReader,
17013 - bpo-36802: Provide both sync and async calls for StreamWriter.write() and
17016 - bpo-36801: Properly handle SSL connection closing in asyncio
17019 - bpo-36785: Implement PEP 574 (pickle protocol 5 with out-of-band buffers).
17021 - bpo-36772: functools.lru_cache() can now be used as a straight decorator
17024 - bpo-6584: Add a :exc:`~gzip.BadGzipFile` exception to the :mod:`gzip`
17027 - bpo-36748: Optimized write buffering in C implementation of
17029   latin1, or utf-8 encoding is about 20% faster.  Patch by Inada Naoki.
17031 - bpo-8138: Don't mark ``wsgiref.simple_server.SimpleServer`` as
17032   multi-threaded since ``wsgiref.simple_server.WSGIServer`` is
17033   single-threaded.
17035 - bpo-22640: :func:`py_compile.compile` now supports silent mode. Patch by
17038 - bpo-29183: Fix double exceptions in :class:`wsgiref.handlers.BaseHandler`
17040   when no exception is raised.
17042 - bpo-36548: Improved the repr of regular expression flags.
17044 - bpo-36542: The signature of Python functions can now be overridden by
17047 - bpo-36533: Reinitialize logging.Handler locks in forked child processes
17054 - bpo-35252: Throw a TypeError instead of an AssertionError when using an
17057 - bpo-35900: Allow reduction methods to return a 6-item tuple where the 6th
17058   item specifies a custom state-setting method that's called instead of the
17061 - bpo-35900: enable custom reduction callback registration for functions and
17065 - bpo-36368: Fix a bug crashing SharedMemoryManager instances in interactive
17066   sessions after a ctrl-c (KeyboardInterrupt) was sent
17068 - bpo-31904: Fix mmap fail for VxWorks
17070 - bpo-27497: :meth:`csv.DictWriter.writeheader` now returns the return value
17074 - bpo-36239: Parsing .mo files now ignores comments starting and ending with
17075   #-#-#-#-#.
17077 - bpo-26707: Enable plistlib to read and write binary plist files that were
17081 - bpo-31904: Add posix module support for VxWorks.
17083 - bpo-35125: Asyncio: Remove inner callback on outer cancellation in shield
17085 - bpo-35721: Fix :meth:`asyncio.SelectorEventLoop.subprocess_exec()` leaks
17089 - bpo-31855: :func:`unittest.mock.mock_open` results now respects the
17092 - bpo-35431: Implement :func:`math.comb` that returns binomial coefficient,
17096 - bpo-26660: Fixed permission errors in
17098   ``TemporaryDirectory.cleanup()`` failed when non-writeable or
17099   non-searchable files or directories were created inside a temporary
17102 - bpo-34271: Add debugging helpers to ssl module. It's now possible to dump
17106 - bpo-26467: Added AsyncMock to support using unittest to mock asyncio
17109 - bpo-33569: dataclasses.InitVar: Exposes the type used to create the init
17112 - bpo-34424: Fix serialization of messages containing encoded strings when
17113   the policy.linesep is set to a multi-character string. Patch by Jens
17116 - bpo-34303: Performance of :func:`functools.reduce` is slightly improved.
17119 - bpo-33361: Fix a bug in :class:`codecs.StreamRecoder` where seeking might
17123 - bpo-22454: The :mod:`shlex` module now exposes :func:`shlex.join`, the
17126 - bpo-31922: :meth:`asyncio.AbstractEventLoop.create_datagram_endpoint`: Do
17127   not connect UDP socket when broadcast is allowed. This allows to receive
17130 - bpo-24882: Change ThreadPoolExecutor to use existing idle threads before
17133 - bpo-31961: Added support for bytes and path-like objects in
17135   :term:`path-like object` if *shell* is ``False`` and a sequence containing
17136   bytes and path-like objects. The *executable* parameter now accepts a
17137   bytes and :term:`path-like object`. The *cwd* parameter now accepts a
17140 - bpo-33123: :class:`pathlib.Path.unlink` now accepts a *missing_ok*
17144 - bpo-32941: Allow :class:`mmap.mmap` objects to access the madvise() system
17147 - bpo-22102: Added support for ZIP files with disks set to 0. Such files are
17151 - bpo-32515: trace.py can now run modules via python3 -m trace -t --module
17154 - bpo-32299: Changed :func:`unittest.mock.patch.dict` to return the patched
17157 - bpo-27141: Added a ``__copy__()`` to ``collections.UserList`` and
17161 - bpo-31829: ``\r``, ``\0`` and ``\x1a`` (end-of-file on Windows) are now
17165 - bpo-23395: ``_thread.interrupt_main()`` now avoids setting the Python
17166   error status if the ``SIGINT`` signal is ignored or not handled by Python.
17169 -------------
17171 - bpo-36896: Clarify that some types have unstable constructor signature
17174 - bpo-36686: Improve documentation of the stdin, stdout, and stderr
17176   values are supported. Also mention that decoding as text is not supported.
17181 - bpo-36984: Improve version added references in ``typing`` module - by
17184 - bpo-36868: What's new now mentions SSLContext.hostname_checks_common_name
17187 - bpo-35924: Add a note to the ``curses.addstr()`` documentation to warn
17190 - bpo-36783: Added C API Documentation for Time_FromTimeAndFold and
17194 - bpo-36797: More of the legacy distutils documentation has been either
17198 - bpo-22865: Add detail to the documentation on the `pty.spawn` function.
17200 - bpo-35397: Remove deprecation and document urllib.parse.unwrap(). Patch
17203 - bpo-32995: Added the context variable in glossary.
17205 - bpo-33519: Clarify that `copy()` is not part of the `MutableSequence` ABC.
17207 - bpo-33482: Make `codecs.StreamRecoder.writelines` take a list of bytes.
17209 - bpo-25735: Added documentation for func factorial to indicate that returns
17212 - bpo-20285: Expand object.__doc__ (docstring) to make it clearer. Modify
17217 -----
17219 - bpo-37069: Modify test_coroutines, test_cprofile, test_generators,
17224 - bpo-37098: Fix test_memfd_create on older Linux Kernels.
17226 - bpo-37081: Test with OpenSSL 1.1.1c
17228 - bpo-36829: Add :func:`test.support.catch_unraisable_exception`: context
17231 - bpo-36915: The main regrtest process now always removes all temporary
17235 - bpo-36719: "python3 -m test -jN ..." now continues the execution of next
17237   test suite stopped immediately. Use --failfast to stop at the first error.
17239 - bpo-36816: Update Lib/test/selfsigned_pythontestdotnet.pem to match
17240   self-signed.pythontest.net's new TLS certificate.
17242 - bpo-35925: Skip httplib and nntplib networking tests when they would
17246 - bpo-36782: Add tests for several C API functions in the :mod:`datetime`
17249 - bpo-36342: Fix test_multiprocessing in test_venv if platform lacks
17253 -----
17255 - bpo-36721: To embed Python into an application, a new ``--embed`` option
17256   must be passed to ``python3-config --libs --embed`` to get ``-lpython3.8``
17258   ``python3-config --libs --embed`` first and fallback to ``python3-config
17259   --libs`` (without ``--embed``) if the previous command fails.
17261   Add a pkg-config ``python-3.8-embed`` module to embed Python into an
17262   application: ``pkg-config python-3.8-embed --libs`` includes
17263   ``-lpython3.8``. To support both 3.8 and older, try ``pkg-config
17264   python-X.Y-embed --libs`` first and fallback to ``pkg-config python-X.Y
17265   --libs`` (without ``--embed``) if the previous command fails (replace
17268   On the other hand, ``pkg-config python3.8 --libs`` no longer contains
17269   ``-lpython3.8``. C extensions must not be linked to libpython (except on
17270   Android, case handled by the script); this change is backward incompatible
17273 - bpo-36786: "make install" now runs compileall in parallel.
17276 -------
17278 - bpo-36965: include of STATUS_CONTROL_C_EXIT without depending on MSC
17281 - bpo-35926: Update to OpenSSL 1.1.1b for Windows.
17283 - bpo-29883: Add Windows support for UDP transports for the Proactor Event
17286 - bpo-33407: The :c:macro:`Py_DEPRECATED()` macro has been implemented for
17290 -----
17292 - bpo-36231: Support building Python on macOS without /usr/include
17297 ----
17299 - bpo-35610: Replace now redundant .context_use_ps1 with .prompt_last_line.
17300   This finishes change started in bpo-31858.
17302 - bpo-37038: Make idlelib.run runnable; add test clause.
17304 - bpo-36958: Print any argument other than None or int passed to SystemExit
17307 - bpo-36807: When saving a file, call os.fsync() so bits are flushed to e.g.
17310 - bpo-32411: In browser.py, remove extraneous sorting by line number since
17314 -----------
17316 - bpo-37053: Handle strings like u"bar" correctly in
17317   Tools/parser/unparse.py. Patch by Chih-Hsuan Yen.
17320 -----
17322 - bpo-36763: Implement the :pep:`587` "Python Initialization Configuration".
17324 - bpo-36379: Fix crashes when attempting to use the *modulo* parameter when
17325   ``__ipow__`` is implemented in C.
17327 - bpo-37107: Update :c:func:`PyObject_CallMethodObjArgs` and
17332 - bpo-36974: Implement :pep:`590`: Vectorcall: a fast calling protocol for
17333   CPython. This is a new protocol to optimize calls of custom callable
17336 - bpo-36763: ``Py_Main()`` now returns the exitcode rather than calling
17338   exception type is ``SystemExit``.
17340 - bpo-36922: Add new type flag ``Py_TPFLAGS_METHOD_DESCRIPTOR`` for objects
17345 - bpo-36728: The :c:func:`PyEval_ReInitThreads` function has been removed
17353 *Release date: 2019-05-06*
17356 --------
17358 - bpo-36742: Fixes mishandling of pre-normalization characters in
17361 - bpo-30458: Address CVE-2019-9740 by disallowing URL paths with embedded
17366 - bpo-35755: :func:`shutil.which` now uses ``os.confstr("CS_PATH")`` if
17367   available and if the :envvar:`PATH` environment variable is not set.
17371   variable is not set.
17374 -----------------
17376 - bpo-36722: In debug build, import now also looks for C extensions compiled
17379 - bpo-32849: Fix Python Initialization code on FreeBSD to detect properly
17380   when stdin file descriptor (fd 0) is invalid.
17382 - bpo-36623: Remove parser headers and related function declarations that
17385 - bpo-20180: ``dict.pop()`` is now up to 33% faster thanks to Argument
17388 - bpo-36611: Debug memory allocators: disable serialno field by default from
17391   has been allocated when a fatal memory error is logged to decide where to
17395 - bpo-36588: On AIX, :attr:`sys.platform` doesn't contain the major version
17397   Since older Python versions include the version number, it is recommended
17400 - bpo-36549: Change str.capitalize to use titlecase for the first character
17403 - bpo-36540: Implement :pep:`570` (Python positional-only parameters). Patch
17406 - bpo-36475: :c:func:`PyEval_AcquireLock` and :c:func:`PyEval_AcquireThread`
17407   now terminate the current thread if called while the interpreter is
17411 - bpo-36504: Fix signed integer overflow in _ctypes.c's
17414 - bpo-20844: Fix running script with encoding cookie and LF line ending may
17417 - bpo-24214: Fixed support of the surrogatepass error handler in the UTF-8
17420 - bpo-36452: Changing ``dict`` keys during iteration of the dict itself,
17426 - bpo-36459: Fix a possible double ``PyMem_FREE()`` due to tokenizer.c's
17429 - bpo-36433: Fixed TypeError message in classmethoddescr_call.
17431 - bpo-36430: Fix a possible reference leak in :func:`itertools.count`.
17433 - bpo-36440: Include node names in ``ParserError`` messages, instead of
17436 - bpo-36143: Regenerate :mod:`keyword` from the Grammar and Tokens file
17439 - bpo-18372: Add missing :c:func:`PyObject_GC_Track` calls in the
17443 -------
17445 - bpo-35952: Fix pythoninfo when the compiler is missing.
17447 - bpo-28238: The ``.find*()`` methods of xml.etree.ElementTree can now
17451 - bpo-26978: `pathlib.path.link_to()` is now implemented. It creates a hard
17454 - bpo-1613500: :class:`fileinput.FileInput` now uses the input file mode to
17456   ``'w'``)  when ``inplace=True`` is passed to its constructor.
17458 - bpo-36734: Fix compilation of ``faulthandler.c`` on HP-UX. Initialize
17461 - bpo-13611: The xml.etree.ElementTree packages gained support for C14N 2.0
17464 - bpo-36669: Add missing matrix multiplication operator support to
17467 - bpo-36676: The XMLParser() in xml.etree.ElementTree provides namespace
17471 - bpo-36673: The TreeBuilder and XMLPullParser in xml.etree.ElementTree
17475 - bpo-36650: The C version of functools.lru_cache() was treating calls with
17480 - bpo-28552: Fix :mod:`distutils.sysconfig` if :data:`sys.executable` is
17483   :data:`sys.executable` if it is ``None`` or an empty string.
17485 - bpo-35755: :func:`shutil.which` and
17488   variable is not set. Moreover, don't use ``os.confstr("CS_PATH")`` nor
17489   :data:`os.defpath` if the ``PATH`` environment variable is set to an empty
17492 - bpo-25430: improve performance of ``IPNetwork.__contains__()``
17494 - bpo-30485: Path expressions in xml.etree.ElementTree can now avoid
17498 - bpo-36613: Fix :mod:`asyncio` wait() not removing callback if exception
17500 - bpo-36598: Fix ``isinstance`` check for Mock objects with spec when the
17501   code is executed under tracing. Patch by Karthikeyan Singaravelan.
17503 - bpo-18748: In development mode (:option:`-X` ``dev``) and in debug build,
17507 - bpo-36575: The ``_lsprof`` module now uses internal timer same to
17510   longer impacted by system clock updates since ``perf_counter()`` is
17513 - bpo-33461: ``json.loads`` now emits ``DeprecationWarning`` when
17514   ``encoding`` option is specified.  Patch by Matthias Bussonnier.
17516 - bpo-36559: The random module now prefers the lean internal _sha512 module
17519 - bpo-17561: Set backlog=None as the default for socket.create_server.
17521 - bpo-34373: Fix :func:`time.mktime` error handling on AIX for year before
17524 - bpo-36232: Improve error message when trying to open existing DBM database
17527 - bpo-36546: Add statistics.quantiles()
17529 - bpo-36050: Optimized ``http.client.HTTPResponse.read()`` for large
17532 - bpo-36522: If *debuglevel* is set to >0 in :mod:`http.client`, print all
17536 - bpo-36492: Deprecated passing required arguments like *func* as keyword
17542 - bpo-27181: Add statistics.geometric_mean().
17544 - bpo-30427: ``os.path.normcase()`` relies on ``os.fspath()`` to check the
17549 - bpo-36385: Stop rejecting IPv4 octets for being ambiguously octal. Leading
17554 - bpo-36434: Errors during writing to a ZIP file no longer prevent to
17557 - bpo-36407: Fixed wrong indentation writing for CDATA section in
17560 - bpo-36326: inspect.getdoc() can now find docstrings for member objects
17561   when __slots__ is a dictionary.
17563 - bpo-36366: Calling ``stop()`` on an unstarted or stopped
17568 - bpo-36348: The :meth:`imap.IMAP4.logout` method no longer ignores silently
17571 - bpo-31904: Add time module support and fix test_time faiures for VxWorks.
17573 - bpo-36227: Added support for keyword arguments `default_namespace` and
17577 - bpo-36004: Added new alternate constructors
17583 - bpo-35936: :mod:`modulefinder` no longer depends on the deprecated
17588 - bpo-35376: :mod:`modulefinder` correctly handles modules that have the
17591 - bpo-17396: :mod:`modulefinder` no longer crashes when encountering syntax
17594 - bpo-35934: Added :meth:`~socket.create_server()` and
17597   accepting both IPv4 and IPv6 connections on the same socket.  (Contributed
17600 - bpo-23078: Add support for :func:`classmethod` and :func:`staticmethod` to
17603 - bpo-35416: Fix potential resource warnings in distutils. Patch by Mickaël
17606 - bpo-25451: Add transparency methods to :class:`tkinter.PhotoImage`.  Patch
17609 - bpo-35082: Don't return deleted attributes when calling dir on a
17612 - bpo-34547: :class:`wsgiref.handlers.BaseHandler` now handles abrupt client
17615 - bpo-31658: :func:`xml.sax.parse` now supports :term:`path-like <path-like
17618 - bpo-34139: Remove stale unix datagram socket before binding
17620 - bpo-33530: Implemented Happy Eyeballs in `asyncio.create_connection()`.
17624 - bpo-33291: Do not raise AttributeError when calling the inspect functions
17628 - bpo-31310: Fix the multiprocessing.semaphore_tracker so it is reused by
17631 - bpo-31292: Fix ``setup.py check --restructuredtext`` for files containing
17635 -------------
17637 - bpo-36625: Remove obsolete comments from docstrings in fractions.Fraction
17639 - bpo-30840: Document relative imports
17641 - bpo-36523: Add docstring for io.IOBase.writelines().
17643 - bpo-36425: New documentation translation: `Simplified Chinese
17644   <https://docs.python.org/zh-cn/>`_.
17646 - bpo-36345: Avoid the duplication of code from ``Tools/scripts/serve.py``
17648   wsgiref-based web server in the documentation of :mod:`wsgiref`.
17651 - bpo-36345: Using the code of the ``Tools/scripts/serve.py`` script as an
17655 - bpo-36157: Added Documention for  PyInterpreterState_Main().
17657 - bpo-33043: Updates the docs.python.org page with the addition of a
17662 - bpo-35581: @typing.type_check_only now allows type stubs to mark functions
17665 - bpo-33832: Add glossary entry for 'magic method'.
17667 - bpo-32913: Added re.Match.groupdict example to regex HOWTO.
17670 -----
17672 - bpo-36719: regrtest now always detects uncollectable objects. Previously,
17673   the check was only enabled by ``--findleaks``. The check now also works
17674   with ``-jN/--multiprocess N``. ``--findleaks`` becomes a deprecated alias
17675   to ``--fail-env-changed``.
17677 - bpo-36725: When using multiprocessing mode (-jN), regrtest now better
17681 - bpo-36454: Change test_time.test_monotonic() to test only the lower bound
17686 - bpo-32424: Improve test coverage for xml.etree.ElementTree. Patch by
17689 - bpo-32424: Fix typo in test_cyclic_gc() test for xml.etree.ElementTree.
17692 - bpo-36635: Add a new :mod:`_testinternalcapi` module to test the internal
17695 - bpo-36629: Fix ``test_imap4_host_default_value()`` of ``test_imaplib``:
17698 - bpo-36611: Fix ``test_sys.test_getallocatedblocks()`` when
17699   :mod:`tracemalloc` is enabled.
17701 - bpo-36560: Fix reference leak hunting in regrtest: compute also deltas (of
17703   warmup, to ensure that everything is initialized before starting to hunt
17706 - bpo-36565: Fix reference hunting (``python3 -m test -R 3:3``) when Python
17707   has no built-in abc module.
17709 - bpo-31904: Port test_resource to VxWorks: skip tests cases setting
17712 - bpo-31904: Fix test_tabnanny on VxWorks: adjust ENOENT error message.
17714 - bpo-36436: Fix ``_testcapi.pymem_buffer_overflow()``: handle memory
17717 - bpo-31904: Fix test_utf8_mode on VxWorks: Python always use UTF-8 on
17720 - bpo-36341: Fix tests that may fail with PermissionError upon calling
17724 -----
17726 - bpo-36747: Remove the stale scriptsinstall Makefile target.
17728 - bpo-21536: On Unix, C extensions are no longer linked to libpython except
17731   It is now possible for a statically linked Python to load a C extension
17734   When Python is embedded, ``libpython`` must not be loaded with
17740   distutils, python-config and python-config.py have been modified.
17742 - bpo-36707: ``./configure --with-pymalloc`` no longer adds the ``m`` flag
17746 - bpo-36635: Change ``PyAPI_FUNC(type)``, ``PyAPI_DATA(type)`` and
17747   ``PyMODINIT_FUNC`` macros of ``pyport.h`` when ``Py_BUILD_CORE_MODULE`` is
17752 - bpo-31904: Don't build the ``_crypt`` extension on VxWorks.
17754 - bpo-36618: Add ``-fmax-type-align=8`` to CFLAGS when clang compiler is
17756   x86-64, clang expects alignment on 16 bytes by default and so uses MOVAPS
17758   Python is limited to alignment on 8 bytes to use MOVUPS instruction
17759   instead: slower but don't trigger a SIGSEGV if the memory is not aligned
17763 - bpo-36605: ``make tags`` and ``make TAGS`` now also parse
17766 - bpo-36465: Release builds and debug builds are now ABI compatible:
17771   the new ``./configure --with-trace-refs`` build option.
17773 - bpo-36577: setup.py now correctly reports missing OpenSSL headers and
17776 - bpo-36544: Fix regression introduced in bpo-36146 refactoring setup.py
17778 - bpo-36508: ``python-config --ldflags`` no longer includes flags of the
17782 - bpo-36503: Remove references to "aix3" and "aix4". Patch by M. Felt.
17785 -------
17787 - bpo-35920: Added platform.win32_edition() and platform.win32_is_iot().
17788   Added support for cross-compiling packages for Windows ARM32. Skip tests
17791 - bpo-36649: Remove trailing spaces for registry keys when installed via the
17794 - bpo-34144: Fixed activate.bat to correctly update codepage when chcp.com
17797 - bpo-36509: Added preset-iot layout for Windows IoT ARM containers. This
17799   contain files to support on-target builds since Windows ARM32 builds must
17800   be cross-compiled when using MSVC.
17802 - bpo-35941: enum_certificates function of the ssl module now returns
17808   ssl.enum_crls() function is changed in the same way to return all
17812 - bpo-36441: Fixes creating a venv when debug binaries are installed.
17814 - bpo-36085: Enable better DLL resolution on Windows by using safe DLL
17817 - bpo-36010: Add the venv standard library module to the nuget distribution
17820 - bpo-29515: Add the following socket module constants on Windows:
17828 - bpo-35947: Added current version of libffi to cpython-source-deps. Change
17831 - bpo-34060: Report system load when running test suite on Windows. Patch by
17834 - bpo-31512: With the Windows 10 Creators Update, non-elevated users can now
17838 -----
17840 - bpo-34602: Avoid failures setting macOS stack resource limit with
17841   resource.setrlimit. This reverts an earlier fix for bpo-18075 which forced
17842   a non-default stack size when building the interpreter executable on
17846 ----
17848 - bpo-36429: Fix starting IDLE with pyshell. Add idlelib.pyshell alias at
17853 -----------
17855 - bpo-14546: Fix the argument handling in Tools/scripts/lll.py.
17858 -----
17860 - bpo-36763: Fix memory leak in :c:func:`Py_SetStandardStreamEncoding`:
17861   release memory if the function is called twice.
17863 - bpo-36641: :c:expr:`PyDoc_VAR(name)` and :c:expr:`PyDoc_STRVAR(name,str)`
17867 - bpo-36389: Change the value of ``CLEANBYTE``, ``DEADDYTE`` and
17874 - bpo-36443: Since Python 3.7.0, calling :c:func:`Py_DecodeLocale` before
17875   :c:func:`Py_Initialize` produces mojibake if the ``LC_CTYPE`` locale is
17876   coerced and/or if the UTF-8 Mode is enabled by the user configuration. The
17877   LC_CTYPE coercion and UTF-8 Mode are now disabled by default to fix the
17878   mojibake issue. They must now be enabled explicitly (opt-in) using the new
17881 - bpo-36025: Fixed an accidental change to the datetime C API where the
17885   backwards-incompatible change was only present in alpha releases of Python
17888 - bpo-35810: Modify ``PyObject_Init`` to correctly increase the refcount of
17889   heap- allocated Type objects. Also fix the refcounts of the heap-allocated
17897 *Release date: 2019-03-25*
17900 --------
17902 - bpo-36216: Changes urlsplit() to raise ValueError when the URL contains
17903   characters that decompose under IDNA encoding (NFKC-normalization) into
17904   characters that affect how the URL is parsed.
17906 - bpo-35121: Don't send cookies of domain A without Domain attribute to
17907   domain B when domain A is a suffix match of domain B while using a
17912 -----------------
17914 - bpo-36421: Fix a possible double decref in _ctypes.c's
17917 - bpo-36412: Fix a possible crash when creating a new dictionary.
17919 - bpo-36398: Fix a possible crash in ``structseq_repr()``.
17921 - bpo-36256: Fix bug in parsermodule when parsing a state in a DFA that has
17924 - bpo-36365: repr(structseq) is no longer limited to 512 bytes.
17926 - bpo-36374: Fix a possible null pointer dereference in
17929 - bpo-36236: At Python initialization, the current directory is no longer
17932 - bpo-36352: Python initialization now fails with an error, rather than
17933   silently truncating paths, if a path is too long.
17935 - bpo-36301: Python initialization now fails if decoding ``pybuilddir.txt``
17938 - bpo-36333: Fix leak in _PyRuntimeState_Fini. Contributed by Stéphane
17941 - bpo-36332: The builtin :func:`compile` can now handle AST objects that
17944 - bpo-36282: Improved error message for too much positional arguments in
17947 - bpo-30040: New empty dict uses fewer memory for now.  It used more memory
17949   deletion is about 2x faster.  Patch by Inada Naoki.
17951 - bpo-36262: Fix an unlikely memory leak on conversion from string to float
17955 - bpo-36252: Update Unicode databases to version 12.0.0.
17957 - bpo-36218: Fix a segfault occurring when sorting a list of heterogeneous
17960 - bpo-36188: Cleaned up left-over vestiges of Python 2 unbound method
17963 - bpo-36124: Add a new interpreter-specific dict and expose it in the C-API
17966   their own internal per-interpreter state.
17968 - bpo-35975: Add a ``feature_version`` flag to ``ast.parse()`` (documented)
17970   older versions of the grammar. In particular, if ``feature_version`` is 5
17976 - bpo-31904: Use UTF-8 as the system encoding on VxWorks.
17978 - bpo-36048: The :meth:`~object.__index__` special method will be used
17983 - bpo-35808: Retire pgen and use a modified version of pgen2 to generate the
17987 -------
17989 - bpo-36401: The class documentation created by pydoc now has a separate
17992 - bpo-36320: The typing.NamedTuple() class has deprecated the _field_types
17997 - bpo-34745: Fix :mod:`asyncio` ssl memory issues caused by circular
18000 - bpo-36324: Add method to statistics.NormalDist for computing the inverse
18003 - bpo-36321: collections.namedtuple() misspelled the name of an attribute.
18009 - bpo-36297: "unicode_internal" codec is removed.  It was deprecated since
18012 - bpo-36298: Raise ModuleNotFoundError in pyclbr when a module can't be
18015 - bpo-36268: Switch the default format used for writing tars with
18016   mod:`tarfile` to the modern POSIX.1-2001 pax standard, from the
18017   vendor-specific GNU. Contributed by C.A.M. Gerlach.
18019 - bpo-36285: Fix integer overflows in the array module. Patch by Stephan
18022 - bpo-31904: Add _signal module support for VxWorks.
18024 - bpo-36272: :mod:`logging` does not silently ignore RecursionError anymore.
18027 - bpo-36280: Add a kind field to ast.Constant. It is 'u' if the literal has
18030 - bpo-35931: The :mod:`pdb` ``debug`` command now gracefully handles all
18033 - bpo-36251: Fix format strings used for stderrprinter and re.Match reprs.
18036 - bpo-36235: Fix ``CFLAGS`` in ``customize_compiler()`` of
18037   ``distutils.sysconfig``: when the ``CFLAGS`` environment variable is
18041 - bpo-35807: Update ensurepip to install pip 19.0.3 and setuptools 40.8.0.
18043 - bpo-36139: Release GIL when closing :class:`~mmap.mmap` objects.
18045 - bpo-36179: Fix two unlikely reference leaks in _hashopenssl. The leaks
18046   only occur in out-of-memory cases.
18048 - bpo-36169: Add overlap() method to statistics.NormalDist.  Computes the
18051 - bpo-36103: Default buffer size used by ``shutil.copyfileobj()`` is changed
18052   from 16 KiB to 64 KiB on non-Windows platform to reduce system call
18055 - bpo-36130: Fix ``pdb`` with ``skip=...`` when stepping into a frame
18058 - bpo-35652: shutil.copytree(copy_function=...) erroneously pass DirEntry
18061 - bpo-35178: Ensure custom :func:`warnings.formatwarning` function can
18064 - bpo-36106: Resolve potential name clash with libm's sinpi(). Patch by
18067 - bpo-36091: Clean up reference to async generator in Lib/types. Patch by
18070 - bpo-36043: :class:`FileCookieJar` supports :term:`path-like object`.
18073 - bpo-35899: Enum has been fixed to correctly handle empty strings and
18074   strings with non-Latin characters (ie. 'α', 'א') without crashing.
18077 - bpo-21269: Add ``args`` and ``kwargs`` properties to mock call objects.
18080 - bpo-30670: `pprint.pp` has been added to pretty-print objects with
18085 - bpo-35843: Implement ``__getitem__`` for ``_NamespacePath``.  Patch by
18088 - bpo-35802: Clean up code which checked presence of ``os.stat`` /
18092 - bpo-35715: Librates the return value of a ProcessPoolExecutor
18095 - bpo-35493: Use :func:`multiprocessing.connection.wait` instead of polling
18099 - bpo-35661: Store the venv prompt in pyvenv.cfg.
18101 - bpo-35121: Don't set cookie for a request when the request path is a
18105 - bpo-21478: Calls to a child function created with
18109 - bpo-35198: Fix C++ extension compilation on AIX
18112 -------------
18114 - bpo-36329: Declare the path of the Python binary for the usage of
18115   ``Tools/scripts/serve.py`` when executing ``make -C Doc/ serve``.
18118 - bpo-36138: Improve documentation about converting datetime.timedelta to
18121 - bpo-21314: A new entry was added to the Core Language Section of the
18126 -----
18128 - bpo-36234: test_posix.PosixUidGidTests: add tests for invalid uid/gid type
18131 - bpo-29571: Fix ``test_re.test_locale_flag()``:  use
18136 - bpo-36123: Fix race condition in test_socket.
18139 -----
18141 - bpo-36356: Fix leaks that led to build failure when configured with
18144 - bpo-36146: Add ``TEST_EXTENSIONS`` constant to ``setup.py`` to allow to
18147 - bpo-36146: Fix setup.py on macOS: only add ``/usr/include/ffi`` to include
18150 - bpo-31904: Enable build system to cross-build for VxWorks RTOS.
18153 -------
18155 - bpo-36312: Fixed decoders for the following code pages: 50220, 50221,
18158 - bpo-36264: Don't honor POSIX ``HOME`` in ``os.path.expanduser`` on
18161 - bpo-24643: Fix name collisions due to ``#define timezone _timezone`` in
18165 ----
18167 - bpo-36405: Use dict unpacking in idlelib.
18169 - bpo-36396: Remove fgBg param of idlelib.config.GetHighlight(). This param
18172 - bpo-36176: Fix IDLE autocomplete & calltip popup colors. Prevent conflicts
18175 - bpo-23205: For the grep module, add tests for findfiles, refactor
18176   findfiles to be a module-level function, and refactor findfiles to use
18179 - bpo-23216: Add docstrings to IDLE search modules.
18181 - bpo-36152: Remove colorizer.ColorDelegator.close_when_done and the
18185 - bpo-32129: Avoid blurry IDLE application icon on macOS with Tk 8.6. Patch
18188 - bpo-36096: Refactor class variables to instance variables in colorizer.
18190 - bpo-30348: Increase test coverage of idlelib.autocomplete by 30%. Patch by
18194 -----------
18196 - bpo-35132: Fix py-list and py-bt commands of python-gdb.py on gdb7.
18198 - bpo-32217: Fix freeze script on Windows.
18201 -----
18203 - bpo-36381: Raise ``DeprecationWarning`` when '#' formats are used for
18206 - bpo-36142: The whole coreconfig.h header is now excluded from
18214 *Release date: 2019-02-25*
18217 -----------------
18219 - bpo-36052: Raise a :exc:`SyntaxError` when assigning a value to
18223 - bpo-36012: Doubled the speed of class variable writes.  When a non-dunder
18226 - bpo-35942: The error message emitted when returning invalid types from
18230 - bpo-36016: ``gc.get_objects`` can now receive an optional parameter
18233 - bpo-1054041: When the main interpreter exits due to an uncaught
18239 - bpo-35992: Fix ``__class_getitem__()`` not being called on a class with a
18240   custom non-subscriptable metaclass.
18242 - bpo-35993: Fix a crash on fork when using subinterpreters. Contributed by
18245 - bpo-35991: Fix a potential double free in Modules/_randommodule.c.
18247 - bpo-35961: Fix a crash in slice_richcompare(): use strong references
18250 - bpo-35911: Enable the creation of cell objects by adding a
18254 - bpo-12822: Use monotonic clock for ``pthread_cond_timedwait`` when
18257 - bpo-15248: The compiler emits now syntax warnings in the case when a comma
18258   is likely missed before tuple or list.
18260 - bpo-35886: The implementation of PyInterpreterState has been moved into
18263 - bpo-31506: Clarify the errors reported when ``object.__new__`` and
18267 - bpo-35724: Signal-handling is now guaranteed to happen relative to the
18270 - bpo-33608: We added a new internal _Py_AddPendingCall() that operates
18277 - bpo-33989: Fix a possible crash in :meth:`list.sort` when sorting objects
18278   with ``ob_type->tp_richcompare == NULL``.  Patch by Zackery Spytz.
18281 -------
18283 - bpo-35512: :func:`unittest.mock.patch.dict` used as a decorator with
18287 - bpo-36018: Add statistics.NormalDist, a tool for creating and manipulating
18292 - bpo-35904: Added statistics.fmean() as a faster, floating point variant of
18295 - bpo-35918: Removed broken ``has_key`` method from
18298 - bpo-18283: Add support for bytes to :func:`shutil.which`.
18300 - bpo-35960: Fix :func:`dataclasses.field` throwing away empty mapping
18303 - bpo-35500: Write expected and actual call parameters on separate lines in
18307 - bpo-35931: The :mod:`pdb` ``debug`` command now gracefully handles syntax
18310 - bpo-24209: In http.server script, rely on getaddrinfo to bind to preferred
18312   may bind to IPv6 or dual-stack, depending on the environment.
18314 - bpo-35321: Set ``__spec__.origin`` of  ``_frozen_importlib`` to frozen so
18318 - bpo-35378: Fix a reference issue inside :class:`multiprocessing.Pool` that
18320   terminated explicitly. A new strong reference is added to the pool
18322   iterators so the pool does not get destroyed if a pool iterator is still
18325 - bpo-34294: re module, fix wrong capturing groups in rare cases.
18330 - bpo-35615: :mod:`weakref`: Fix a RuntimeError when copying a
18334 - bpo-35606: Implement :func:`math.prod` as analogous function to
18338 - bpo-32417: Performing arithmetic between :class:`datetime.datetime`
18345 - bpo-35153: Add *headers* optional keyword-only parameter to
18349 - bpo-34572: Fix C implementation of pickle.loads to use importlib's locking
18354 -------------
18356 - bpo-36083: Fix formatting of --check-hash-based-pycs options in the
18359 - bpo-36007: Bump minimum sphinx version to 1.8.  Patch by Anthony Sottile.
18361 - bpo-22062: Update documentation and docstrings for pathlib. Original patch
18365 -----
18367 - bpo-27313: Avoid test_ttk_guionly ComboboxTest failure with macOS Cocoa
18370 - bpo-36019: Add test.support.TEST_HTTP_URL and replace references of
18374 - bpo-36037: Fix test_ssl for strict OpenSSL configuration like RHEL8 strict
18379 - bpo-35798: Added :func:`test.support.check_syntax_warning`.
18381 - bpo-35505: Make test_imap4_host_default_value independent on whether the
18382   local IMAP server is running.
18384 - bpo-35917: multiprocessing: provide unit tests for SyncManager and
18388 - bpo-35704: Skip ``test_shutil.test_unpack_archive_xztar`` to prevent a
18389   MemoryError on 32-bit AIX when MAXDATA setting is less than 0x20000000.
18393 - bpo-34720: Assert m_state != NULL to mimic GC traversal functions that do
18398 -------
18400 - bpo-35976: Added ARM build support to Windows build files in PCBuild.
18402 - bpo-35692: ``pathlib`` no longer raises when checking file and directory
18405 - bpo-35872: Uses the base Python executable when invoking venv in a virtual
18408 - bpo-35873: Prevents venv paths being inherited by child processes
18410 - bpo-35299: Fix sysconfig detection of the source directory and distutils
18414 ----
18416 - bpo-24310: IDLE -- Document settings dialog font tab sample.
18418 - bpo-35833: Revise IDLE doc for control codes sent to Shell. Add a code
18421 - bpo-35689: Add docstrings and unittests for colorizer.py.
18427 *Release date: 2019-02-03*
18430 --------
18432 - bpo-35746: [CVE-2019-5010] Fix a NULL pointer deref in ssl module. The
18435   Vulnerability (TALOS-2018-0758) reported by Colin Read and Nicolas Edet of
18438 - bpo-34812: The :option:`-I` command line option (run Python in isolated
18439   mode) is now also copied by the :mod:`multiprocessing` and
18441   :option:`-E` and :option:`-s` options (enabled by :option:`-I`) were
18444 - bpo-34791: The xml.sax and xml.dom.domreg no longer use environment
18446   sys.flags.ignore_environment is set by -E or -I arguments.
18448 - bpo-17239: The xml.sax and xml.dom.minidom parsers no longer processes
18452 - bpo-34623: CVE-2018-14647: The C accelerated _elementtree module now
18456 - bpo-34405: Updated to OpenSSL 1.1.0i for Windows builds.
18458 - bpo-33871: Fixed sending the part of the file in :func:`os.sendfile` on
18462 - bpo-32533: Fixed thread-safety of error handling in _ssl.
18464 - bpo-33136: Harden ssl module against LibreSSL CVE-2018-8970.
18465   X509_VERIFY_PARAM_set1_host() is called with an explicit namelen. A new
18468 - bpo-33001: Minimal fix to prevent buffer overrun in os.symlink on Windows
18470 - bpo-32981: Regexes in difflib and poplib were vulnerable to catastrophic
18472   have been refactored. This resolves CVE-2018-1060 and CVE-2018-1061. Patch
18475 - bpo-28414: The ssl module now allows users to perform their own IDN
18479 -----------------
18481 - bpo-35877: Make parenthesis optional for named expressions in while
18484 - bpo-35814: Allow same right hand side expressions in annotated assignments
18486   parentheses on the right) is now allowed.
18488 - bpo-35766: Add the option to parse PEP 484 type comments in the ast
18489   module. (Off by default.) This is merging the key functionality of the
18493 - bpo-35713: Reorganize Python initialization to get working exceptions and
18496 - bpo-33416: Add end line and end column position information to the Python
18497   AST nodes. This is a C-level backwards incompatible change.
18499 - bpo-35720: Fixed a minor memory leak in pymain_parse_cmdline_impl function
18502 - bpo-35634: ``func(**kwargs)`` will now raise an error when ``kwargs`` is a
18507 - bpo-35623: Fix a crash when sorting very long lists. Patch by Stephan
18510 - bpo-35214: clang Memory Sanitizer build instrumentation was added to work
18514 - bpo-35560: Fix an assertion error in :func:`format` in debug build for
18516   Release build is not impacted. Patch by Karthikeyan Singaravelan.
18518 - bpo-35552: Format characters ``%s`` and ``%V`` in
18520   no longer read memory past the limit if *precision* is specified.
18522 - bpo-35504: Fix segfaults and :exc:`SystemError`\ s when deleting certain
18525 - bpo-35504: Fixed a SystemError when delete the characters_written
18528 - bpo-35494: Improved syntax error messages for unbalanced parentheses in
18529   f-string.
18531 - bpo-35444: Fixed error handling in pickling methods when fail to look up
18534 - bpo-35436: Fix various issues with memory allocation error handling.
18537 - bpo-35423: Separate the signal handling trigger in the eval loop from the
18538   "pending calls" machinery. There is no semantic change and the difference
18539   in performance is insignificant.
18541 - bpo-35357: Internal attributes' names of unittest.mock._Call and
18546 - bpo-35372: Fixed the code page decoder for input longer than 2 GiB
18549 - bpo-35336: Fix PYTHONCOERCECLOCALE=1 environment variable: only coerce the
18550   C locale if the LC_CTYPE locale is "C".
18552 - bpo-31241: The *lineno* and *col_offset* attributes of AST nodes for list
18557 - bpo-33954: For :meth:`str.format`, :meth:`float.__format__` and
18558   :meth:`complex.__format__` methods for non-ASCII decimal point when using
18561 - bpo-35269: Fix a possible segfault involving a newly created coroutine.
18564 - bpo-35224: Implement :pep:`572` (assignment expressions). Patch by Emily
18567 - bpo-32492: Speed up :class:`namedtuple` attribute access by 1.6x using a C
18568   fast-path for the name descriptors. Patch by Pablo Galindo.
18570 - bpo-35214: Fixed an out of bounds memory access when parsing a truncated
18574 - bpo-35214: The interpreter and extension modules have had annotations
18576   configure flag --with-memory-sanitizer has been added to make test builds
18579 - bpo-35193: Fix an off by one error in the bytecode peephole optimizer
18584 - bpo-35169: Improved error messages for forbidden assignments.
18586 - bpo-34022: Fix handling of hash-based bytecode files in :mod:`zipimport`.
18589 - bpo-28401: Debug builds will no longer to attempt to import extension
18593 - bpo-29341: Clarify in the docstrings of :mod:`os` methods that path-like
18596 - bpo-35050: :mod:`socket`: Fix off-by-one bug in length check for
18599 - bpo-29743: Raise :exc:`ValueError` instead of :exc:`OverflowError` in case
18601   raise :exc:`TypeError` instead of :exc:`AttributeError` for non-integer
18604 - bpo-16806: Fix ``lineno`` and ``col_offset`` for multi-line string tokens.
18606 - bpo-35029: :exc:`SyntaxWarning` raised as an exception at code generation
18610 - bpo-34983: Expose :meth:`symtable.Symbol.is_nonlocal` in the symtable
18613 - bpo-34974: :class:`bytes` and :class:`bytearray` constructors no longer
18617 - bpo-34939: Allow annotated names in module namespace that are declared
18620 - bpo-34973: Fixed crash in :func:`bytes` when the :class:`list` argument is
18621   mutated while it is iterated.
18623 - bpo-34876: The *lineno* and *col_offset* attributes of the AST for
18627   tracing. This is the only case when the position of child AST nodes can
18630 - bpo-34879: Fix a possible null pointer dereference in bytesobject.c.
18633 - bpo-34784: Fix the implementation of PyStructSequence_NewType in order to
18636 - bpo-32912: A :exc:`SyntaxWarning` is now emitted instead of a
18640 - bpo-34854: Fixed a crash in compiling string annotations containing a
18641   lambda with a keyword-only argument that doesn't have a default value.
18643 - bpo-34850: The compiler now produces a :exc:`SyntaxWarning` when identity
18644   checks (``is`` and ``is not``) are used with certain types of literals
18646   are not guaranteed by the language spec.  The warning advises users to use
18649 - bpo-34824: Fix a possible null pointer dereference in Modules/_ssl.c.
18652 - bpo-30156: The C function ``property_descr_get()`` uses a "cached" tuple
18657 - bpo-34762: Fix contextvars C API to use PyObject* pointer types.
18659 - bpo-34751: The hash function for tuples is now based on xxHash which gives
18661   on 64-bit systems it improves tuple hashes in general. Patch by Jeroen
18664 - bpo-34735: Fix a memory leak in Modules/timemodule.c.  Patch by Zackery
18667 - bpo-34683: Fixed a bug where some SyntaxError error pointed to locations
18668   that were off-by-one.
18670 - bpo-34651: Only allow the main interpreter to fork.  The avoids the
18671   possibility of affecting the main interpreter, which is critical to
18674 - bpo-34653: Remove unused function PyParser_SimpleParseStringFilename.
18676 - bpo-32236: Warn that line buffering is not supported if :func:`open` is
18679 - bpo-34641: Further restrict the syntax of the left-hand side of keyword
18680   arguments in function calls. In particular, ``f((keyword)=arg)`` is now
18683 - bpo-34637: Make the *start* argument to *sum()* visible as a keyword
18686 - bpo-1621: Do not assume signed integer overflow behavior (C undefined
18689 - bpo-34588: Fix an off-by-one in the recursive call pruning feature of
18692 - bpo-34485: On Windows, the LC_CTYPE is now set to the user preferred
18696 - bpo-34485: Standard streams like sys.stdout now use the "surrogateescape"
18698   is not coerced and the UTF-8 Mode is disabled).
18700 - bpo-34485: Fix the error handler of standard streams like sys.stdout:
18701   PYTHONIOENCODING=":" is now ignored instead of setting the error handler
18704 - bpo-34485: Python now gets the locale encoding with C code to initialize
18706   is now initialized to the Python codec name to get a normalized encoding
18707   name and to ensure that the codec is loaded. The change avoids importing
18710 - bpo-34527: On FreeBSD, Py_DecodeLocale() and Py_EncodeLocale() now also
18711   forces the ASCII encoding if the LC_CTYPE locale is "POSIX", not only if
18712   the LC_CTYPE locale is "C".
18714 - bpo-34527: The UTF-8 Mode is now also enabled by the "POSIX" locale, not
18717 - bpo-34403: On HP-UX with C or POSIX locale, sys.getfilesystemencoding()
18718   now returns "ascii" instead of "roman8" (when the UTF-8 Mode is disabled
18719   and the C locale is not coerced).
18721 - bpo-34523: The Python filesystem encoding is now read earlier during the
18724 - bpo-12458: Tracebacks show now correct line number for subexpressions in
18729 - bpo-34408: Prevent a null pointer dereference and resource leakage in
18732 - bpo-34400: Fix undefined behavior in parsetok.c.  Patch by Zackery Spytz.
18734 - bpo-33073: Added as_integer_ratio to ints to make them more interoperable
18737 - bpo-34377: Update valgrind suppression list to use
18741 - bpo-34353: Added the "socket" option in the `stat.filemode()` Python
18744 - bpo-34320: Fix ``dict(od)`` didn't copy iteration order of OrderedDict.
18746 - bpo-34113: Fixed crash on debug builds when opcode stack was adjusted with
18749 - bpo-34100: Compiler now merges constants in tuples and frozensets
18752 - bpo-34151: Performance of list concatenation, repetition and slicing
18753   operations is slightly improved. Patch by Sergey Fedoseev.
18755 - bpo-34170: -X dev: it is now possible to override the memory allocator
18756   using PYTHONMALLOC even if the developer mode is enabled.
18758 - bpo-33237: Improved :exc:`AttributeError` message for partially
18761 - bpo-34149: Fix min and max functions to get default behavior when key is
18764 - bpo-34125: Profiling of unbound built-in methods now works when
18765   ``**kwargs`` is given.
18767 - bpo-34141: Optimized pickling atomic types (None, bool, int, float, bytes,
18770 - bpo-34126: Fix crashes when profiling certain invalid calls of unbound
18773 - bpo-24618: Fixed reading invalid memory when create the code object with
18776 - bpo-34068: In :meth:`io.IOBase.close`, ensure that the
18777   :attr:`~io.IOBase.closed` attribute is not set with a live exception.
18780 - bpo-34087: Fix buffer overflow while converting unicode to numeric values.
18782 - bpo-34080: Fixed a memory leak in the compiler when it raised some
18785 - bpo-34066: Disabled interruption by Ctrl-C between calling ``open()`` and
18788 - bpo-34042: Fix dict.copy() to maintain correct total refcount (as reported
18791 - bpo-33418: Fix potential memory leak in function object when it creates
18794 - bpo-33985: Implement contextvars.ContextVar.name attribute.
18796 - bpo-33956: Update vendored Expat library copy to version 2.2.5.
18798 - bpo-24596: Decref the module object in :c:func:`PyRun_SimpleFileExFlags`
18801 - bpo-33451: Close directly executed pyc files before calling
18804 - bpo-1617161: The hash of :class:`BuiltinMethodType` instances (methods of
18805   built-in classes) now depends on the hash of the identity of *__self__*
18807   :class:`MethodWrapperType` instances (methods of user-defined classes and
18808   some methods of built-in classes like ``str.__add__``) now depend on the
18812 - bpo-33824: Fix "LC_ALL=C python3.7 -V": reset properly the command line
18815 - bpo-33803: Fix a crash in hamt.c caused by enabling GC tracking for an
18818 - bpo-33738: Seven macro incompatibilities with the Limited API were fixed,
18823 - bpo-33786: Fix asynchronous generators to handle GeneratorExit in athrow()
18826 - bpo-30167: ``PyRun_SimpleFileExFlags`` removes ``__cached__`` from module
18829 - bpo-33706: Fix a crash in Python initialization when parsing the command
18832 - bpo-33597: Reduce ``PyGC_Head`` size from 3 words to 2 words.
18834 - bpo-30654: Fixed reset of the SIGINT handler to SIG_DFL on interpreter
18838 - bpo-33622: Fixed a leak when the garbage collector fails to add an object
18841   exception is set and preserves it.
18843 - bpo-33462: Make dict and dict views reversible. Patch by Rémi Lapeyre.
18845 - bpo-23722: A :exc:`RuntimeError` is now raised when the custom metaclass
18848   3.6--3.7.
18850 - bpo-33499: Add :envvar:`PYTHONPYCACHEPREFIX` environment variable and
18851   :option:`-X` ``pycache_prefix`` command-line option to set an alternate
18854 - bpo-25711: The :mod:`zipimport` module has been rewritten in pure Python.
18856 - bpo-33509: Fix module_globals parameter of warnings.warn_explicit(): don't
18857   crash if module_globals is not a dict.
18859 - bpo-31849: Fix signed/unsigned comparison warning in pyhash.c.
18861 - bpo-33475: Fixed miscellaneous bugs in converting annotations to strings
18864 - bpo-20104: Added support for the `setpgroup`, `resetids`, `setsigmask`,
18868 - bpo-33391: Fix a leak in set_symmetric_difference().
18870 - bpo-33363: Raise a SyntaxError for ``async with`` and ``async for``
18873 - bpo-28055: Fix unaligned accesses in siphash24(). Patch by Rolf Eike Beer.
18875 - bpo-33128: Fix a bug that causes PathFinder to appear twice on
18878 - bpo-33331: Modules imported last are now cleared first at interpreter
18881 - bpo-33312: Fixed clang ubsan (undefined behavior sanitizer) warnings in
18883   keys structure is declared.
18885 - bpo-33305: Improved syntax error messages for invalid numerical literals.
18887 - bpo-33306: Improved syntax error messages for unbalanced parentheses.
18889 - bpo-33234: The list constructor will pre-size and not over-allocate when
18890   the input length is known.
18892 - bpo-33270: Intern the names for all anonymous code objects.  Patch by
18895 - bpo-30455: The C and Python code and the documentation related to tokens
18898 - bpo-33176: Add a ``toreadonly()`` method to memoryviews.
18900 - bpo-33231: Fix potential memory leak in ``normalizestring()``.
18902 - bpo-33205: Change dict growth function from
18904   ``round_up_to_power_2(used*3)``.  Previously, dict is shrinked only when
18907 - bpo-29922: Improved error messages in 'async with' when ``__aenter__()``
18908   or ``__aexit__()`` return non-awaitable object.
18910 - bpo-33199: Fix ``ma_version_tag`` in dict implementation is uninitialized
18911   when copying from key-sharing dict.
18913 - bpo-33053: When using the -m switch, sys.path[0] is now explicitly
18918 - bpo-33138: Changed standard error message for non-pickleable and
18919   non-copyable types. It now says "cannot pickle" instead of "can't pickle"
18922 - bpo-33018: Improve consistency of errors raised by ``issubclass()`` when
18923   called with a non-class and an abstract base class as the first and second
18926 - bpo-33083: ``math.factorial`` no longer accepts arguments that are not
18927   int-like. Patch by Pablo Galindo.
18929 - bpo-33041: Added new opcode :opcode:`END_ASYNC_FOR` and fixes the
18934   * Jumping into an ``async for`` loop is now disabled.
18937 - bpo-25750: Fix rare Python crash due to bad refcounting in
18941 - bpo-33041: Fixed bytecode generation for "async for" with a complex
18945 - bpo-33026: Fixed jumping out of "with" block by setting f_lineno.
18947 - bpo-33005: Fix a crash on fork when using a custom memory allocator (ex:
18952 - bpo-32911: Due to unexpected compatibility issues discovered during
18953   downstream beta testing, reverted :issue:`29463`. ``docstring`` field is
18955   which was added in 3.7a1.  Docstring expression is restored as a first
18958 - bpo-17288: Prevent jumps from 'return' and 'exception' trace events.
18960 - bpo-32946: Importing names from already imported module with "from ...
18961   import ..." is now 30% faster if the module is not a package.
18963 - bpo-32932: Make error message more revealing when there are non-str
18966 - bpo-32925: Optimized iterating and containing test for literal lists
18967   consisting of non-constants: ``x in [a, b]`` and ``for x in [a, b]``. The
18970 - bpo-32889: Update Valgrind suppression list to account for the rename of
18973 - bpo-32836: Don't use temporary variables in cases of list/dict/set
18976 - bpo-31356: Remove the new API added in bpo-31356 (gc.ensure_disabled()
18979 - bpo-32305: For namespace packages, ensure that both ``__file__`` and
18982 - bpo-32303: Make sure ``__spec__.loader`` matches ``__loader__`` for
18985 - bpo-32711: Fix the warning messages for Python/ast_unparse.c. Patch by
18988 - bpo-32583: Fix possible crashing in builtin Unicode decoders caused by
18989   write out-of-bound errors when using customized decode error handlers.
18991 - bpo-32489: A :keyword:`continue` statement is now allowed in the
18994 - bpo-17611: Simplified the interpreter loop by moving the logic of
19006 - bpo-32285: New function unicodedata.is_normalized, which can check whether
19007   a string is in a specific normal form.
19009 - bpo-10544: Yield expressions are now disallowed in comprehensions and
19012 - bpo-32117: Iterable unpacking is now allowed without parentheses in yield
19016 - bpo-31902: Fix the ``col_offset`` attribute for ast nodes
19020 - bpo-25862: Fix assertion failures in the ``tell()`` method of
19023 - bpo-21983: Fix a crash in `ctypes.cast()` in case the type argument is a
19026 - bpo-31577: Fix a crash in `os.utime()` in case of a bad ns argument. Patch
19029 - bpo-29832: Remove references to 'getsockaddrarg' from various socket error
19033 -------
19035 - bpo-35845: Add 'order' parameter to memoryview.tobytes().
19037 - bpo-35864: The _asdict() method for collections.namedtuple now returns a
19040 - bpo-35537: An ExitStack is now used internally within subprocess.Popen to
19045 - bpo-35847: RISC-V needed the CTYPES_PASS_BY_REF_HACK.  Fixes ctypes
19048 - bpo-35813: Shared memory submodule added to multiprocessing to avoid need
19051 - bpo-35780: Fix lru_cache() errors arising in recursive, reentrant, or
19052   multi-threaded code. These errors could result in orphan links and in the
19056   misordering of links when errors are encountered.  Sync-up the C code and
19059   cache entry is reduced by almost half.  Fix counting of cache misses. In
19063 - bpo-35537: :func:`os.posix_spawn` and :func:`os.posix_spawnp` now have a
19066 - bpo-23846: :class:`asyncio.ProactorEventLoop` now catches and logs send
19067   errors when the self-pipe is full.
19069 - bpo-34323: :mod:`asyncio`: Enhance ``IocpProactor.close()`` log: wait 1
19070   second before the first log, then log every second. Log also the number of
19073 - bpo-35674: Add a new :func:`os.posix_spawnp` function. Patch by Joannah
19076 - bpo-35733: ``ast.Constant(boolean)`` no longer an instance of
19079 - bpo-35726: QueueHandler.prepare() now makes a copy of the record before
19083 - bpo-35719: Sped up multi-argument :mod:`math` functions atan2(),
19084   copysign(), remainder() and hypot() by 1.3--2.5 times.
19086 - bpo-35717: Fix KeyError exception raised when using enums and compile.
19089 - bpo-35699: Fixed detection of Visual Studio Build Tools 2017 in distutils
19091 - bpo-32710: Fix memory leaks in asyncio ProactorEventLoop on overlapped
19094 - bpo-35702: The :data:`time.CLOCK_UPTIME_RAW` constant is now available for
19097 - bpo-32710: Fix a memory leak in asyncio in the ProactorEventLoop when
19101 - bpo-35682: Fix ``asyncio.ProactorEventLoop.sendfile()``: don't attempt to
19104 - bpo-35283: Add a deprecated warning for the
19105   :meth:`threading.Thread.isAlive` method. Patch by Dong-hee Na.
19107 - bpo-35664: Improve operator.itemgetter() performance by 33% with optimized
19109   single non-negative integer index into a tuple (which is the typical use
19112 - bpo-35643: Fixed a SyntaxWarning: invalid escape sequence in
19115 - bpo-35619: Improved support of custom data descriptors in :func:`help` and
19118 - bpo-28503: The `crypt` module now internally uses the `crypt_r()` library
19121 - bpo-35614: Fixed help() on metaclasses. Patch by Sanyam Khurana.
19123 - bpo-35568: Expose ``raise(signum)`` as `raise_signal`
19125 - bpo-35588: The floor division and modulo operations and the :func:`divmod`
19126   function on :class:`fractions.Fraction` types are 2--4x faster. Patch by
19129 - bpo-35585: Speed-up building enums by value, e.g. http.HTTPStatus(200).
19131 - bpo-30561: random.gammavariate(1.0, beta) now computes the same result as
19136 - bpo-35537: The :mod:`subprocess` module can now use the
19139 - bpo-35526: Delaying the 'joke' of barry_as_FLUFL.mandatory to Python
19142 - bpo-35523: Remove :mod:`ctypes` callback workaround: no longer create a
19146 - bpo-31784: :func:`uuid.uuid1` now calls :func:`time.time_ns` rather than
19149 - bpo-35513: :class:`~unittest.runner.TextTestRunner` of
19152   :func:`time.time` can go backwards, whereas :func:`time.perf_counter` is
19155 - bpo-35502: Fixed reference leaks in
19159 - bpo-35348: Make :func:`platform.architecture` parsing of ``file`` command
19160   output more reliable: add the ``-b`` option to the ``file`` command to
19164 - bpo-35491: :mod:`multiprocessing`: Add ``Pool.__repr__()`` and enhance
19169 - bpo-35477: :meth:`multiprocessing.Pool.__enter__` now fails if the pool is
19172 - bpo-31446: Copy command line that was passed to CreateProcessW since this
19175 - bpo-35471: Python 2.4 dropped MacOS 9 support. The macpath module was
19176   deprecated in Python 3.7. The module is now removed.
19178 - bpo-23057: Unblock Proactor event loop when keyboard interrupt is received
19181 - bpo-35052: Fix xml.dom.minidom cloneNode() on a document with an entity:
19184 - bpo-20239: Allow repeated assignment deletion of
19187 - bpo-17185: Set ``__signature__`` on mock for :mod:`inspect` to get
19190 - bpo-35445: Memory errors during creating posix.environ no longer ignored.
19192 - bpo-35415: Validate fileno= argument to socket.socket().
19194 - bpo-35424: :class:`multiprocessing.Pool` destructor now emits
19195   :exc:`ResourceWarning` if the pool is still running.
19197 - bpo-35330: When a :class:`Mock` instance was used to wrap an object, if
19198   `side_effect` is used in one of the mocks of it methods, don't call the
19200   same way that it is done with return_value.
19202 - bpo-35346: Drop Mac OS 9 and Rhapsody support from the :mod:`platform`
19206 - bpo-10496: :func:`~distutils.utils.check_environ` of
19211 - bpo-10496: :func:`posixpath.expanduser` now returns the input *path*
19212   unchanged if the ``HOME`` environment variable is not set and the current
19218 - bpo-35389: :func:`platform.libc_ver` now uses
19220   parameter is not set.
19222 - bpo-35394: Add empty slots to asyncio abstract protocols.
19224 - bpo-35310: Fix a bug in :func:`select.select` where, in some cases, the
19230 - bpo-35380: Enable TCP_NODELAY on Windows for proactor asyncio event loop.
19232 - bpo-35341: Add generic version of ``collections.OrderedDict`` to the
19235 - bpo-35371: Fixed possible crash in ``os.utime()`` on Windows when pass
19238 - bpo-35346: :func:`platform.uname` now redirects ``stderr`` to
19241 - bpo-35066: Previously, calling the strftime() method on a datetime object
19244   python implementation did not match this behavior. Datetime is now PEP-399
19247 - bpo-35345: The function `platform.popen` has been removed, it was
19250 - bpo-35344: On macOS, :func:`platform.platform` now uses
19251   :func:`platform.mac_ver`, if it returns a non-empty release string, to get
19254 - bpo-35312: Make ``lib2to3.pgen2.parse.ParseError`` round-trip pickle-able.
19257 - bpo-35308: Fix regression in ``webbrowser`` where default browsers may be
19260 - bpo-24746: Avoid stripping trailing whitespace in doctest fancy diff.
19264 - bpo-28604: :func:`locale.localeconv` now sets temporarily the ``LC_CTYPE``
19266   monetary strings are non-ASCII. This temporary change affects other
19269 - bpo-35277: Update ensurepip to install pip 18.1 and setuptools 40.6.2.
19271 - bpo-24209: Adds IPv6 support when invoking http.server directly.
19273 - bpo-35226: Recursively check arguments when testing for equality of
19275   parameters used to create ancestors of mocks in ``mock_calls`` is not
19278 - bpo-29564: The warnings module now suggests to enable tracemalloc if the
19279   source is specified, the tracemalloc module is available, but tracemalloc
19280   is not tracing memory allocations.
19282 - bpo-35189: Modify the following fnctl function to retry if interrupted by
19285 - bpo-30064: Use add_done_callback() in sock_* asyncio API to unsubscribe
19288 - bpo-35186: Removed the "built with" comment added when ``setup.py upload``
19289   is used with either ``bdist_rpm`` or ``bdist_dumb``.
19291 - bpo-35152: Allow sending more than 2 GB at once on a multiprocessing
19292   connection on non-Windows systems.
19294 - bpo-35062: Fix incorrect parsing of
19297 - bpo-35065: Remove `StreamReaderProtocol._untrack_reader`. The call to
19298   `_untrack_reader` is currently performed too soon, causing the protocol to
19302 - bpo-34160: ElementTree and minidom now preserve the attribute order
19305 - bpo-35079: Improve difflib.SequenceManager.get_matching_blocks doc by
19306   adding 'non-overlapping' and changing '!=' to '<'.
19308 - bpo-33710: Deprecated ``l*gettext()`` functions and methods in the
19314 - bpo-35017: :meth:`socketserver.BaseServer.serve_forever` now exits
19315   immediately if it's :meth:`~socketserver.BaseServer.shutdown` method is
19316   called while it is polling for new events.
19318 - bpo-35024: `importlib` no longer logs `wrote <bytecode path>` redundantly
19319   after `(created|could not create) <bytecode path>` is already logged.
19322 - bpo-35047: ``unittest.mock`` now includes mock calls in exception messages
19326 - bpo-31047: Fix ``ntpath.abspath`` regression where it didn't remove a
19329 - bpo-35053: tracemalloc now tries to update the traceback when an object is
19333 - bpo-31553: Add the --json-lines option to json.tool. Patch by hongweipeng.
19335 - bpo-34794: Fixed a leak in Tkinter when pass the Python wrapper around
19338 - bpo-34909: Enum: fix grandchildren subclassing when parent mixed with
19341 - bpo-35022: :class:`unittest.mock.MagicMock` now supports the
19344 - bpo-35008: Fixed references leaks when call the ``__setstate__()`` method
19348 - bpo-23420: Verify the value for the parameter '-s' of the cProfile CLI.
19351 - bpo-33947: dataclasses now handle recursive reprs without raising
19354 - bpo-34890: Make :func:`inspect.iscoroutinefunction`,
19358 - bpo-34521: Use :func:`socket.CMSG_SPACE` to calculate ancillary data size
19363 - bpo-31522: The `mailbox.mbox.get_string` function *from_* parameter can
19364   now successfully be set to a non-default value.
19366 - bpo-34970: Protect tasks weak set manipulation in ``asyncio.all_tasks()``
19368 - bpo-34969: gzip: Add --fast, --best on the gzip CLI, these parameters will
19373 - bpo-16965: The :term:`2to3` :2to3fixer:`execfile` fixer now opens the file
19376 - bpo-34966: :mod:`pydoc` now supports aliases not only to methods defined
19377   in the end class, but also to inherited methods.  The docstring is not
19380 - bpo-34926: :meth:`mimetypes.MimeTypes.guess_type` now accepts
19381   :term:`path-like object` in addition to url strings. Patch by Mayank
19384 - bpo-23831: Add ``moveto()`` method to the ``tkinter.Canvas`` widget. Patch
19387 - bpo-34941: Methods ``find()``, ``findtext()`` and ``findall()`` of the
19391 - bpo-32680: :class:`smtplib.SMTP` objects now always have a `sock`
19394 - bpo-34769: Fix for async generators not finalizing when event loop is in
19397 - bpo-34936: Fix ``TclError`` in ``tkinter.Spinbox.selection_element()``.
19400 - bpo-34829: Add methods ``selection_from``, ``selection_range``,
19404 - bpo-34911: Added *secure_protocols* argument to
19409 - bpo-34922: Fixed integer overflow in the :meth:`~hashlib.shake.digest()`
19413 - bpo-34925: 25% speedup in argument parsing for the functions in the bisect
19416 - bpo-34900: Fixed :meth:`unittest.TestCase.debug` when used to call test
19419 - bpo-34844: logging.Formatter enhancement - Ensure styles and fmt matches
19420   in logging.Formatter - Added validate method in each format style class:
19421   StrFormatStyle, PercentStyle, StringTemplateStyle. - This method is called
19422   in the constructor of logging.Formatter class - Also re-raise the KeyError
19426 - bpo-34897: Adjust test.support.missing_compiler_executable check so that a
19427   nominal command name of "" is ignored. Patch by Michael Felt.
19429 - bpo-34871: Fix inspect module polluted ``sys.modules`` when parsing
19432 - bpo-34898: Add `mtime` argument to `gzip.compress` for reproducible
19435 - bpo-28441: On Cygwin and MinGW, ensure that ``sys.executable`` always
19437   (unless it is a symbolic link).
19439 - bpo-34866: Adding ``max_num_fields`` to ``cgi.FieldStorage`` to make DOS
19443 - bpo-34711: http.server ensures it reports HTTPStatus.NOT_FOUND when the
19444   local path ends with "/" and is not a directory, even if the underlying OS
19448 - bpo-34872: Fix self-cancellation in C implementation of asyncio.Task
19450 - bpo-34849: Don't log waiting for ``selector.select`` in asyncio loop
19451   iteration. The waiting is pretty normal for any asyncio program, logging
19455 - bpo-34022: The :envvar:`SOURCE_DATE_EPOCH` environment variable no longer
19459 - bpo-34819: Use a monotonic clock to compute timeouts in
19461   timeouts from deviating when the system clock is adjusted.
19463 - bpo-34758: Add .wasm -> application/wasm to list of recognized file types
19466 - bpo-34789: :func:`xml.sax.make_parser` now accepts any iterable as its
19469 - bpo-34334: In :class:`QueueHandler`, clear `exc_text` from
19472 - bpo-34687: On Windows, asyncio now uses ProactorEventLoop, instead of
19475 - bpo-5950: Support reading zip files with archive comments in
19478 - bpo-32892: The parser now represents all constants as
19484 - bpo-34728: Add deprecation warning when `loop` is used in methods:
19487 - bpo-34738: ZIP files created by :mod:`distutils` will now include entries
19490 - bpo-34659: Add an optional *initial* argument to itertools.accumulate().
19492 - bpo-29577: Support multiple mixin classes when creating Enums.
19494 - bpo-34670: Add SSLContext.post_handshake_auth and
19498 - bpo-32718: The Activate.ps1 script from venv works with PowerShell Core
19499   6.1 and is now available under all operating systems.
19501 - bpo-31177: Fix bug that prevented using :meth:`reset_mock
19504 - bpo-34672: Add a workaround, so the ``'Z'`` :func:`time.strftime`
19507 - bpo-34666: Implement ``asyncio.StreamWriter.awrite`` and
19512 - bpo-6721: Acquire the logging module's commonly used internal locks while
19515 - bpo-34658: Fix a rare interpreter unhandled exception state SystemError
19520 - bpo-34652: Ensure :func:`os.lchmod` is never defined on Linux.
19522 - bpo-34638: Store a weak reference to stream reader to break strong
19524   close the socket if the stream is deleted (garbage collected) without
19527 - bpo-34536: `Enum._missing_`:  raise `ValueError` if None returned and
19528   `TypeError` if non-member is returned.
19530 - bpo-34636: Speed up re scanning of many non-matching characters for \s \w
19533 - bpo-24412: Add :func:`~unittest.addModuleCleanup()` and
19538 - bpo-34630: Don't log SSL certificate errors in asyncio code (connection
19539   error logging is skipped already).
19541 - bpo-32490: Prevent filename duplication in :mod:`subprocess` exception
19544 - bpo-34363: dataclasses.asdict() and .astuple() now handle namedtuples
19547 - bpo-34625: Update vendorized expat library version to 2.2.6.
19549 - bpo-32270: The subprocess module no longer mistakenly closes redirected
19553 - bpo-34622: Create a dedicated ``asyncio.CancelledError``,
19559 - bpo-34610: Fixed iterator of :class:`multiprocessing.managers.DictProxy`.
19561 - bpo-34421: Fix distutils logging for non-ASCII strings.  This caused
19564 - bpo-34604: Fix possible mojibake in the error message of `pwd.getpwnam`
19568 - bpo-30977: Make uuid.UUID use ``__slots__`` to reduce its memory
19571 - bpo-34574: OrderedDict iterators are not exhausted during pickling
19574 - bpo-8110: Refactored :mod:`subprocess` to check for Windows-specific
19577 - bpo-34530: ``distutils.spawn.find_executable()`` now falls back on
19578   :data:`os.defpath` if the ``PATH`` environment variable is not set.
19580 - bpo-34563: On Windows, fix multiprocessing.Connection for very large read:
19582   INT_MAX (usually ``2**31-1``).
19584 - bpo-34558: Correct typo in Lib/ctypes/_aix.py
19586 - bpo-34282: Move ``Enum._convert`` to ``EnumMeta._convert_`` and fix enum
19589 - bpo-22872: When the queue is closed, :exc:`ValueError` is now raised by
19594 - bpo-34515: Fix parsing non-ASCII identifiers in
19597 - bpo-13312: Avoids a possible integer underflow (undefined behavior) in the
19601 - bpo-34472: Improved compatibility for streamed files in :mod:`zipfile`.
19605 - bpo-34454: Fix the .fromisoformat() methods of datetime types crashing
19606   when given unicode with non-UTF-8-encodable code points.  Specifically,
19610 - bpo-6700: Fix inspect.getsourcelines for module level frames/tracebacks.
19613 - bpo-34171: Running the :mod:`trace` module no longer creates the
19616 - bpo-34441: Fix crash when an ``ABC``-derived class with invalid
19617   ``__subclasses__`` is passed as the second argument to
19620 - bpo-34427: Fix infinite loop in ``a.extend(a)`` for ``MutableSequence``
19623 - bpo-34412: Make :func:`signal.strsignal` work on HP-UX. Patch by Michael
19626 - bpo-20849: shutil.copytree now accepts a new ``dirs_exist_ok`` keyword
19629 - bpo-31715: Associate ``.mjs`` file extension with
19632 - bpo-34384: :func:`os.readlink` now accepts :term:`path-like <path-like
19635 - bpo-22602: The UTF-7 decoder now raises :exc:`UnicodeDecodeError` for
19636   ill-formed sequences starting with "+" (as specified in RFC 2152).  Patch
19639 - bpo-2122: The :meth:`mmap.flush() <mmap.mmap.flush>` method now returns
19642 - bpo-34341: Appending to the ZIP archive with the ZIP64 extension no longer
19645 - bpo-34333: Fix %-formatting in :meth:`pathlib.PurePath.with_suffix` when
19648 - bpo-18540: The :class:`imaplib.IMAP4` and :class:`imaplib.IMAP4_SSL`
19650   of *host* parameter (``''``) is used.
19652 - bpo-26502: Implement ``traceback.FrameSummary.__len__()`` method to
19655 - bpo-34318: :func:`~unittest.TestCase.assertRaises`,
19659   passed callable is None. They no longer ignore unknown keyword arguments
19663 - bpo-9372: Deprecate :meth:`__getitem__` methods of
19667 - bpo-33613: Fix a race condition in ``multiprocessing.semaphore_tracker``
19671 - bpo-34248: Report filename in the exception raised when the database file
19673   OS-related error. Patch by Zsolt Cserna.
19675 - bpo-33089: Add math.dist() to compute the Euclidean distance between two
19678 - bpo-34246: :meth:`smtplib.SMTP.send_message` no longer modifies the
19681 - bpo-31047: Fix ``ntpath.abspath`` for invalid paths on windows. Patch by
19684 - bpo-32321: Add pure Python fallback for functools.reduce. Patch by Robert
19687 - bpo-34270: The default asyncio task class now always has a name which can
19689   :meth:`~asyncio.Task.set_name`) and is visible in the :func:`repr` output.
19693   If no initial name is set, the default Task implementation generates a
19694   name like ``Task-1`` using a monotonic counter.
19696 - bpo-34263: asyncio's event loop will not pass timeouts longer than one day
19699 - bpo-34035: Fix several AttributeError in zipfile seek() methods. Patch by
19702 - bpo-32215: Fix performance regression in :mod:`sqlite3` when a DML
19705 - bpo-34075: Deprecate passing non-ThreadPoolExecutor instances to
19708 - bpo-34251: Restore ``msilib.Win64`` to preserve backwards compatibility
19711 - bpo-19891: Ignore errors caused by missing / non-writable homedir while
19715 - bpo-33089: Enhanced math.hypot() to support more than two dimensions.
19717 - bpo-34228: tracemalloc: PYTHONTRACEMALLOC=0 environment variable and -X
19721 - bpo-13041: Use :func:`shutil.get_terminal_size` to calculate the terminal
19723   Zbyszek Jędrzejewski-Szmek.
19725 - bpo-34213: Allow frozen dataclasses to have a field named "object".
19728 - bpo-34052: :meth:`sqlite3.Connection.create_aggregate`,
19736 - bpo-34197: Attributes *skipinitialspace*, *doublequote* and *strict* of
19740 - bpo-32788: Errors other than :exc:`TypeError` raised in methods
19744 - bpo-21446: The :2to3fixer:`reload` fixer now uses :func:`importlib.reload`
19747 - bpo-940286: pydoc's ``Helper.showtopic()`` method now prints the cross
19750 - bpo-34164: :func:`base64.b32decode` could raise UnboundLocalError or
19754 - bpo-33729: Fixed issues with arguments parsing in :mod:`hashlib`.
19756 - bpo-34097: ZipFile can zip files older than 1980-01-01 and newer than
19757   2107-12-31 using a new ``strict_timestamps`` parameter at the cost of
19760 - bpo-34108: Remove extraneous CR in 2to3 refactor.
19762 - bpo-34070: Make sure to only check if the handle is a tty, when opening a
19763   file with ``buffering=-1``.
19765 - bpo-27494: Reverted :issue:`27494`. 2to3 rejects now a trailing comma in
19768 - bpo-33967: functools.singledispatch now raises TypeError instead of
19771 - bpo-34041: Add the parameter *deterministic* to the
19775 - bpo-34056: Ensure the loader shim created by ``imp.load_module`` always
19777   ``imp.load_module`` with :pep:`552` hash-based pycs.
19779 - bpo-34054: The multiprocessing module now uses the monotonic clock
19783 - bpo-34043: Optimize tarfile uncompress performance about 15% when gzip is
19786 - bpo-34044: ``subprocess.Popen`` now copies the *startupinfo* argument to
19790 - bpo-34010: Fixed a performance regression for reading streams with
19794 - bpo-34019: webbrowser: Correct the arguments passed to Opera Browser when
19797 - bpo-34003: csv.DictReader now creates dicts instead of OrderedDicts. Patch
19800 - bpo-33978: Closed existing logging handlers before reconfiguration via
19803 - bpo-14117: Make minor tweaks to turtledemo. The 'wikipedia' example is now
19804   'rosette', describing what it draws.  The 'penrose' print output is
19805   reduced. The'1024' output of 'tree' is eliminated.
19807 - bpo-33974: Fixed passing lists and tuples of strings containing special
19811 - bpo-27500: Fix getaddrinfo to resolve IPv6 addresses correctly.
19813 - bpo-24567: Improve random.choices() to handle subnormal input weights that
19816 - bpo-33871: Fixed integer overflow in :func:`os.readv`, :func:`os.writev`,
19818   *headers* or *trailers* arguments (on BSD-based OSes and macOS).
19820 - bpo-25007: Add :func:`copy.copy` and :func:`copy.deepcopy` support to zlib
19823 - bpo-33929: multiprocessing: Fix a race condition in Popen of
19830 - bpo-33899: Tokenize module now implicitly emits a NEWLINE when provided
19834 - bpo-33897: Added a 'force' keyword argument to logging.basicConfig().
19836 - bpo-33695: :func:`shutil.copytree` uses :func:`os.scandir` function and
19838   The speedup for copying a directory with 8000 files is around +9% on
19840   of :func:`os.stat` syscalls is reduced by 38% making
19844 - bpo-33916: bz2 and lzma: When Decompressor.__init__() is called twice,
19847 - bpo-32568: Make select.epoll() and its documentation consistent regarding
19850 - bpo-33833: Fixed bug in asyncio where ProactorSocketTransport logs
19853 - bpo-33663: Convert content length to string before putting to header.
19855 - bpo-33721: :mod:`os.path` functions that return a boolean result like
19869 - bpo-26544: Fixed implementation of :func:`platform.libc_ver`. It almost
19872 - bpo-33843: Remove deprecated ``cgi.escape``, ``cgi.parse_qs`` and
19875 - bpo-33842: Remove ``tarfile.filemode`` which is deprecated since Python
19878 - bpo-30167: Prevent site.main() exception if PYTHONSTARTUP is set. Patch by
19881 - bpo-33805: Improve error message of dataclasses.replace() when an InitVar
19882   is not specified
19884 - bpo-33687: Fix the call to ``os.chmod()`` for ``uu.decode()`` if a mode is
19887 - bpo-33812: Datetime instance d with non-None tzinfo, but with
19888   d.tzinfo.utcoffset(d) returning None is now treated as naive by the
19891 - bpo-32108: In configparser, don't clear section when it is assigned to
19894 - bpo-27397: Make email module properly handle invalid-length base64
19897 - bpo-33578: Implement multibyte encoder/decoder state methods
19899 - bpo-30805: Avoid race condition with debug logging
19901 - bpo-33476: Fix _header_value_parser.py when address group is missing final
19902   ';'. Contributed by Enrique Perez-Terron
19904 - bpo-33694: asyncio: Fix a race condition causing data loss on
19907 - bpo-32493: Correct test for ``uuid_enc_be`` availability in
19910 - bpo-33792: Add asyncio.WindowsSelectorEventLoopPolicy and
19913 - bpo-33274: W3C DOM Level 1 specifies return value of
19917 - bpo-33778: Update ``unicodedata``'s database to Unicode version 11.0.0.
19919 - bpo-33165: Added a stacklevel parameter to logging calls to allow use of
19922 - bpo-33770: improve base64 exception message for encoded inputs of invalid
19925 - bpo-33769: asyncio/start_tls: Fix error message; cancel callbacks in case
19926   of an unhandled error; mark SSLTransport as closed if it is aborted.
19928 - bpo-33767: The concatenation (``+``) and repetition (``*``) sequence
19932 - bpo-33734: asyncio/ssl: Fix AttributeError, increase default handshake
19935 - bpo-31014: Fixed creating a controller for :mod:`webbrowser` when a user
19939 - bpo-2504: Add gettext.pgettext() and variants.
19941 - bpo-33197: Add description property for _ParameterKind
19943 - bpo-32751: When cancelling the task due to a timeout,
19944   :meth:`asyncio.wait_for` will now wait until the cancellation is complete.
19946 - bpo-32684: Fix gather to propagate cancellation of itself even with
19949 - bpo-33654: Support protocol type switching in SSLTransport.set_protocol().
19951 - bpo-33674: Pause the transport as early as possible to further reduce the
19954 - bpo-33671: :func:`shutil.copyfile`, :func:`shutil.copy`,
19956   platform-specific fast-copy syscalls on Linux and macOS in order to copy
19959   :func:`memoryview`-based variant of :func:`shutil.copyfileobj` is used.
19960   The speedup for copying a 512MiB file is about +26% on Linux, +50% on
19964 - bpo-33674: Fix a race condition in SSLProtocol.connection_made() of
19969 - bpo-31647: Fixed bug where calling write_eof() on a
19972 - bpo-32610: Make asyncio.all_tasks() return only pending tasks.
19974 - bpo-32410: Avoid blocking on file IO in sendfile fallback code
19976 - bpo-33469: Fix RuntimeError after closing loop that used run_in_executor
19978 - bpo-33672: Fix Task.__repr__ crash with Cython's bogus coroutines
19980 - bpo-33654: Fix transport.set_protocol() to support switching between
19984 - bpo-33652: Pickles of type variables and subscripted generics are now
19985   future-proof and compatible with older Python versions.
19987 - bpo-32493: Fixed :func:`uuid.uuid1` on FreeBSD.
19989 - bpo-33238: Add ``InvalidStateError`` to :mod:`concurrent.futures`.
19994 - bpo-33618: Finalize and document preliminary and experimental TLS 1.3
19997 - bpo-33625: Release GIL on `grp.getgrnam`, `grp.getgrgid`, `pwd.getpwnam`
20001 - bpo-33623: Fix possible SIGSGV when asyncio.Future is created in __del__
20003 - bpo-11874: Use a better regex when breaking usage into wrappable parts.
20006 - bpo-30877: Fixed a bug in the Python implementation of the JSON decoder
20008   the decoding. Based on patch by c-fos.
20010 - bpo-33604: Remove HMAC default to md5 marked for removal in 3.8 (removal
20013 - bpo-33582: Emit a deprecation warning for inspect.formatargspec
20015 - bpo-21145: Add ``functools.cached_property`` decorator, for computed
20018 - bpo-33570: Change TLS 1.3 cipher suite settings for compatibility with
20019   OpenSSL 1.1.1-pre6 and newer. OpenSSL 1.1.1 will have TLS 1.3 ciphers
20022 - bpo-28556: Do not simplify arguments to `typing.Union`. Now
20023   `Union[Manager, Employee]` is not simplified to `Employee` at runtime.
20027 - bpo-12486: :func:`tokenize.generate_tokens` is now documented as a public
20031 - bpo-33540: Add a new ``block_on_close`` class attribute to
20034 - bpo-33548: tempfile._candidate_tempdir_list should consider common TEMP
20037 - bpo-33109: argparse subparsers are once again not required by default,
20038   reverting the change in behavior introduced by bpo-26510 in 3.7.0a2.
20040 - bpo-33541: Remove unused private method ``_strptime.LocaleTime.__pad``
20043 - bpo-33536: dataclasses.make_dataclass now checks for invalid field names
20047 - bpo-33542: Prevent ``uuid.get_node`` from using a DUID instead of a MAC on
20050 - bpo-26819: Fix race condition with `ReadTransport.resume_reading` in
20053 - Fix failure in `typing.get_type_hints()` when ClassVar was provided as a
20056 - bpo-33516: :class:`unittest.mock.MagicMock` now supports the ``__round__``
20059 - bpo-28612: Added support for Site Maps to urllib's ``RobotFileParser`` as
20064 - bpo-28167: Remove platform.linux_distribution, which was deprecated since
20067 - bpo-33504: Switch the default dictionary implementation for
20071 - bpo-33505: Optimize asyncio.ensure_future() by reordering if checks: 1.17x
20074 - bpo-33497: Add errors param to cgi.parse_multipart and make an encoding in
20078 - bpo-29235: The :class:`cProfile.Profile` class can now be used as a
20081 - bpo-33495: Change dataclasses.Fields repr to use the repr of each of its
20083   actually represents.  This is especially true for the 'type' member.
20085 - bpo-26103: Correct ``inspect.isdatadescriptor`` to look for ``__set__`` or
20088 - bpo-29209: Removed the ``doctype()`` method and the *html* parameter of
20095 - bpo-33453: Fix dataclasses to work if using literal string type
20100 - bpo-28556: Minor fixes in typing module: add annotations to
20104 - bpo-33365: Print the header values besides the header keys instead just
20105   the header keys if *debuglevel* is set to >0 in :mod:`http.client`. Patch
20108 - bpo-20087: Updated alias mapping with glibc 2.27 supported locales.
20110 - bpo-33422: Fix trailing quotation marks getting deleted when looking up
20113 - bpo-28167: The function ``platform.linux_distribution`` and
20117 - bpo-33281: Fix ctypes.util.find_library regression on macOS.
20119 - bpo-33311: Text and html output generated by cgitb does not display
20120   parentheses if the current call is done directly in the module. Patch by
20123 - bpo-27300: The file classes in *tempfile* now accept an *errors* parameter
20126 - bpo-32933: :func:`unittest.mock.mock_open` now supports iteration over the
20129 - bpo-33217: Raise :exc:`TypeError` when looking up non-Enum objects in Enum
20132 - bpo-33197: Update error message when constructing invalid
20133   inspect.Parameters Patch by Dong-hee Na.
20135 - bpo-33383: Fixed crash in the get() method of the :mod:`dbm.ndbm` database
20136   object when it is called with a single argument.
20138 - bpo-33375: The warnings module now finds the Python file associated with a
20140   This is consistent with how tracebacks and pdb find filenames, and should
20143 - bpo-33336: ``imaplib`` now allows ``MOVE`` command in ``IMAP4.uid()`` (RFC
20147 - bpo-32455: Added *jump* parameter to :func:`dis.stack_effect`.
20149 - bpo-27485: Rename and deprecate undocumented functions in
20152 - bpo-33332: Add ``signal.valid_signals()`` to expose the POSIX sigfillset()
20155 - bpo-33251: `ConfigParser.items()` was fixed so that key-value pairs passed
20158 - bpo-33329: Fix multiprocessing regression on newer glibcs
20160 - bpo-33334: :func:`dis.stack_effect` now supports all defined opcodes
20163 - bpo-991266: Fix quoting of the ``Comment`` attribute of
20166 - bpo-33131: Upgrade bundled version of pip to 10.0.1.
20168 - bpo-33308: Fixed a crash in the :mod:`parser` module when converting an ST
20172 - bpo-23403: lib2to3 now uses pickle protocol 4 for pre-computed grammars.
20174 - bpo-33266: lib2to3 now recognizes ``rf'...'`` strings.
20176 - bpo-11594: Ensure line-endings are respected when using lib2to3.
20178 - bpo-33254: Have :func:`importlib.resources.contents` and
20182 - bpo-33265: ``contextlib.ExitStack`` and ``contextlib.AsyncExitStack`` now
20185 - bpo-33263: Fix FD leak in `_SelectorSocketTransport`  Patch by Vlad
20188 - bpo-33256: Fix display of ``<module>`` call in the html produced by
20191 - bpo-33144: ``random.Random()`` and its subclassing mechanism got optimized
20197 - bpo-33185: Fixed regression when running pydoc with the :option:`-m`
20204 - bpo-29613: Added support for the ``SameSite`` cookie flag to the
20207 - bpo-33169: Delete entries of ``None`` in :data:`sys.path_importer_cache`
20208   when :meth:`importlib.machinery.invalidate_caches` is called.
20210 - bpo-33203: ``random.Random.choice()`` now raises ``IndexError`` for empty
20214 - bpo-33224: Update difflib.mdiff() for :pep:`479`.  Convert an uncaught
20215   StopIteration in a generator into a return-statement.
20217 - bpo-33209: End framing at the end of C implementation of
20220 - bpo-32861: The urllib.robotparser's ``__str__`` representation now
20221   includes wildcard entries and the "Crawl-delay" and "Request-rate" fields.
20225 - bpo-23403: ``DEFAULT_PROTOCOL`` in :mod:`pickle` was bumped to 4. Protocol
20226   4 is described in :pep:`3154` and available since Python 3.4. It offers
20230 - bpo-20104: Improved error handling and fixed a reference leak in
20233 - bpo-33106: Deleting a key from a read-only dbm database raises module
20236 - bpo-33175: In dataclasses, Field.__set_name__ now looks up the
20240 - bpo-32380: Create functools.singledispatchmethod to support generic single
20243 - bpo-33141: Have Field objects pass through __set_name__ to their default
20246 - bpo-33096: Allow ttk.Treeview.insert to insert iid that has a false
20250 - bpo-32873: Treat type variables and special typing forms as immutable by
20254 - bpo-33134: When computing dataclass's __hash__, use the lookup table to
20255   contain the function which returns the __hash__ value.  This is an
20259 - bpo-33127: The ssl module now compiles with LibreSSL 2.7.1.
20261 - bpo-32505: Raise TypeError if a member variable of a dataclass is of type
20264 - bpo-33078: Fix the failure on OSX caused by the tests relying on
20267 - bpo-33116: Add 'Field' to dataclasses.__all__.
20269 - bpo-32896: Fix an error where subclassing a dataclass with a field that
20272 - bpo-33100: Dataclasses: If a field has a default value that's a
20276 - bpo-32953: If a non-dataclass inherits from a frozen dataclass, allow
20279   hierarchy to be either all frozen or all non-frozen.
20281 - bpo-33097: Raise RuntimeError when ``executor.submit`` is called during
20284 - bpo-32968: Modulo and floor division involving Fraction and float should
20287 - bpo-33061: Add missing ``NoReturn`` to ``__all__`` in typing.py
20289 - bpo-33078: Fix the size handling in multiprocessing.Queue when a pickling
20292 - bpo-33064: lib2to3 now properly supports trailing commas after ``*args``
20295 - bpo-33056: FIX properly close leaking fds in
20298 - bpo-33021: Release the GIL during fstat() calls, avoiding hang of all
20302 - bpo-31804: Avoid failing in multiprocessing.Process if the standard
20305 - bpo-33034: Providing an explicit error message when casting the port
20306   property to anything that is not an integer value using ``urlparse()`` and
20309 - bpo-30249: Improve struct.unpack_from() exception messages for problems
20312 - bpo-33037: Skip sending/receiving data after SSL transport closing.
20314 - bpo-27683: Fix a regression in :mod:`ipaddress` that result of
20315   :meth:`hosts` is empty when the network is constructed by a tuple
20318 - bpo-22674: Add the strsignal() function in the signal module that returns
20321 - bpo-32999: Fix C implementation of ``ABC.__subclasscheck__(cls,
20322   subclass)`` crashed when ``subclass`` is not a type object.
20324 - bpo-33009: Fix inspect.signature() for single-parameter partialmethods.
20326 - bpo-32969: Expose several missing constants in zlib and fix corresponding
20329 - bpo-32056: Improved exceptions raised for invalid number of channels and
20333 - bpo-32970: Improved disassembly of the MAKE_FUNCTION instruction.
20335 - bpo-32844: Fix wrong redirection of a low descriptor (0 or 1) to stderr in
20336   subprocess if another low descriptor is closed.
20338 - bpo-32960: For dataclasses, disallow inheriting frozen from non-frozen
20339   classes, and also disallow inheriting non-frozen from frozen classes. This
20342 - bpo-32713: Fixed tarfile.itn handling of out-of-bounds float values. Patch
20345 - bpo-32257: The ssl module now contains OP_NO_RENEGOTIATION constant,
20348 - bpo-32951: Direct instantiation of SSLSocket and SSLObject objects is now
20353 - bpo-32929: Remove the tri-state parameter "hash", and add the boolean
20354   "unsafe_hash". If unsafe_hash is True, add a __hash__ function, but if a
20355   __hash__ exists, raise TypeError.  If unsafe_hash is False, add a __hash__
20356   based on the values of eq= and frozen=.  The unsafe_hash=False behavior is
20357   the same as the old hash=None behavior.  unsafe_hash=False is the default,
20360 - bpo-32947: Add OP_ENABLE_MIDDLEBOX_COMPAT and test workaround for TLSv1.3
20363 - bpo-32146: Document the interaction between frozen executables and the
20366 - bpo-30622: The ssl module now detects missing NPN support in LibreSSL.
20368 - bpo-32922: dbm.open() now encodes filename with the filesystem encoding
20371 - bpo-32759: Free unused arenas in multiprocessing.heap.
20373 - bpo-32859: In ``os.dup2``, don't check every call whether the ``dup3``
20376 - bpo-32556: nt._getfinalpathname, nt._getvolumepathname and
20379 - bpo-21060: Rewrite confusing message from setup.py upload from "No dist
20383 - bpo-32857: In :mod:`tkinter`, ``after_cancel(None)`` now raises a
20387 - bpo-32852: Make sure sys.argv remains as a list when running trace.
20389 - bpo-31333: ``_abc`` module is added.  It is a speedup module with C
20392   subclass are up to 1.5x faster. In addition, this makes Python start-up up
20401 - bpo-32841: Fixed `asyncio.Condition` issue which silently ignored
20405 - bpo-32819: ssl.match_hostname() has been simplified and no longer depends
20409 - bpo-19675: ``multiprocessing.Pool`` no longer leaks processes if its
20412 - bpo-32394: socket: Remove
20414   Windows during run-time.
20416 - bpo-31787: Fixed refleaks of ``__init__()`` methods in various modules.
20419 - bpo-30157: Fixed guessing quote and delimiter in csv.Sniffer.sniff() when
20420   only the last field is quoted.  Patch by Jake Davis.
20422 - bpo-30688: Added support of ``\N{name}`` escapes in regular expressions.
20425 - bpo-32792: collections.ChainMap() preserves the order of the underlying
20428 - bpo-32775: :func:`fnmatch.translate()` no longer produces patterns which
20429   contain set operations. Sets starting with '[' or containing '--', '&&',
20434 - bpo-32622: Implement native fast sendfile for Windows proactor event loop.
20436 - bpo-32777: Fix a rare but potential pre-exec child process deadlock in
20441 - bpo-32647: The ctypes module used to depend on indirect linking for
20442   dlopen. The shared extension is now explicitly linked against libdl on
20445 - bpo-32749: A :mod:`dbm.dumb` database opened with flags 'r' is now
20446   read-only. :func:`dbm.dumb.open` with flags 'r' and 'w' no longer creates
20449 - bpo-32741: Implement ``asyncio.TimerHandle.when()`` method.
20451 - bpo-32691: Use mod_spec.parent when running modules with pdb
20453 - bpo-32734: Fixed ``asyncio.Lock()`` safety issue which allowed acquiring
20457 - bpo-32727: Do not include name field in SMTP envelope from address. Patch
20460 - bpo-31453: Add TLSVersion constants and SSLContext.maximum_version /
20465 - bpo-24334: Internal implementation details of ssl module were cleaned up.
20470 - bpo-31848: Fix the error handling in Aifc_read.initfp() when the SSND
20471   chunk is not found. Patch by Zackery Spytz.
20473 - bpo-32585: Add Ttk spinbox widget to :mod:`tkinter.ttk`.  Patch by Alan D
20476 - bpo-32512: :mod:`profile` CLI accepts `-m module_name` as an alternative
20479 - bpo-8525: help() on a type now displays builtin subclasses. This is
20485 - bpo-31639: http.server now exposes a ThreadingHTTPServer class and uses it
20486   when the module is run with ``-m`` to cope with web browsers pre-opening
20489 - bpo-29877: compileall: import ProcessPoolExecutor only when needed,
20492 - bpo-32221: Various functions returning tuple containing IPv6 addresses now
20493   omit ``%scope`` part since the same information is already encoded in
20496   interface name is omitted.
20498 - bpo-32147: :func:`binascii.unhexlify` is now up to 2 times faster. Patch
20501 - bpo-30693: The TarFile class now recurses directories in a reproducible
20504 - bpo-30693: The ZipFile class now recurses directories in a reproducible
20507 - bpo-31680: Added :data:`curses.ncurses_version`.
20509 - bpo-31908: Fix output of cover files for ``trace`` module command-line
20510   tool. Previously emitted cover files only when ``--missing`` option was
20513 - bpo-31608: Raise a ``TypeError`` instead of crashing if a
20514   ``collections.deque`` subclass returns a non-deque from ``__new__``. Patch
20517 - bpo-31425: Add support for sockets of the AF_QIPCRTR address family,
20518   supported by the Linux kernel. This is used to communicate with services,
20522 - bpo-22005: Implemented unpickling instances of
20527 - bpo-27645: :class:`sqlite3.Connection` now exposes a
20529   library is at version 3.6.11 or higher.  Patch by Lele Gaifax.
20531 - bpo-16865: Support arrays >=2GiB in :mod:`ctypes`.  Patch by Segev Finer.
20533 - bpo-31508: Removed support of arguments in
20537 - bpo-29456: Fix bugs in hangul normalization: u1176, u11a7 and u11c3
20540 -------------
20542 - bpo-21257: Document :func:`http.client.parse_headers`.
20544 - bpo-34764: Improve example of iter() with 2nd sentinel argument.
20546 - bpo-35564: Explicitly set master_doc variable in conf.py for compliance
20549 - bpo-35511: Specified that profile.Profile class doesn't not support enable
20551   manager is only supported in cProfile module.
20553 - bpo-10536: Enhance the gettext docs. Patch by Éric Araujo
20555 - bpo-35089: Remove mention of ``typing.io`` and ``typing.re``. Their types
20558 - bpo-35038: Fix the documentation about an unexisting `f_restricted`
20561 - bpo-35042: Replace PEP XYZ by the pep role and allow to use the direct
20564 - bpo-35044: Fix the documentation with the role ``exc`` for the
20567 - bpo-35035: Rename documentation for :mod:`email.utils` to
20570 - bpo-34967: Use app.add_object_type() instead of the deprecated Sphinx
20573 - bpo-34913: Add documentation about the new command line interface of the
20576 - bpo-32174: chm document displays non-ASCII charaters properly on some MBCS
20579 - bpo-11233: Create availability directive for documentation.  Original
20582 - bpo-34790: Document how passing coroutines to asyncio.wait() can be
20585 - bpo-34552: Make clear that ``==`` operator sometimes is equivalent to
20586   `is`. The ``<``, ``<=``, ``>`` and ``>=`` operators are only defined where
20589 - bpo-28617: Fixed info in the stdtypes docs concerning the types that
20592 - bpo-20177: Migrate datetime.date.fromtimestamp to Argument Clinic. Patch
20595 - bpo-34065: Fix wrongly written basicConfig documentation markup syntax
20597 - bpo-33460: replaced ellipsis with correct error codes in tutorial chapter
20600 - bpo-33847: Add '@' operator entry to index.
20602 - bpo-33409: Clarified the relationship between :pep:`538`'s
20605 - bpo-33197: Add versionadded tag to the documentation of
20608 - bpo-17045: Improve the C-API doc for PyTypeObject.  This includes adding
20609   several quick-reference tables and a lot of missing slot/typedef entries.
20613 - bpo-33736: Improve the documentation of :func:`asyncio.open_connection`,
20616 - bpo-23859: Document that `asyncio.wait()` does not cancel its futures on
20619 - bpo-32436: Document :pep:`567` changes to asyncio.
20621 - bpo-33604: Update HMAC md5 default to a DeprecationWarning, bump removal
20624 - bpo-33594: Document ``getargspec``, ``from_function`` and ``from_builtin``
20628 - bpo-33503: Fix broken pypi link
20630 - bpo-33421: Add missing documentation for ``typing.AsyncContextManager``.
20632 - bpo-33487: BZ2file now emit a DeprecationWarning when buffering=None is
20634   state it is deprecated since 3.0.
20636 - bpo-33378: Add Korean language switcher for https://docs.python.org/3/
20638 - bpo-33276: Clarify that the ``__path__`` attribute on modules cannot be
20641 - bpo-33201: Modernize documentation for writing C extension types.
20643 - bpo-33195: Deprecate ``Py_UNICODE`` usage in ``c-api/arg`` document.
20644   ``Py_UNICODE`` related APIs are deprecated since Python 3.3, but it is
20647 - bpo-33126: Document PyBuffer_ToContiguous().
20649 - bpo-27212: Modify documentation for the :func:`islice` recipe to consume
20652 - bpo-28247: Update :mod:`zipapp` documentation to describe how to make
20655 - bpo-18802: Documentation changes for ipaddress.  Patch by Jon Foster and
20658 - bpo-27428: Update documentation to clarify that ``WindowsRegistryFinder``
20661 - bpo-28124: The ssl module function ssl.wrap_socket() has been
20662   de-emphasized and deprecated in favor of the more secure and efficient
20665 - bpo-17232: Clarify docs for -O and -OO.  Patch by Terry Reedy.
20667 - bpo-32436: Add documentation for the contextvars module (PEP 567).
20669 - bpo-32800: Update link to w3c doc for xml default namespaces.
20671 - bpo-11015: Update :mod:`test.support` documentation.
20673 - bpo-32613: Update the faq/windows.html to use the py command from PEP 397
20676 - bpo-8722: Document :meth:`__getattr__` behavior when property :meth:`get`
20679 - bpo-32614: Modify RE examples in documentation to use raw strings to
20683 - bpo-20709: Remove the paragraph where we explain that os.utime() does not
20684   support a directory as path under Windows. Patch by Jan-Philip Gehrcke
20686 - bpo-32722: Remove the bad example in the tutorial of the Generator
20689 - bpo-31972: Improve docstrings for `pathlib.PurePath` subclasses.
20691 - bpo-30607: Use the externalized ``python-docs-theme`` package when
20694 - bpo-8243: Add a note about curses.addch and curses.addstr exception
20697 - bpo-32337: Update documentation related with ``dict`` order.
20699 - bpo-25041: Document ``AF_PACKET`` in the :mod:`socket` module.
20701 - bpo-31432: Clarify meaning of CERT_NONE, CERT_OPTIONAL, and CERT_REQUIRED
20705 -----
20707 - bpo-35772: Fix sparse file tests of test_tarfile on ppc64 with the tmpfs
20710   a file which contains no data. tmpfs effective block size is a page size
20715 - bpo-35045: Make ssl tests less strict and also accept TLSv1 as system
20718 - bpo-32710: ``test_asyncio/test_sendfile.py`` now resets the event loop
20722 - bpo-33717: test.pythoninfo now logs information of all clocks, not only
20725 - bpo-35488: Add a test to pathlib's Path.match() to verify it does not
20726   support glob-style ** recursive pattern matching.
20728 - bpo-31731: Fix a race condition in ``check_interrupted_write()`` of
20731   possible that the thread gets the signal before the signal is blocked.
20733 - bpo-35424: Fix test_multiprocessing_main_handling: use
20737 - bpo-35519: Rename :mod:`test.bisect` module to :mod:`test.bisect_cmd` to
20741 - bpo-35513: Replace :func:`time.time` with :func:`time.monotonic` in tests
20744 - bpo-34279: :func:`test.support.run_unittest` no longer raise
20746   exception is now only raised if no test have been run and no test have
20749 - bpo-35412: Add testcase to ``test_future4``: check unicode literal.
20751 - bpo-26704: Added test demonstrating double-patching of an instance method.
20754 - bpo-33725: test_multiprocessing_fork may crash on recent versions of
20755   macOS.  Until the issue is resolved, skip the test on macOS.
20757 - bpo-35352: Modify test_asyncio to use the certificate set from the test
20760 - bpo-35317: Fix ``mktime()`` overflow error in ``test_email``: run
20764 - bpo-21263: After several reports that test_gdb does not work properly on
20765   macOS and since gdb is not shipped by default anymore, test_gdb is now
20769 - bpo-34279: regrtest issue a warning when no tests have been executed in a
20770   particular test file. Also, a new final result state is issued if no test
20773 - bpo-34962: make docstest in Doc now passes., and is enforced in CI
20775 - bpo-23596: Use argparse for the command line of the gzip module. Patch by
20778 - bpo-34537: Fix ``test_gdb.test_strings()`` when ``LC_ALL=C`` and GDB was
20781 - bpo-34587: test_socket: Remove RDSTest.testCongestion(). The test tries to
20788 - bpo-34661: Fix test_shutil if unzip doesn't support -t.
20790 - bpo-34200: Fixed non-deterministic flakiness of test_pkg by not using the
20794 - bpo-34569: The experimental PEP 554 data channels now correctly pass
20795   negative PyLong objects between subinterpreters on 32-bit systems. Patch
20798 - bpo-34594: Fix usage of hardcoded ``errno`` values in the tests.
20800 - bpo-34579: Fix test_embed for AIX Patch by Michael Felt
20802 - bpo-34542: Use 3072 RSA keys and SHA-256 signature for test certs and
20805 - bpo-11193: Remove special condition for AIX in
20808 - bpo-34347: Fix `test_utf8_mode.test_cmd_line` for AIX
20810 - bpo-34490: On AIX with AF_UNIX family sockets getsockname() does not
20813 - bpo-34391: Fix ftplib test for TLS 1.3 by reading from data socket.
20815 - bpo-11192: Fix `test_socket` on AIX 6.1 and later IPv6 zone id supports
20816   only supported by inet_pton6_zone() Switch to runtime-based
20817   platform.system() to establish current platform  rather than build-time
20820 - bpo-34399: Update all RSA keys and DH params to use at least 2048 bits.
20822 - bpo-34373: Fix ``test_mktime`` and ``test_pthread_getcpuclickid`` tests
20826 - bpo-11191: Skip the distutils test 'test_search_cpp' when using XLC as
20829 - Improved an error message when mock assert_has_calls fails.
20831 - bpo-33746: Fix test_unittest when run in verbose mode.
20833 - bpo-33901: Fix test_dbm_gnu on macOS with gdbm 1.15: add a larger value to
20836 - bpo-33873: Fix a bug in ``regrtest`` that caused an extra test to run if
20837   --huntrleaks/-R was used. Exit with error in case that invalid parameters
20838   are specified to --huntrleaks/-R (at least one warmup run and one
20841 - bpo-33562: Check that a global asyncio event loop policy is not left
20844 - bpo-33655: Ignore test_posix_fallocate failures on BSD platforms that
20847 - bpo-32962: Fixed test_gdb when Python is compiled with flags -mcet
20848   -fcf-protection -O0.
20850 - bpo-33358: Fix ``test_embed.test_pre_initialization_sys_options()`` when
20851   the interpreter is built with ``--enable-shared``.
20853 - bpo-32872: Avoid regrtest compatibility issue with namespace packages.
20855 - bpo-32517: Fix failing ``test_asyncio`` on macOS 10.12.2+ due to transport
20858 - bpo-32663: Making sure the `SMTPUTF8SimTests` class of tests gets run in
20861 - bpo-27643: Test_C test case needs "signed short" bitfields, but the IBM
20865   Applicable to Python2-2.7 and later
20867 - bpo-19417: Add test_bdb.py.
20869 - bpo-31809: Add tests to verify connection with secp ECDH curves.
20872 -----
20874 - bpo-34691: The _contextvars module is now built into the core Python
20877 - bpo-35683: Improved Azure Pipelines build steps and now verifying layouts
20880 - bpo-35642: Remove asynciomodule.c from pythoncore.vcxproj
20882 - bpo-35550: Fix incorrect Solaris #ifdef checks to look for __sun && __SVR4
20885 - bpo-35499: ``make profile-opt`` no longer replaces ``CFLAGS_NODIST`` with
20886   ``CFLAGS``. It now adds profile-guided optimization (PGO) flags to
20889 - bpo-35257: Avoid leaking the linker flags from Link Time Optimizations
20892 - bpo-35351: When building Python with clang and LTO, LTO flags are no
20893   longer passed into CFLAGS to build third-party C extensions through
20896 - bpo-35139: Fix a compiler error when statically linking `pyexpat` in
20899 - bpo-35059: PCbuild: Set InlineFunctionExpansion to OnlyExplicitInline
20904 - bpo-35011: Restores the use of pyexpatns.h to isolate our embedded copy of
20909 - bpo-28015: Have --with-lto works correctly with clang.
20911 - bpo-34765: Update the outdated install-sh file to the latest revision from
20914 - bpo-34585: Check for floating-point byte order in configure.ac using
20916   cross-compiled builds.
20918 - bpo-34710: Fixed SSL module build with OpenSSL & pedantic CFLAGS.
20920 - bpo-34582: Add JUnit XML output for regression tests and update Azure
20923 - bpo-34081: Make Sphinx warnings as errors in the Docs Makefile.
20925 - bpo-34555: Fix for case where it was not possible to have both
20928 - bpo-33015: Fix an undefined behaviour in the pthread implementation of
20932 - bpo-34245: The Python shared library is now installed with write
20933   permission (mode 0755), which is the standard way of installing such
20936 - bpo-34121: Fix detection of C11 atomic support on clang.
20938 - bpo-32430: Rename Modules/Setup.dist to Modules/Setup, and remove the
20942 - bpo-30345: Add -g to LDFLAGS when compiling with LTO to get debug symbols.
20944 - bpo-5755: Move ``-Wstrict-prototypes`` option to ``CFLAGS_NODIST`` from
20948 - bpo-33614: Ensures module definition files for the stable ABI on Windows
20951 - bpo-33648: The --with-c-locale-warning configuration flag has been
20954 - bpo-33522: Enable CI builds on Visual Studio Team Services at
20957 - bpo-33512: configure's check for "long double" has been simplified
20959 - bpo-33483: C compiler is now correctly detected from the standard
20960   environment variables. --without-gcc and --with-icc options have been
20963 - bpo-33394: Enable the verbose build for extension modules, when GNU make
20964   is passed macros on the command line.
20966 - bpo-33393: Update config.guess and config.sub files.
20968 - bpo-33377: Add new triplets for mips r6 and riscv variants (used in
20971 - bpo-32232: By default, modules configured in `Modules/Setup` are no longer
20972   built with `-DPy_BUILD_CORE`. Instead, modules that specifically need that
20975 - bpo-33182: The embedding tests can once again be built with clang 6.0
20977 - bpo-33163: Upgrade pip to 9.0.3 and setuptools to v39.0.1.
20979 - bpo-33012: gcc 8 has added a new warning heuristic to detect invalid
20981   often.  The most common is the cast of a METH_NOARGS function (that uses
20985 - bpo-32898: Fix the python debug build when using COUNT_ALLOCS.
20987 - bpo-29442: Replace optparse with argparse in setup.py
20990 -------
20992 - bpo-35890: Fix API calling consistency of GetVersionEx and wcstok.
20994 - bpo-32560: The ``py`` launcher now forwards its ``STARTUPINFO`` structure
20997 - bpo-35854: Fix EnvBuilder and --symlinks in venv on Windows
20999 - bpo-35811: Avoid propagating venv settings when launching via py.exe
21001 - bpo-35797: Fix default executable used by the multiprocessing module
21003 - bpo-35758: Allow building on ARM with MSVC.
21005 - bpo-29734: Fix handle leaks in os.stat on Windows.
21007 - bpo-35596: Use unchecked PYCs for the embeddable distro to avoid zipimport
21010 - bpo-35596: Fix vcruntime140.dll being added to embeddable distro multiple
21013 - bpo-35402: Update Windows build to use Tcl and Tk 8.6.9
21015 - bpo-35401: Updates Windows build to OpenSSL 1.1.0j
21017 - bpo-34977: venv on Windows will now use a python.exe redirector rather
21020 - bpo-34977: Adds support for building a Windows App Store package
21022 - bpo-35067: Remove _distutils_findvs module and use vswhere.exe instead.
21024 - bpo-32557: Allow shutil.disk_usage to take a file path on Windows
21026 - bpo-34770: Fix a possible null pointer dereference in pyshellext.cpp.
21028 - bpo-34603: Fix returning structs from functions produced by MSVC
21030 - bpo-34581: Guard MSVC-specific code in socketmodule.c with ``#ifdef
21033 - bpo-34532: Fixes exit code of list version arguments for py.exe.
21035 - bpo-34062: Fixed the '--list' and '--list-paths' arguments for the py.exe
21038 - bpo-34225: Ensure INCLUDE and LIB directories do not end with a backslash.
21040 - bpo-34011: A suite of code has been changed which copied across DLLs and
21043   copying code is now only run when that is the case, rather than whenever a
21044   venv is created.
21046 - bpo-34006: Revert line length limit for Windows help docs. The line-length
21047   limit is not needed because the pages appear in a separate app rather than
21050 - bpo-31546: Restore running PyOS_InputHook while waiting for user input at
21054 - bpo-30237: Output error when ReadConsole is canceled by
21057 - bpo-33895: GIL is released while calling functions that acquire Windows
21060 - bpo-33720: Reduces maximum marshal recursion depth on release builds.
21062 - bpo-29097: Fix bug where :meth:`datetime.fromtimestamp` erroneously throws
21066 - bpo-33316: PyThread_release_lock always fails
21068 - bpo-33184: Update Windows installer to use OpenSSL 1.1.0h.
21070 - bpo-32890: Fix usage of GetLastError() instead of errno in os.execve() and
21073 - bpo-33016: Fix potential use of uninitialized memory in
21076 - bpo-32903: Fix a memory leak in os.chdir() on Windows if the current
21077   directory is set to a UNC path.
21079 - bpo-32901: Update Tcl and Tk versions to 8.6.8
21081 - bpo-31966: Fixed WindowsConsoleIO.write() for writing empty data.
21083 - bpo-32409: Ensures activate.bat can handle Unicode contents.
21085 - bpo-32457: Improves handling of denormalized executable path when
21088 - bpo-32370: Use the correct encoding for ipconfig output in the uuid
21091 - bpo-29248: Fix :func:`os.readlink` on Windows, which was mistakenly
21095 - bpo-1104: Correctly handle string length in
21100 -----
21102 - bpo-35401: Update macOS installer to use OpenSSL 1.1.0j.
21104 - bpo-35025: Properly guard the use of the ``CLOCK_GETTIME`` et al. macros
21107 - bpo-24658: On macOS, fix reading from and writing into a file with a size
21110 - bpo-34405: Update to OpenSSL 1.1.0i for macOS installer builds.
21112 - bpo-33635: In macOS stat on some file descriptors (/dev/fd/3 f.e) will
21118 - bpo-13631: The .editrc file in user's home directory is now processed
21122 - bpo-33184: Update macOS installer build to use OpenSSL 1.1.0h.
21124 - bpo-32726: Build and link with private copy of Tcl/Tk 8.6 for the macOS
21127   longer need or use any external versions of Tcl/Tk, either system-provided
21128   or user-installed, such as ActiveTcl.
21130 - bpo-32901: Update macOS 10.9+ installer to Tcl/Tk 8.6.8.
21132 - bpo-31903: In :mod:`_scproxy`, drop the GIL when calling into
21136 ----
21138 - bpo-35770: IDLE macosx deletes Options => Configure IDLE. It previously
21139   deleted Window => Zoom Height by mistake. (Zoom Height is now on the
21140   Options menu).  On Mac, the settings dialog is accessed via Preferences on
21143 - bpo-35769: Change IDLE's new file name from 'Untitled' to 'untitled'
21145 - bpo-35660: Fix imports in idlelib.window.
21147 - bpo-35641: Proper format `calltip` when the function has no docstring.
21149 - bpo-33987: Use ttk Frame for ttk widgets.
21151 - bpo-34055: Fix erroneous 'smart' indents and newlines in IDLE Shell.
21153 - bpo-35591: Find Selection now works when selection not found.
21155 - bpo-35196: Speed up squeezer line counting.
21157 - bpo-35598: Update config_key: use PEP 8 names and ttk widgets, make some
21160 - bpo-28097: Add Previous/Next History entries to Shell menu.
21162 - bpo-35208: Squeezer now properly counts wrapped lines before newlines.
21164 - bpo-35555: Gray out Code Context menu entry when it's not applicable.
21166 - bpo-35521: Document the IDLE editor code context feature. Add some
21169 - bpo-22703: The Code Context menu label now toggles between Show/Hide Code
21173 - bpo-35213: Where appropriate, use 'macOS' in idlelib.
21175 - bpo-34864: On macOS, warn if the system preference "Prefer tabs when
21176   opening documents" is set to "Always".
21178 - bpo-34864: Document two IDLE on MacOS issues. The System Preferences Dock
21182 - bpo-35202: Remove unused imports from lib/idlelib
21184 - bpo-33000: Document that IDLE's shell has no line limit. A program that
21187 - bpo-23220: Explain how IDLE's Shell displays output.
21189 - bpo-35099: Improve the doc about IDLE running user code.   The section is
21190   renamed from "IDLE -- console differences" is renamed "Running user code".
21193 - bpo-35097: Add IDLE doc subsection explaining editor windows. Topics
21196 - bpo-35093: Document the IDLE document viewer in the IDLE doc. Add a
21199 - bpo-35088: Update idlelib.help.copy_string docstring. We now use git and
21202 - bpo-35087: Update idlelib help files for the current doc build. The main
21203   change is the elimination of chapter-section numbers.
21205 - bpo-34548: Use configured color theme for read-only text views.
21207 - bpo-1529353: Enable "squeezing" of long outputs in the shell, to avoid
21212 - bpo-34047: Fixed mousewheel scrolling direction on macOS.
21214 - bpo-34275: Make IDLE calltips always visible on Mac. Some MacOS-tk
21217 - bpo-34120: Fix unresponsiveness after closing certain windows and dialogs.
21219 - bpo-33975: Avoid small type when running htests. Since part of the purpose
21220   of human-viewed tests is to determine that widgets look right, it is
21223 - bpo-33905: Add test for idlelib.stackview.StackBrowser.
21225 - bpo-33924: Change mainmenu.menudefs key 'windows' to 'window'. Every other
21226   menudef key is lowercase version of main menu entry.
21228 - bpo-33906: Rename idlelib.windows as window Match Window on the main menu
21231 - bpo-33917: Fix and document idlelib/idle_test/template.py. The revised
21235 - bpo-33904: IDLE: In rstrip, rename class RstripExtension as Rstrip
21237 - bpo-33907: For consistency and clarity, rename an IDLE module and classes.
21239   module calltip_w, class CallTip is now CalltipWindow.
21241 - bpo-33856: Add "help" in the welcome message of IDLE
21243 - bpo-33839: IDLE: refactor ToolTip and CallTip and add documentation and
21246 - bpo-33855: Minimally test all IDLE modules. Add missing files, import
21249 - bpo-33656: On Windows, add API call saying that tk scales for DPI. On
21254 - bpo-33768: Clicking on a context line moves that line to the top of the
21257 - bpo-33763: IDLE: Use read-only text widget for code context instead of
21260 - bpo-33664: Scroll IDLE editor text by lines. Previously, the mouse wheel
21263   the shell and grep output windows, but not to read-only text views.
21265 - bpo-33679: Enable theme-specific color configuration for Code Context. Use
21266   the Highlights tab to see the setting for built-in themes or add settings
21269 - bpo-33642: Display up to maxlines non-blank lines for Code Context. If
21270   there is no current context, show a single blank line.
21272 - bpo-33628: IDLE: Cleanup codecontext.py and its test.
21274 - bpo-33564: IDLE's code context now recognizes async as a block opener.
21276 - bpo-21474: Update word/identifier definition from ascii to unicode. In
21277   text and entry boxes, this affects selection by double-click, movement
21278   left/right by control-left/right, and deletion left/right by
21279   control-BACKSPACE/DEL.
21281 - bpo-33204: IDLE: consistently color invalid string prefixes. A 'u' string
21283   of the prefix, starting at the right, as is valid. Revise and extend
21286 - bpo-32984: Set ``__file__`` while running a startup file.  Like Python,
21288   presenting the first interactive input prompt.  For IDLE, ``-s`` runs a
21290   :envvar:`PYTHONSTARTUP`; ``-r file`` runs ``file``.  Python sets
21293   without the ``-n`` option.
21295 - bpo-32940: Simplify and rename StringTranslatePseudoMapping in pyparse.
21297 - bpo-32916: Change ``str`` to ``code`` in pyparse.
21299 - bpo-32905: Remove unused code in pyparse module.
21301 - bpo-32874: Add tests for pyparse.
21303 - bpo-32837: Using the system and place-dependent default encoding for
21304   open() is a bad idea for IDLE's system and location-independent files.
21306 - bpo-32826: Add "encoding=utf-8" to open() in IDLE's test_help_about. GUI
21307   test test_file_buttons() only looks at initial ascii-only lines, but
21309   internally reads and decodes far enough ahead to encounter a non-ascii
21312 - bpo-32831: Add docstrings and tests for codecontext.
21314 - bpo-32765: Update configdialog General tab docstring to add new widgets to
21318 -----------
21320 - bpo-35884: Add a benchmark script for timing various ways to access
21323 - bpo-34989: python-gdb.py now handles errors on computing the line number
21326 - bpo-20260: Argument Clinic now has non-bitwise unsigned int converters.
21328 - bpo-32962: python-gdb now catches ``UnicodeDecodeError`` exceptions when
21331 - bpo-32962: python-gdb now catches ValueError on read_var(): when Python
21334 - bpo-33189: :program:`pygettext.py` now recognizes only literal strings as
21336   f-string expressions.
21338 - bpo-31920: Fixed handling directories as arguments in the ``pygettext``
21341 - bpo-29673: Fix pystackv and pystack gdbinit macros.
21343 - bpo-25427: Remove the pyvenv script in favor of ``python3 -m venv`` in
21347 - bpo-32885: Add an ``-n`` flag for ``Tools/scripts/pathfix.py`` to disable
21350 - bpo-32222: Fix pygettext not extracting docstrings for functions with type
21353 - bpo-31583: Fix 2to3 for using with --add-suffix option but without
21354   --output-dir option for relative path to files in current directory.
21357 -----
21359 - bpo-35713: The :c:func:`PyByteArray_Init` and :c:func:`PyByteArray_Fini`
21364 - bpo-33817: Fixed :c:func:`_PyBytes_Resize` for empty bytes objects.
21366 - bpo-35322: Fix memory leak in :c:func:`PyUnicode_EncodeLocale` and
21369 - bpo-35059: The following C macros have been converted to static inline
21374 - bpo-35296: ``make install`` now also installs the internal API:
21377 - bpo-35081: Internal APIs surrounded by ``#ifdef Py_BUILD_CORE`` have been
21381 - bpo-35259: Conditionally declare :c:func:`Py_FinalizeEx()` (new in 3.6)
21384 - bpo-35081: The :c:func:`_PyObject_GC_TRACK` and
21388 - bpo-35134: Creation of a new ``Include/cpython/`` subdirectory.
21390 - bpo-34725: Adds _Py_SetProgramFullPath so embedders may override
21393 - bpo-34910: Ensure that :c:func:`PyObject_Print` always returns ``-1`` on
21396 - bpo-34523: Py_DecodeLocale() and Py_EncodeLocale() now use the UTF-8
21397   encoding on Windows if Py_LegacyWindowsFSEncodingFlag is zero.
21399 - bpo-34193: Fix pluralization in TypeError messages in getargs.c and
21403 - bpo-34127: Return grammatically correct error message based on argument
21406 - bpo-23927: Fixed :exc:`SystemError` in
21407   :c:func:`PyArg_ParseTupleAndKeywords` when the ``w*`` format unit is used
21410 - bpo-32455: Added :c:func:`PyCompile_OpcodeStackEffectWithJump`.
21412 - bpo-34008: Py_Main() can again be called after Py_Initialize(), as in
21415 - bpo-32500: Fixed error messages for :c:func:`PySequence_Size`,
21420 - bpo-33818: :c:func:`PyExceptionClass_Name` will now return ``const char
21423 - bpo-33042: Embedding applications may once again call
21427 - bpo-32374: Document that m_traverse for multi-phase initialized modules
21430 - bpo-30863: :c:func:`PyUnicode_AsWideChar` and
21438 *Release date: 2018-06-27*
21441 -------
21443 - bpo-33851: Fix :func:`ast.get_docstring` for a node that lacks a
21447 -----
21449 - bpo-33932: Calling Py_Initialize() twice does nothing, instead of failing
21456 *Release date: 2018-06-12*
21459 -----------------
21461 - bpo-33803: Fix a crash in hamt.c caused by enabling GC tracking for an
21464 - bpo-33706: Fix a crash in Python initialization when parsing the command
21467 - bpo-30654: Fixed reset of the SIGINT handler to SIG_DFL on interpreter
21471 - bpo-31849: Fix signed/unsigned comparison warning in pyhash.c.
21474 -------
21476 - bpo-30167: Prevent site.main() exception if PYTHONSTARTUP is set. Patch by
21479 - bpo-33812: Datetime instance d with non-None tzinfo, but with
21480   d.tzinfo.utcoffset(d) returning None is now treated as naive by the
21483 - bpo-30805: Avoid race condition with debug logging
21485 - bpo-33694: asyncio: Fix a race condition causing data loss on
21488 - bpo-32493: Correct test for ``uuid_enc_be`` availability in
21491 - bpo-33792: Add asyncio.WindowsSelectorEventLoopPolicy and
21494 - bpo-33778: Update ``unicodedata``'s database to Unicode version 11.0.0.
21496 - bpo-33770: improve base64 exception message for encoded inputs of invalid
21499 - bpo-33769: asyncio/start_tls: Fix error message; cancel callbacks in case
21500   of an unhandled error; mark SSLTransport as closed if it is aborted.
21502 - bpo-33767: The concatenation (``+``) and repetition (``*``) sequence
21506 - bpo-33734: asyncio/ssl: Fix AttributeError, increase default handshake
21509 - bpo-11874: Use a better regex when breaking usage into wrappable parts.
21512 - bpo-33582: Emit a deprecation warning for inspect.formatargspec
21515 -------------
21517 - bpo-33409: Clarified the relationship between :pep:`538`'s
21520 - bpo-33736: Improve the documentation of :func:`asyncio.open_connection`,
21523 - bpo-31432: Clarify meaning of CERT_NONE, CERT_OPTIONAL, and CERT_REQUIRED
21527 -----
21529 - bpo-5755: Move ``-Wstrict-prototypes`` option to ``CFLAGS_NODIST`` from
21534 -------
21536 - bpo-33720: Reduces maximum marshal recursion depth on release builds.
21539 ----
21541 - bpo-33656: On Windows, add API call saying that tk scales for DPI. On
21546 - bpo-33768: Clicking on a context line moves that line to the top of the
21549 - bpo-33763: IDLE: Use read-only text widget for code context instead of
21552 - bpo-33664: Scroll IDLE editor text by lines. Previously, the mouse wheel
21555   the shell and grep output windows, but not to read-only text views.
21557 - bpo-33679: Enable theme-specific color configuration for Code Context. Use
21558   the Highlights tab to see the setting for built-in themes or add settings
21561 - bpo-33642: Display up to maxlines non-blank lines for Code Context. If
21562   there is no current context, show a single blank line.
21568 *Release date: 2018-05-30*
21571 -----------------
21573 - bpo-33622: Fixed a leak when the garbage collector fails to add an object
21576   exception is set and preserves it.
21578 - bpo-33509: Fix module_globals parameter of warnings.warn_explicit(): don't
21579   crash if module_globals is not a dict.
21581 - bpo-20104: The new `os.posix_spawn` added in 3.7.0b1 was removed as we are
21585 - bpo-33475: Fixed miscellaneous bugs in converting annotations to strings
21588 - bpo-33391: Fix a leak in set_symmetric_difference().
21590 - bpo-28055: Fix unaligned accesses in siphash24(). Patch by Rolf Eike Beer.
21592 - bpo-32911: Due to unexpected compatibility issues discovered during
21593   downstream beta testing, reverted :issue:`29463`. ``docstring`` field is
21595   which was added in 3.7a1.  Docstring expression is restored as a first
21598 - bpo-21983: Fix a crash in `ctypes.cast()` in case the type argument is a
21602 -------
21604 - bpo-32751: When cancelling the task due to a timeout,
21605   :meth:`asyncio.wait_for` will now wait until the cancellation is complete.
21607 - bpo-32684: Fix gather to propagate cancellation of itself even with
21610 - bpo-33654: Support protocol type switching in SSLTransport.set_protocol().
21612 - bpo-33674: Pause the transport as early as possible to further reduce the
21615 - bpo-33674: Fix a race condition in SSLProtocol.connection_made() of
21620 - bpo-31647: Fixed bug where calling write_eof() on a
21623 - bpo-32610: Make asyncio.all_tasks() return only pending tasks.
21625 - bpo-32410: Avoid blocking on file IO in sendfile fallback code
21627 - bpo-33469: Fix RuntimeError after closing loop that used run_in_executor
21629 - bpo-33672: Fix Task.__repr__ crash with Cython's bogus coroutines
21631 - bpo-33654: Fix transport.set_protocol() to support switching between
21635 - bpo-33652: Pickles of type variables and subscripted generics are now
21636   future-proof and compatible with older Python versions.
21638 - bpo-32493: Fixed :func:`uuid.uuid1` on FreeBSD.
21640 - bpo-33618: Finalize and document preliminary and experimental TLS 1.3
21643 - bpo-33623: Fix possible SIGSGV when asyncio.Future is created in __del__
21645 - bpo-30877: Fixed a bug in the Python implementation of the JSON decoder
21647   the decoding. Based on patch by c-fos.
21649 - bpo-33570: Change TLS 1.3 cipher suite settings for compatibility with
21650   OpenSSL 1.1.1-pre6 and newer. OpenSSL 1.1.1 will have TLS 1.3 ciphers
21653 - bpo-28556: Do not simplify arguments to `typing.Union`. Now
21654   `Union[Manager, Employee]` is not simplified to `Employee` at runtime.
21658 - bpo-33540: Add a new ``block_on_close`` class attribute to
21661 - bpo-33548: tempfile._candidate_tempdir_list should consider common TEMP
21664 - bpo-33109: argparse subparsers are once again not required by default,
21665   reverting the change in behavior introduced by bpo-26510 in 3.7.0a2.
21667 - bpo-33536: dataclasses.make_dataclass now checks for invalid field names
21671 - bpo-33542: Prevent ``uuid.get_node`` from using a DUID instead of a MAC on
21674 - bpo-26819: Fix race condition with `ReadTransport.resume_reading` in
21677 - Fix failure in `typing.get_type_hints()` when ClassVar was provided as a
21680 - bpo-33505: Optimize asyncio.ensure_future() by reordering if checks: 1.17x
21683 - bpo-33497: Add errors param to cgi.parse_multipart and make an encoding in
21687 - bpo-33495: Change dataclasses.Fields repr to use the repr of each of its
21689   actually represents.  This is especially true for the 'type' member.
21691 - bpo-33453: Fix dataclasses to work if using literal string type
21696 - bpo-28556: Minor fixes in typing module: add annotations to
21700 - bpo-20087: Updated alias mapping with glibc 2.27 supported locales.
21702 - bpo-33422: Fix trailing quotation marks getting deleted when looking up
21705 - bpo-28167: The function ``platform.linux_distribution`` and
21709 - bpo-33197: Update error message when constructing invalid
21710   inspect.Parameters Patch by Dong-hee Na.
21712 - bpo-33263: Fix FD leak in `_SelectorSocketTransport`  Patch by Vlad
21715 - bpo-32861: The urllib.robotparser's ``__str__`` representation now
21716   includes wildcard entries and the "Crawl-delay" and "Request-rate" fields.
21719 - bpo-32257: The ssl module now contains OP_NO_RENEGOTIATION constant,
21722 - bpo-16865: Support arrays >=2GiB in :mod:`ctypes`.  Patch by Segev Finer.
21725 -------------
21727 - bpo-23859: Document that `asyncio.wait()` does not cancel its futures on
21730 - bpo-32436: Document :pep:`567` changes to asyncio.
21732 - bpo-33604: Update HMAC md5 default to a DeprecationWarning, bump removal
21735 - bpo-33503: Fix broken pypi link
21737 - bpo-33421: Add missing documentation for ``typing.AsyncContextManager``.
21740 -----
21742 - bpo-33655: Ignore test_posix_fallocate failures on BSD platforms that
21745 - bpo-32604: Remove the _xxsubinterpreters module (meant for testing) and
21749 -----
21751 - bpo-33614: Ensures module definition files for the stable ABI on Windows
21754 - bpo-33522: Enable CI builds on Visual Studio Team Services at
21757 - bpo-33012: Add ``-Wno-cast-function-type`` for gcc 8 for silencing
21762 -----
21764 - bpo-13631: The .editrc file in user's home directory is now processed
21769 ----
21771 - bpo-33628: IDLE: Cleanup codecontext.py and its test.
21773 - bpo-33564: IDLE's code context now recognizes async as a block opener.
21775 - bpo-32831: Add docstrings and tests for codecontext.
21781 *Release date: 2018-05-02*
21784 -----------------
21786 - bpo-33363: Raise a SyntaxError for ``async with`` and ``async for``
21789 - bpo-33128: Fix a bug that causes PathFinder to appear twice on
21792 - bpo-33312: Fixed clang ubsan (undefined behavior sanitizer) warnings in
21794   keys structure is declared.
21796 - bpo-33231: Fix potential memory leak in ``normalizestring()``.
21798 - bpo-33205: Change dict growth function from
21800   ``round_up_to_power_2(used*3)``.  Previously, dict is shrinked only when
21803 - bpo-29922: Improved error messages in 'async with' when ``__aenter__()``
21804   or ``__aexit__()`` return non-awaitable object.
21806 - bpo-33199: Fix ``ma_version_tag`` in dict implementation is uninitialized
21807   when copying from key-sharing dict.
21810 -------
21812 - bpo-33281: Fix ctypes.util.find_library regression on macOS.
21814 - bpo-33383: Fixed crash in the get() method of the :mod:`dbm.ndbm` database
21815   object when it is called with a single argument.
21817 - bpo-33329: Fix multiprocessing regression on newer glibcs
21819 - bpo-991266: Fix quoting of the ``Comment`` attribute of
21822 - bpo-33131: Upgrade bundled version of pip to 10.0.1.
21824 - bpo-33308: Fixed a crash in the :mod:`parser` module when converting an ST
21828 - bpo-33266: lib2to3 now recognizes ``rf'...'`` strings.
21830 - bpo-11594: Ensure line-endings are respected when using lib2to3.
21832 - bpo-33254: Have :func:`importlib.resources.contents` and
21836 - bpo-33256: Fix display of ``<module>`` call in the html produced by
21839 - bpo-33185: Fixed regression when running pydoc with the :option:`-m`
21844 - bpo-33169: Delete entries of ``None`` in :data:`sys.path_importer_cache`
21845   when :meth:`importlib.machinery.invalidate_caches` is called.
21847 - bpo-33217: Deprecate looking up non-Enum objects in Enum classes and Enum
21850 - bpo-33203: ``random.Random.choice()`` now raises ``IndexError`` for empty
21854 - bpo-33224: Update difflib.mdiff() for :pep:`479`.  Convert an uncaught
21855   StopIteration in a generator into a return-statement.
21857 - bpo-33209: End framing at the end of C implementation of
21860 - bpo-20104: Improved error handling and fixed a reference leak in
21863 - bpo-33175: In dataclasses, Field.__set_name__ now looks up the
21867 - bpo-33097: Raise RuntimeError when ``executor.submit`` is called during
21870 - bpo-31908: Fix output of cover files for ``trace`` module command-line
21871   tool. Previously emitted cover files only when ``--missing`` option was
21875 -------------
21877 - bpo-33378: Add Korean language switcher for https://docs.python.org/3/
21879 - bpo-33276: Clarify that the ``__path__`` attribute on modules cannot be
21882 - bpo-33201: Modernize documentation for writing C extension types.
21884 - bpo-33195: Deprecate ``Py_UNICODE`` usage in ``c-api/arg`` document.
21885   ``Py_UNICODE`` related APIs are deprecated since Python 3.3, but it is
21888 - bpo-8243: Add a note about curses.addch and curses.addstr exception
21891 - bpo-32337: Update documentation related with ``dict`` order.
21894 -----
21896 - bpo-33358: Fix ``test_embed.test_pre_initialization_sys_options()`` when
21897   the interpreter is built with ``--enable-shared``.
21900 -----
21902 - bpo-33394: Enable the verbose build for extension modules, when GNU make
21903   is passed macros on the command line.
21905 - bpo-33393: Update config.guess and config.sub files.
21907 - bpo-33377: Add new triplets for mips r6 and riscv variants (used in
21910 - bpo-32232: By default, modules configured in `Modules/Setup` are no longer
21911   built with `-DPy_BUILD_CORE`. Instead, modules that specifically need that
21914 - bpo-33182: The embedding tests can once again be built with clang 6.0
21917 -------
21919 - bpo-33184: Update Windows installer to use OpenSSL 1.1.0h.
21922 -----
21924 - bpo-33184: Update macOS installer build to use OpenSSL 1.1.0h.
21927 ----
21929 - bpo-21474: Update word/identifier definition from ascii to unicode. In
21930   text and entry boxes, this affects selection by double-click, movement
21931   left/right by control-left/right, and deletion left/right by
21932   control-BACKSPACE/DEL.
21934 - bpo-33204: IDLE: consistently color invalid string prefixes. A 'u' string
21936   of the prefix, starting at the right, as is valid. Revise and extend
21940 -----------
21942 - bpo-33189: :program:`pygettext.py` now recognizes only literal strings as
21944   f-string expressions.
21946 - bpo-31920: Fixed handling directories as arguments in the ``pygettext``
21949 - bpo-29673: Fix pystackv and pystack gdbinit macros.
21951 - bpo-31583: Fix 2to3 for using with --add-suffix option but without
21952   --output-dir option for relative path to files in current directory.
21958 *Release date: 2018-03-29*
21961 --------
21963 - bpo-33136: Harden ssl module against LibreSSL CVE-2018-8970.
21964   X509_VERIFY_PARAM_set1_host() is called with an explicit namelen. A new
21967 - bpo-33001: Minimal fix to prevent buffer overrun in os.symlink on Windows
21969 - bpo-32981: Regexes in difflib and poplib were vulnerable to catastrophic
21971   have been refactored. This resolves CVE-2018-1060 and CVE-2018-1061. Patch
21975 -----------------
21977 - bpo-33053: When using the -m switch, sys.path[0] is now explicitly
21982 - bpo-33018: Improve consistency of errors raised by ``issubclass()`` when
21983   called with a non-class and an abstract base class as the first and second
21986 - bpo-33041: Fixed jumping when the function contains an ``async for`` loop.
21988 - bpo-33026: Fixed jumping out of "with" block by setting f_lineno.
21990 - bpo-33005: Fix a crash on fork when using a custom memory allocator (ex:
21995 - bpo-17288: Prevent jumps from 'return' and 'exception' trace events.
21997 - bpo-32836: Don't use temporary variables in cases of list/dict/set
22001 -------
22003 - bpo-33141: Have Field objects pass through __set_name__ to their default
22006 - bpo-33096: Allow ttk.Treeview.insert to insert iid that has a false
22010 - bpo-32873: Treat type variables and special typing forms as immutable by
22014 - bpo-33134: When computing dataclass's __hash__, use the lookup table to
22015   contain the function which returns the __hash__ value.  This is an
22019 - bpo-33127: The ssl module now compiles with LibreSSL 2.7.1.
22021 - bpo-32505: Raise TypeError if a member variable of a dataclass is of type
22024 - bpo-33078: Fix the failure on OSX caused by the tests relying on
22027 - bpo-33116: Add 'Field' to dataclasses.__all__.
22029 - bpo-32896: Fix an error where subclassing a dataclass with a field that
22032 - bpo-33100: Dataclasses: If a field has a default value that's a
22036 - bpo-32953: If a non-dataclass inherits from a frozen dataclass, allow
22039   hierarchy to be either all frozen or all non-frozen.
22041 - bpo-33061: Add missing ``NoReturn`` to ``__all__`` in typing.py
22043 - bpo-33078: Fix the size handling in multiprocessing.Queue when a pickling
22046 - bpo-33064: lib2to3 now properly supports trailing commas after ``*args``
22049 - bpo-33056: FIX properly close leaking fds in
22052 - bpo-33021: Release the GIL during fstat() calls, avoiding hang of all
22056 - bpo-31804: Avoid failing in multiprocessing.Process if the standard
22059 - bpo-33037: Skip sending/receiving data after SSL transport closing.
22061 - bpo-27683: Fix a regression in :mod:`ipaddress` that result of
22062   :meth:`hosts` is empty when the network is constructed by a tuple
22065 - bpo-32999: Fix C implementation of ``ABC.__subclasscheck__(cls,
22066   subclass)`` crashed when ``subclass`` is not a type object.
22068 - bpo-33009: Fix inspect.signature() for single-parameter partialmethods.
22070 - bpo-32969: Expose several missing constants in zlib and fix corresponding
22073 - bpo-32056: Improved exceptions raised for invalid number of channels and
22077 - bpo-32844: Fix wrong redirection of a low descriptor (0 or 1) to stderr in
22078   subprocess if another low descriptor is closed.
22080 - bpo-32857: In :mod:`tkinter`, ``after_cancel(None)`` now raises a
22084 - bpo-31639: http.server now exposes a ThreadedHTTPServer class and uses it
22085   when the module is run with ``-m`` to cope with web browsers pre-opening
22088 - bpo-27645: :class:`sqlite3.Connection` now exposes a
22090   library is at version 3.6.11 or higher.  Patch by Lele Gaifax.
22093 -------------
22095 - bpo-33126: Document PyBuffer_ToContiguous().
22097 - bpo-27212: Modify documentation for the :func:`islice` recipe to consume
22100 - bpo-28247: Update :mod:`zipapp` documentation to describe how to make
22103 - bpo-18802: Documentation changes for ipaddress.  Patch by Jon Foster and
22106 - bpo-27428: Update documentation to clarify that ``WindowsRegistryFinder``
22110 -----
22112 - bpo-32872: Avoid regrtest compatibility issue with namespace packages.
22114 - bpo-32517: Fix failing ``test_asyncio`` on macOS 10.12.2+ due to transport
22117 - bpo-19417: Add test_bdb.py.
22120 -----
22122 - bpo-33163: Upgrade pip to 9.0.3 and setuptools to v39.0.1.
22125 -------
22127 - bpo-33016: Fix potential use of uninitialized memory in
22130 - bpo-32903: Fix a memory leak in os.chdir() on Windows if the current
22131   directory is set to a UNC path.
22134 -----
22136 - bpo-32726: Build and link with private copy of Tcl/Tk 8.6 for the macOS
22139   longer need or use any external versions of Tcl/Tk, either system-provided
22140   or user-installed, such as ActiveTcl.
22143 ----
22145 - bpo-32984: Set ``__file__`` while running a startup file.  Like Python,
22147   presenting the first interactive input prompt.  For IDLE, ``-s`` runs a
22149   :envvar:`PYTHONSTARTUP`; ``-r file`` runs ``file``.  Python sets
22152   without the ``-n`` option.
22154 - bpo-32940: Simplify and rename StringTranslatePseudoMapping in pyparse.
22157 -----------
22159 - bpo-32885: Add an ``-n`` flag for ``Tools/scripts/pathfix.py`` to disable
22163 -----
22165 - bpo-33042: Embedding applications may once again call
22169 - bpo-32374: Document that m_traverse for multi-phase initialized modules
22176 *Release date: 2018-02-27*
22179 --------
22181 - bpo-28414: The ssl module now allows users to perform their own IDN
22185 -----------------
22187 - bpo-32889: Update Valgrind suppression list to account for the rename of
22190 - bpo-31356: Remove the new API added in bpo-31356 (gc.ensure_disabled()
22193 - bpo-32305: For namespace packages, ensure that both ``__file__`` and
22196 - bpo-32303: Make sure ``__spec__.loader`` matches ``__loader__`` for
22199 - bpo-32711: Fix the warning messages for Python/ast_unparse.c. Patch by
22202 - bpo-32583: Fix possible crashing in builtin Unicode decoders caused by
22203   write out-of-bound errors when using customized decode error handlers.
22206 -------
22208 - bpo-32960: For dataclasses, disallow inheriting frozen from non-frozen
22209   classes, and also disallow inheriting non-frozen from frozen classes. This
22212 - bpo-32713: Fixed tarfile.itn handling of out-of-bounds float values. Patch
22215 - bpo-32951: Direct instantiation of SSLSocket and SSLObject objects is now
22220 - bpo-32929: Remove the tri-state parameter "hash", and add the boolean
22221   "unsafe_hash". If unsafe_hash is True, add a __hash__ function, but if a
22222   __hash__ exists, raise TypeError.  If unsafe_hash is False, add a __hash__
22223   based on the values of eq= and frozen=.  The unsafe_hash=False behavior is
22224   the same as the old hash=None behavior.  unsafe_hash=False is the default,
22227 - bpo-32947: Add OP_ENABLE_MIDDLEBOX_COMPAT and test workaround for TLSv1.3
22230 - bpo-30622: The ssl module now detects missing NPN support in LibreSSL.
22232 - bpo-32922: dbm.open() now encodes filename with the filesystem encoding
22235 - bpo-32859: In ``os.dup2``, don't check every call whether the ``dup3``
22238 - bpo-32556: nt._getfinalpathname, nt._getvolumepathname and
22241 - bpo-25988: Emit a :exc:`DeprecationWarning` when using or importing an ABC
22244 - bpo-21060: Rewrite confusing message from setup.py upload from "No dist
22248 - bpo-32852: Make sure sys.argv remains as a list when running trace.
22250 - bpo-31333: ``_abc`` module is added.  It is a speedup module with C
22253   subclass are up to 1.5x faster. In addition, this makes Python start-up up
22260 - bpo-32841: Fixed `asyncio.Condition` issue which silently ignored
22264 - bpo-32819: ssl.match_hostname() has been simplified and no longer depends
22268 - bpo-32394: socket: Remove
22270   Windows during run-time.
22272 - bpo-31787: Fixed refleaks of ``__init__()`` methods in various modules.
22275 - bpo-30157: Fixed guessing quote and delimiter in csv.Sniffer.sniff() when
22276   only the last field is quoted.  Patch by Jake Davis.
22278 - bpo-32792: collections.ChainMap() preserves the order of the underlying
22281 - bpo-32775: :func:`fnmatch.translate()` no longer produces patterns which
22282   contain set operations. Sets starting with '[' or containing '--', '&&',
22287 - bpo-32622: Implement native fast sendfile for Windows proactor event loop.
22289 - bpo-32777: Fix a rare but potential pre-exec child process deadlock in
22294 - bpo-32647: The ctypes module used to depend on indirect linking for
22295   dlopen. The shared extension is now explicitly linked against libdl on
22298 - bpo-32741: Implement ``asyncio.TimerHandle.when()`` method.
22300 - bpo-32691: Use mod_spec.parent when running modules with pdb
22302 - bpo-32734: Fixed ``asyncio.Lock()`` safety issue which allowed acquiring
22306 - bpo-32727: Do not include name field in SMTP envelope from address. Patch
22309 - bpo-31453: Add TLSVersion constants and SSLContext.maximum_version /
22314 - bpo-24334: Internal implementation details of ssl module were cleaned up.
22319 - bpo-31848: Fix the error handling in Aifc_read.initfp() when the SSND
22320   chunk is not found. Patch by Zackery Spytz.
22322 - bpo-32585: Add Ttk spinbox widget to :mod:`tkinter.ttk`.  Patch by Alan D
22325 - bpo-32221: Various functions returning tuple containing IPv6 addresses now
22326   omit ``%scope`` part since the same information is already encoded in
22329   interface name is omitted.
22331 - bpo-30693: The TarFile class now recurses directories in a reproducible
22334 - bpo-30693: The ZipFile class now recurses directories in a reproducible
22338 -------------
22340 - bpo-28124: The ssl module function ssl.wrap_socket() has been
22341   de-emphasized and deprecated in favor of the more secure and efficient
22344 - bpo-17232: Clarify docs for -O and -OO.  Patch by Terry Reedy.
22346 - bpo-32436: Add documentation for the contextvars module (PEP 567).
22348 - bpo-32800: Update link to w3c doc for xml default namespaces.
22350 - bpo-11015: Update :mod:`test.support` documentation.
22352 - bpo-8722: Document :meth:`__getattr__` behavior when property :meth:`get`
22355 - bpo-32614: Modify RE examples in documentation to use raw strings to
22359 - bpo-31972: Improve docstrings for `pathlib.PurePath` subclasses.
22362 -----
22364 - bpo-31809: Add tests to verify connection with secp ECDH curves.
22367 -----
22369 - bpo-32898: Fix the python debug build when using COUNT_ALLOCS.
22372 -------
22374 - bpo-32901: Update Tcl and Tk versions to 8.6.8
22376 - bpo-31966: Fixed WindowsConsoleIO.write() for writing empty data.
22378 - bpo-32409: Ensures activate.bat can handle Unicode contents.
22380 - bpo-32457: Improves handling of denormalized executable path when
22383 - bpo-32370: Use the correct encoding for ipconfig output in the uuid
22386 - bpo-29248: Fix :func:`os.readlink` on Windows, which was mistakenly
22391 -----
22393 - bpo-32901: Update macOS 10.9+ installer to Tcl/Tk 8.6.8.
22396 ----
22398 - bpo-32916: Change ``str`` to ``code`` in pyparse.
22400 - bpo-32905: Remove unused code in pyparse module.
22402 - bpo-32874: Add tests for pyparse.
22404 - bpo-32837: Using the system and place-dependent default encoding for
22405   open() is a bad idea for IDLE's system and location-independent files.
22407 - bpo-32826: Add "encoding=utf-8" to open() in IDLE's test_help_about. GUI
22408   test test_file_buttons() only looks at initial ascii-only lines, but
22410   internally reads and decodes far enough ahead to encounter a non-ascii
22413 - bpo-32765: Update configdialog General tab docstring to add new widgets to
22417 -----------
22419 - bpo-32222: Fix pygettext not extracting docstrings for functions with type
22426 *Release date: 2018-01-30*
22429 -----------------
22431 - bpo-32703: Fix coroutine's ResourceWarning when there's an active error
22434 - bpo-32650: Pdb and other debuggers dependent on bdb.py will correctly step
22437 - bpo-28685: Optimize list.sort() and sorted() by using type specialized
22440 - bpo-32685: Improve suggestion when the Python 2 form of print statement is
22442   else terminated by a semi-colon instead of a newline. Patch by Nitish
22445 - bpo-32697: Python now explicitly preserves the definition order of
22446   keyword-only parameters.  It's always preserved their order, but this
22447   behavior was never guaranteed before; this behavior is now guaranteed and
22450 - bpo-32690: The locals() dictionary now displays in the lexical order that
22453 - bpo-32677: Add ``.isascii()`` method to ``str``, ``bytes`` and
22457 - bpo-32670: Enforce :pep:`479` for all code. This means that manually
22458   raising a StopIteration exception from a generator is prohibited for all
22462 - bpo-32591: Added built-in support for tracking the origin of coroutine
22467 - bpo-31368: Expose preadv and pwritev system calls in the os module. Patch
22470 - bpo-32544: ``hasattr(obj, name)`` and ``getattr(obj, name, default)`` are
22471   about 4 times faster than before when ``name`` is not found and ``obj``
22474 - bpo-26163: Improved frozenset() hash to create more distinct hash values
22477 - bpo-32550: Remove the STORE_ANNOTATION bytecode.
22479 - bpo-20104: Expose posix_spawn as a low level API in the os module.
22482 - bpo-24340: Fixed estimation of the code stack size.
22484 - bpo-32436: Implement :pep:`567` Context Variables.
22486 - bpo-18533: ``repr()`` on a dict containing its own ``values()`` or
22491 - bpo-20891: Py_Initialize() now creates the GIL. The GIL is no longer
22492   created "on demand" to fix a race condition when PyGILState_Ensure() is
22493   called in a non-Python thread.
22495 - bpo-32028: Leading whitespace is now correctly ignored when generating
22499 - bpo-31179: Make dict.copy() up to 5.5 times faster.
22501 - bpo-31113: Get rid of recursion in the compiler for normal control flow.
22504 -------
22506 - bpo-25988: Deprecate exposing the contents of collections.abc in the
22509 - bpo-31429: The default cipher suite selection of the ssl module now uses a
22510   blacklist approach rather than a hard-coded whitelist. Python no longer
22511   re-enables ciphers that have been blocked by OpenSSL security update.
22514 - bpo-30306: contextlib.contextmanager now releases the arguments passed to
22515   the underlying generator as soon as the context manager is entered.
22520 - bpo-21417: Added support for setting the compression level for
22523 - bpo-32251: Implement asyncio.BufferedProtocol (provisional API).
22525 - bpo-32513: In dataclasses, allow easier overriding of dunder methods
22528 - bpo-32660: :mod:`termios` makes available ``FIONREAD``, ``FIONCLEX``,
22531 - bpo-27931: Fix email address header parsing error when the username is an
22534 - bpo-32659: Under Solaris and derivatives, :class:`os.stat_result` provides
22537 - bpo-32662: Implement Server.start_serving(), Server.serve_forever(), and
22541 - bpo-32391: Implement :meth:`asyncio.StreamWriter.wait_closed` and
22544 - bpo-32643: Make Task._step, Task._wakeup and Future._schedule_callbacks
22547 - bpo-32630: Refactor decimal module to use contextvars to store decimal
22550 - bpo-32622: Add :meth:`asyncio.AbstractEventLoop.sendfile` method.
22552 - bpo-32304: distutils' upload command no longer corrupts tar files ending
22556 - bpo-32502: uuid.uuid1 no longer raises an exception if a 64-bit hardware
22557   address is encountered.
22559 - bpo-32596: ``concurrent.futures`` imports ``ThreadPoolExecutor`` and
22564 - bpo-31801: Add ``_ignore_`` to ``Enum`` so temporary variables can be used
22567 - bpo-32576: Use queue.SimpleQueue() in places where it can be invoked from
22570 - bpo-32574: Fix memory leak in asyncio.Queue, when the queue has limited
22571   size and it is full, the cancelation of queue.put() can cause a memory
22574 - bpo-32521: The nis module is now compatible with new libnsl and headers
22577 - bpo-32467: collections.abc.ValuesView now inherits from
22580 - bpo-32473: Improve ABCMeta._dump_registry() output readability
22582 - bpo-32102: New argument ``capture_output`` for subprocess.run
22584 - bpo-32521: glibc has removed Sun RPC. Use replacement libtirpc headers and
22587 - bpo-32493: UUID module fixes build for FreeBSD/OpenBSD
22589 - bpo-32503: Pickling with protocol 4 no longer creates too small frames.
22591 - bpo-29237: Create enum for pstats sorting options
22593 - bpo-32454: Add close(fd) function to the socket module.
22595 - bpo-25942: The subprocess module is now more graceful when handling a
22596   Ctrl-C KeyboardInterrupt during subprocess.call, subprocess.run, or a
22602 - bpo-32433: The hmac module now has hmac.digest(), which provides an
22605 - bpo-28134: Sockets now auto-detect family, type and protocol from file
22608 - bpo-32404: Fix bug where :meth:`datetime.datetime.fromtimestamp` did not
22611 - bpo-32403: Improved speed of :class:`datetime.date` and
22614 - bpo-32228: Ensure that ``truncate()`` preserves the file position (as
22617 - bpo-32410: Implement ``loop.sock_sendfile`` for asyncio event loop.
22619 - bpo-22908: Added seek and tell to the ZipExtFile class. This only works if
22620   the file object used to open the zipfile is seekable.
22622 - bpo-32373: Add socket.getblocking() method.
22624 - bpo-32248: Add :mod:`importlib.resources` and
22628   File-based and zipimport-based loaders both implement these APIs.
22629   :class:`importlib.abc.ResourceLoader` is deprecated in favor of these new
22632 - bpo-32320: collections.namedtuple() now supports default values.
22634 - bpo-29302: Add contextlib.AsyncExitStack. Patch by Alexander Mohr and Ilya
22637 - bpo-31961: *Removed in Python 3.7.0b2.* The *args* argument of
22638   subprocess.Popen can now be a :term:`path-like object`. If *args* is given
22639   as a sequence, it's first element can now be a :term:`path-like object` as
22642 - bpo-31900: The :func:`locale.localeconv` function now sets temporarily the
22644   ``decimal_point`` and ``thousands_sep`` byte strings if they are non-ASCII
22645   or longer than 1 byte, and the ``LC_NUMERIC`` locale is different than the
22651 - bpo-31853: Use super().method instead of socket.method in SSLSocket.  They
22654 - bpo-31399: The ssl module now uses OpenSSL's X509_VERIFY_PARAM_set1_host()
22659 - bpo-14976: Add a queue.SimpleQueue class, an unbounded FIFO queue with a
22663 -------------
22665 - bpo-32724: Add references to some commands in the documentation of Pdb.
22668 - bpo-32649: Complete the C API documentation, profiling and tracing part
22669   with the newly added per-opcode events.
22671 - bpo-17799: Explain real behaviour of sys.settrace and sys.setprofile and
22672   their C-API counterparts regarding which type of events are received in
22676 -----
22678 - bpo-32721: Fix test_hashlib to not fail if the _md5 module is not built.
22680 - bpo-28414: Add test cases for IDNA 2003 and 2008 host names. IDNA 2003
22681   internationalized host names are working since bpo-31399 has landed. IDNA
22684 - bpo-32604: Add a new "_xxsubinterpreters" extension module that exposes
22685   the existing subinterpreter C-API and a new cross-interpreter data sharing
22686   mechanism. The module is primarily intended for more thorough testing of
22690 - bpo-32602: Add test certs and test for ECDSA cert and EC/RSA dual mode.
22692 - bpo-32549: On Travis CI, Python now Compiles and uses a local copy of
22696 -----
22698 - bpo-32635: Fix segfault of the crypt module when libxcrypt is provided
22701 - bpo-32598: Use autoconf to detect OpenSSL libs, headers and supported
22702   features. The ax_check_openssl M4 macro uses pkg-config to locate OpenSSL
22705 - bpo-32593: Drop support of FreeBSD 9 and older.
22707 - bpo-29708: If the :envvar:`SOURCE_DATE_EPOCH` environment variable is set,
22708   :mod:`py_compile` will always create hash-based ``.pyc`` files.
22711 -------
22713 - bpo-32588: Create standalone _distutils_findvs module and add missing
22716 - bpo-29911: Ensure separate Modify and Uninstall buttons are displayed.
22718 - bpo-32507: Use app-local UCRT install rather than the proper update for
22722 -----
22724 - bpo-32726: Provide an additional, more modern macOS installer variant that
22725   supports macOS 10.9+ systems in 64-bit mode only.  Upgrade the supplied
22726   third-party libraries to OpenSSL 1.1.0g and to SQLite 3.22.0.  The 10.9+
22729 - bpo-28440: No longer add /Library/Python/3.x/site-packages to sys.path for
22733 -----
22735 - bpo-32681: Fix uninitialized variable 'res' in the C implementation of
22738 - bpo-10381: Add C API access to the ``datetime.timezone`` constructor and
22745 *Release date: 2018-01-08*
22748 -----------------
22750 - bpo-31975: The default warning filter list now starts with a
22752   once again shown by default in single-file scripts and at the interactive
22755 - bpo-32226: ``__class_getitem__`` is now an automatic class method.
22757 - bpo-32399: Add AIX uuid library support for RFC4122 using uuid_create() in
22760 - bpo-32390: Fix the compilation failure on AIX after the f_fsid field has
22764 - bpo-32379: Make MRO computation faster when a class inherits from a single
22767 - bpo-32259: The error message of a TypeError raised when unpack
22768   non-iterable is now more specific.
22770 - bpo-27169: The ``__debug__`` constant is now optimized out at compile
22771   time. This fixes also bpo-22091.
22773 - bpo-32329: The :option:`-R` option now turns on hash randomization when
22774   the :envvar:`PYTHONHASHSEED` environment variable is set to ``0``.
22776   ``sys.flags.hash_randomization`` is now properly set to 0 when hash
22777   randomization is turned off by ``PYTHONHASHSEED=0``.
22779 - bpo-30416: The optimizer is now protected from spending much time doing
22784 - bpo-32282: Fix an unnecessary ifdef in the include of VersionHelpers.h in
22787 - bpo-30579: Implement TracebackType.__new__ to allow Python-level creation
22790 - bpo-32260: Don't byte swap the input keys to the SipHash algorithm on
22791   big-endian platforms. This should ensure siphash gives consistent results
22794 - bpo-31506: Improve the error message logic for object.__new__ and
22797 - bpo-20361: ``-b`` and ``-bb`` now inject ``'default::BytesWarning'`` and
22800   ``-W`` option or the ``PYTHONWARNINGS`` environment variable.
22802 - bpo-32230: `-X dev` now injects a ``'default'`` entry into
22804   ``-Wdefault`` at the command line.
22806 - bpo-29240: Add a new UTF-8 mode: implementation of the :pep:`540`.
22808 - bpo-32226: :pep:`560`: Add support for ``__mro_entries__`` and
22811 - bpo-32225: :pep:`562`: Add support for module ``__getattr__`` and
22814 - bpo-31901: The `atexit` module now has its callback stored per
22817 - bpo-31650: Implement :pep:`552` (Deterministic pycs). Python now supports
22819   than source last-modified time.
22821 - bpo-29469: Move constant folding from bytecode layer to AST layer.
22825 -------
22827 - bpo-32506: Now that dict is defined as keeping insertion order, drop
22830 - bpo-32279: Add params to dataclasses.make_dataclasses(): init, repr, eq,
22833 - bpo-32278: Make type information optional on dataclasses.make_dataclass().
22834   If omitted, the string 'typing.Any' is used.
22836 - bpo-32499: Add dataclasses.is_dataclass(obj), which returns True if obj is
22839 - bpo-32468: Improve frame repr() to mention filename, code name and current
22842 - bpo-23749: asyncio: Implement loop.start_tls()
22844 - bpo-32441: Return the new file descriptor (i.e., the second argument) from
22847 - bpo-32422: ``functools.lru_cache`` uses less memory (3 words for each
22850 - bpo-31721: Prevent Python crash from happening when Future._log_traceback
22851   is set to True manually.  Now it can only be set to False, or a ValueError
22852   is raised.
22854 - bpo-32415: asyncio: Add Task.get_loop() and Future.get_loop()
22856 - bpo-26133: Don't unsubscribe signals in asyncio UNIX event loop on
22859 - bpo-32363: Make asyncio.Task.set_exception() and set_result() raise
22864 - bpo-32357: Optimize asyncio.iscoroutine() and loop.create_task() for
22865   non-native coroutines (e.g. async/await compiled with Cython).
22867   'loop.create_task(cython_coroutine)'.  Now, the latter is as fast.
22869 - bpo-32356: asyncio.transport.resume_reading() and pause_reading() are now
22870   idempotent. New transport.is_reading() method is added.
22872 - bpo-32355: Optimize asyncio.gather(); now up to 15% faster.
22874 - bpo-32351: Use fastpath in asyncio.sleep if delay<0 (2x boost)
22876 - bpo-32348: Optimize asyncio.Future schedule/add/remove callback.  The
22877   optimization shows 3-6% performance improvements of async/await code.
22879 - bpo-32331: Fix socket.settimeout() and socket.setblocking() to keep
22880   socket.type as is. Fix socket.socket() constructor to reset any bit flags
22884 - bpo-32248: Add :class:`importlib.abc.ResourceReader` as an ABC for loaders
22889 - bpo-32311: Implement asyncio.create_task(coro) shortcut
22891 - bpo-32327: Convert asyncio functions that were documented as coroutines to
22895 - bpo-32323: :func:`urllib.parse.urlsplit()` does not convert zone-id
22898 - bpo-32302: Fix bdist_wininst of distutils for CRT v142: it binary
22901 - bpo-29711: Fix ``stop_serving`` in asyncio proactor loop kill all
22904 - bpo-32308: :func:`re.sub()` now replaces empty matches adjacent to a
22905   previous non-empty match.
22907 - bpo-29970: Abort asyncio SSLProtocol connection if handshake not complete
22910 - bpo-32314: Implement asyncio.run().
22912 - bpo-17852: Revert incorrect fix based on misunderstanding of
22915 - bpo-32296: Implement asyncio._get_running_loop() and get_event_loop() in
22918 - bpo-32250: Implement ``asyncio.current_task()`` and
22924 - bpo-32255: A single empty field is now always quoted when written into a
22928 - bpo-32277: Raise ``NotImplementedError`` instead of ``SystemError`` on
22929   platforms where ``chmod(..., follow_symlinks=False)`` is not supported.
22932 - bpo-30050: New argument warn_on_full_buffer to signal.set_wakeup_fd lets
22936 - bpo-29137: The ``fpectl`` library has been removed. It was never enabled
22937   by default, never worked correctly on x86-64, and it changed the Python
22940 - bpo-32273: Move asyncio.test_utils to test.test_asyncio.
22942 - bpo-32272: Remove asyncio.async() function.
22944 - bpo-32269: Add asyncio.get_running_loop() function.
22946 - bpo-32265: All class and static methods of builtin types now are correctly
22951 - bpo-32253: Deprecate ``yield from lock``, ``await lock``, ``with (yield
22955 - bpo-22589: Changed MIME type of .bmp from 'image/x-ms-bmp' to 'image/bmp'
22957 - bpo-32193: Convert asyncio to use *async/await* syntax. Old styled ``yield
22958   from`` is still supported too.
22960 - bpo-32206: Add support to run modules with pdb
22962 - bpo-32227: ``functools.singledispatch`` now supports registering
22965 - bpo-15873: Added new alternate constructors
22971 - bpo-32199: The getnode() ip getter now uses 'ip link' instead of 'ip link
22974 - bpo-32143: os.statvfs() includes the f_fsid field from statvfs(2)
22976 - bpo-26439: Fix ctypes.util.find_library() for AIX by implementing
22979 - bpo-31993: The pickler now uses less memory when serializing large bytes
22983 - bpo-27456: Ensure TCP_NODELAY is set on Linux. Tests by Victor Stinner.
22985 - bpo-31778: ast.literal_eval() is now more strict. Addition and subtraction
22988 - bpo-31802: Importing native path module (``posixpath``, ``ntpath``) now
22989   works even if the ``os`` module still is not imported.
22991 - bpo-30241: Add contextlib.AbstractAsyncContextManager. Patch by Jelle
22994 - bpo-31699: Fix deadlocks in
22999 - bpo-15216: ``TextIOWrapper.reconfigure()`` supports changing *encoding*,
23003 -------------
23005 - bpo-32418: Add get_loop() method to Server and AbstractServer classes.
23008 -----
23010 - bpo-32252: Fix faulthandler_suppress_crash_report() used to prevent core
23013 - bpo-32002: Adjust C locale coercion testing for the empty locale and POSIX
23017 -------
23019 - bpo-19764: Implement support for `subprocess.Popen(close_fds=True)` on
23023 -----------
23025 - bpo-24960: 2to3 and lib2to3 can now read pickled grammar files using
23030 -----
23032 - bpo-32030: Py_Initialize() doesn't reset the memory allocators to default
23033   if the ``PYTHONMALLOC`` environment variable is not set.
23035 - bpo-29084: Undocumented C API for OrderedDict has been excluded from the
23039 - bpo-32264: Moved the pygetopt.h header into internal/, since it has no
23042 - bpo-32241: :c:func:`Py_SetProgramName` and :c:func:`Py_SetPythonHome` now
23049 *Release date: 2017-12-05*
23052 -----------------
23054 - bpo-32176: co_flags.CO_NOFREE is now always set correctly by the code
23060 - bpo-10544: Yield expressions are now deprecated in comprehensions and
23062   outermost iterable, as that is evaluated directly in the enclosing scope.
23064 - bpo-32137: The repr of deeply nested dict now raises a RecursionError
23067 - bpo-32096: Revert memory allocator changes in the C API: move structures
23072 - bpo-32043: Add a new "developer mode": new "-X dev" command line option to
23075 - bpo-32023: SyntaxError is now correctly raised when a generator expression
23076   without parenthesis is used instead of an inheritance list in a class
23080 - bpo-32012: SyntaxError is now correctly raised when a generator expression
23081   without parenthesis is passed as an argument, but followed by a trailing
23085 - bpo-28180: A new internal ``_Py_SetLocaleFromEnv(category)`` helper
23090 - bpo-31949: Fixed several issues in printing tracebacks
23098 - bpo-30696: Fix the interactive interpreter looping endlessly when no
23101 - bpo-20047: Bytearray methods partition() and rpartition() now accept only
23102   bytes-like objects as separator, as documented.  In particular they now
23103   raise TypeError rather of returning a bogus result when an integer is
23106 - bpo-21720: BytesWarning no longer emitted when the *fromlist* argument of
23110 - bpo-31845: Environment variables are once more read correctly at
23113 - bpo-28936: Ensure that lexically first syntax error involving a parameter
23114   and ``global`` or ``nonlocal`` is detected first at a given scope. Patch
23117 - bpo-31825: Fixed OverflowError in the 'unicode-escape' codec and in
23118   codecs.escape_decode() when decode an escaped non-ascii byte.
23120 - bpo-31618: The per-frame tracing logic added in 3.7a1 has been altered so
23121   that ``frame->f_lineno`` is updated before either ``"line"`` or
23128 - bpo-28603: Print the full context/cause chain of exceptions on interpreter
23129   exit, even if an exception in the chain is unhashable or compares equal to
23132 - bpo-31786: Fix timeout rounding in the select module to round correctly
23133   negative timeouts between -1.0 and 0.0. The functions now block waiting
23134   for events as expected. Previously, the call was incorrectly non-blocking.
23137 - bpo-31781: Prevent crashes when calling methods of an uninitialized
23140 - bpo-30399: Standard repr() of BaseException with a single argument no
23143 - bpo-31626: Fixed a bug in debug memory allocator.  There was a write to
23146 - bpo-30817: `PyErr_PrintEx()` clears now the ignored exception that may be
23150 -------
23152 - bpo-28556: Two minor fixes for ``typing`` module: allow shallow copying
23156 - bpo-32214: PEP 557, Data Classes. Provides a decorator which adds
23160 - bpo-27240: The header folding algorithm for the new email policies has
23161   been rewritten, which also fixes bpo-30788, bpo-31831, and bpo-32182.  In
23162   particular, RFC2231 folding is now done correctly.
23164 - bpo-32186: io.FileIO.readall() and io.FileIO.read() now release the GIL
23168 - bpo-32101: Add :attr:`sys.flags.dev_mode` flag
23170 - bpo-32154: The ``asyncio.windows_utils.socketpair()`` function has been
23171   removed: use directly :func:`socket.socketpair` which is available on all
23176 - bpo-32089: warnings: In development (-X dev) and debug mode (pydebug
23180 - bpo-32107: ``uuid.getnode()`` now preferentially returns universally
23184   addresses are available, the first such one found is returned.
23186 - bpo-23033: Wildcard is now supported in hostname when it is one and only
23187   character in the left most segment of hostname in second argument of
23190 - bpo-12239: Make :meth:`msilib.SummaryInformation.GetProperty` return
23191   ``None`` when the value of property is ``VT_EMPTY``.  Initial patch by
23194 - bpo-28334: Use :func:`os.path.expanduser` to find the ``~/.netrc`` file in
23195   :class:`netrc.netrc`.  If it does not exist, :exc:`FileNotFoundError` is
23198 - bpo-32121: Made ``tracemalloc.Traceback`` behave more like the traceback
23205 - bpo-31325: Fix wrong usage of :func:`collections.namedtuple` in the
23209 - bpo-12382: :func:`msilib.OpenDatabase` now raises a better exception
23213 - bpo-19610: ``setup()`` now warns about invalid types for some fields. The
23218 - bpo-32071: Added the ``-k`` command-line option to ``python -m unittest``
23221 - bpo-10049: Added *nullcontext* no-op context manager to contextlib. This
23225 - bpo-28684: The new test.support.skip_unless_bind_unix_socket() decorator
23226   is used here to skip asyncio tests that fail because the platform lacks a
23227   functional bind() function for unix domain sockets (as it is the case for
23231 - bpo-32110: ``codecs.StreamReader.read(n)`` now returns not more than *n*
23232   characters/bytes for non-negative *n*. This makes it compatible with
23233   ``read()`` methods of other file-like objects.
23235 - bpo-27535: The warnings module doesn't leak memory anymore in the hidden
23240 - bpo-32088: warnings:  When Python is build is debug mode (``Py_DEBUG``),
23244 - bpo-1647489: Fixed searching regular expression patterns that could match
23245   an empty string. Non-empty string can now be correctly found after
23248 - bpo-25054: Added support of splitting on a pattern that could match an
23251 - bpo-32072: Fixed issues with binary plists: Fixed saving bytearrays.
23256 - bpo-32069: Drop legacy SSL transport from asyncio, ssl.MemoryBIO is always
23259 - bpo-32066: asyncio: Support pathlib.Path in create_unix_connection; sock
23262 - bpo-32046: Updates 2to3 to convert from operator.isCallable(obj) to
23263   callable(obj). Patch by Dong-hee Na.
23265 - bpo-32018: inspect.signature should follow :pep:`8`, if the parameter has
23266   an annotation and a default value. Patch by Dong-hee Na.
23268 - bpo-32025: Add time.thread_time() and time.thread_time_ns()
23270 - bpo-32037: Integers that fit in a signed 32-bit integer will be now
23275 - bpo-32034: Make asyncio.IncompleteReadError and LimitOverrunError
23278 - bpo-32015: Fixed the looping of asyncio in the case of reconnection the
23281 - bpo-32011: Restored support of loading marshal files with the TYPE_INT64
23284 - bpo-28369: Enhance add_reader/writer check that socket is not used by some
23286   int FD were supported.  Now the check is implemented correctly for all
23287   file-like objects.
23289 - bpo-31976: Fix race condition when flushing a file is slow, which can
23292 - bpo-31985: Formally deprecated aifc.openfp, sunau.openfp, and wave.openfp.
23298 - bpo-21862: cProfile command line now accepts `-m module_name` as an
23301 - bpo-31970: Reduce performance overhead of asyncio debug mode.
23303 - bpo-31843: *database* argument of sqlite3.connect() now accepts a
23304   :term:`path-like object`, instead of just a string.
23306 - bpo-31945: Add Configurable *blocksize* to ``HTTPConnection`` and
23309 - bpo-31943: Add a ``cancelled()`` method to :class:`asyncio.Handle`.  Patch
23312 - bpo-9678: Fixed determining the MAC address in the uuid module: Using
23316 - bpo-30057: Fix potential missed signal in signal.signal().
23318 - bpo-31933: Fix Blake2 params leaf_size and node_offset on big endian
23321 - bpo-21423: Add an initializer argument to {Process,Thread}PoolExecutor
23323 - bpo-31927: Fixed compilation of the socket module on NetBSD 8.  Fixed
23327 - bpo-27666: Fixed stack corruption in curses.box() and curses.ungetmouse()
23328   when the size of types chtype or mmask_t is less than the size of C long.
23332 - bpo-31917: Add 3 new clock identifiers: :data:`time.CLOCK_BOOTTIME`,
23335 - bpo-31897: plistlib now catches more errors when read binary plists and
23338 - bpo-25720: Fix the method for checking pad state of curses WINDOW. Patch
23341 - bpo-31893: Fixed the layout of the kqueue_event structure on OpenBSD and
23344 - bpo-31891: Fixed building the curses module on NetBSD.
23346 - bpo-31884: added required constants to subprocess module for setting
23349 - bpo-28281: Remove year (1-9999) limits on the Calendar.weekday() function.
23352 - bpo-31702: crypt.mksalt() now allows to specify the number of rounds for
23353   SHA-256 and SHA-512 hashing.
23355 - bpo-30639: :func:`inspect.getfile` no longer computes the repr of unknown
23359 - bpo-30768: Fix the pthread+semaphore implementation of
23361   intr_flag=0: recompute the timeout if sem_timedwait() is interrupted by a
23364 - bpo-31854: Add ``mmap.ACCESS_DEFAULT`` constant.
23366 - bpo-31834: Use optimized code for BLAKE2 only with SSSE3+. The pure SSE2
23367   implementation is slower than the pure C reference implementation.
23369 - bpo-28292: Calendar.itermonthdates() will now consistently raise an
23370   exception when a date falls outside of the 0001-01-01 through 9999-12-31
23376 - bpo-28564: The shutil.rmtree() function has been sped up to 20--40%. This
23379 - bpo-28416: Instances of pickle.Pickler subclass with the persistent_id()
23383 - bpo-31653: Don't release the GIL if we can acquire a multiprocessing
23386 - bpo-28326: Fix multiprocessing.Process when stdout and/or stderr is closed
23389 - bpo-20825: Add `subnet_of` and `superset_of` containment tests to
23393 - bpo-31827: Remove the os.stat_float_times() function. It was introduced in
23397 - bpo-31756: Add a ``subprocess.Popen(text=False)`` keyword argument to
23401 - bpo-31819: Add AbstractEventLoop.sock_recv_into().
23403 - bpo-31457: If nested log adapters are used, the inner ``process()``
23406 - bpo-31457: The ``manager`` property on LoggerAdapter objects is now
23409 - bpo-31806: Fix timeout rounding in time.sleep(), threading.Lock.acquire()
23411   between -1.0 and 0.0. The functions now block waiting for events as
23412   expected. Previously, the call was incorrectly non-blocking. Patch by
23415 - bpo-31803: time.clock() and time.get_clock_info('clock') now emit a
23418 - bpo-31800: Extended support for parsing UTC offsets. strptime '%z' can now
23422 - bpo-28603: traceback: Fix a TypeError that occurred during printing of
23424   its context/cause chain is unhashable. Patch by Zane Bitter.
23426 - bpo-30541: Add new function to seal a mock and prevent the automatically
23429 - bpo-31784: Implement the :pep:`564`, add new 6 new functions with
23435 - bpo-30143: 2to3 now generates a code that uses abstract collection classes
23438 - bpo-31770: Prevent a crash when calling the ``__init__()`` method of a
23441 - bpo-31764: Prevent a crash in ``sqlite3.Cursor.close()`` in case the
23442   ``Cursor`` object is uninitialized. Patch by Oren Milman.
23444 - bpo-31752: Fix possible crash in timedelta constructor called with custom
23447 - bpo-31620: an empty asyncio.Queue now doesn't leak memory when queue.get
23450 - bpo-31690: Allow the flags re.ASCII, re.LOCALE, and re.UNICODE to be used
23453 - bpo-30349: FutureWarning is now emitted if a regular expression contains
23457 - bpo-31664: Added support for the Blowfish hashing in the crypt module.
23459 - bpo-31632: Fix method set_protocol() of class _SSLProtocolTransport in
23463 - bpo-15037: Added a workaround for getkey() in curses for ncurses 5.7 and
23466 - bpo-31307: Allow use of bytes objects for arguments to
23469 - bpo-31334: Fix ``poll.poll([timeout])`` in the ``select`` module for
23471   non-negative integer or -1. Patch by Riccardo Coccioli.
23473 - bpo-31310: multiprocessing's semaphore tracker should be launched again if
23476 - bpo-31308: Make multiprocessing's forkserver process immune to Ctrl-C and
23479 - bpo-31245: Added support for AF_UNIX socket in asyncio
23482 - bpo-30553: Add HTTP/2 status code 421 (Misdirected Request) to
23486 -------------
23488 - bpo-32105: Added asyncio.BaseEventLoop.connect_accepted_socket
23492 -----
23494 - bpo-31380: Skip test_httpservers test_undecodable_file on macOS: fails on
23497 - bpo-31705: Skip test_socket.test_sha256() on Linux kernel older than 4.5.
23501 - bpo-32138: Skip on Android test_faulthandler tests that raise SIGSEGV and
23504 - bpo-32136: The runtime embedding tests have been split out from
23507 - bpo-28668: test.support.requires_multiprocessing_queue is removed. Skip
23509   instead when the semaphore implementation is broken or missing.
23511 - bpo-32126: Skip test_get_event_loop_new_process in
23512   test.test_asyncio.test_events when sem_open() is not functional.
23514 - bpo-31174: Fix test_tools.test_unparse: DirectoryTestCase now stores the
23519 -----
23521 - bpo-28538: Revert the previous changes, the if_nameindex structure is
23524 - bpo-28762: Revert the last commit, the F_LOCK macro is defined by Android
23527 - bpo-29040: Support building Android with Unified Headers. The first NDK
23528   release to support Unified Headers is android-ndk-r14.
23530 - bpo-32059: ``detect_modules()`` in ``setup.py`` now also searches the
23531   sysroot paths when cross-compiling.
23533 - bpo-31957: Fixes Windows SDK version detection when building for Windows.
23535 - bpo-31609: Fixes quotes in PCbuild/clean.bat
23537 - bpo-31934: Abort the build when building out of a not clean source tree.
23539 - bpo-31926: Fixed Argument Clinic sometimes causing compilation errors when
23543 - bpo-28791: Update Windows builds to use SQLite 3.21.0.
23545 - bpo-28791: Update OS X installer to use SQLite 3.21.0.
23547 - bpo-28643: Record profile-opt build progress with stamp files.
23549 - bpo-31866: Finish removing support for AtheOS.
23552 -------
23554 - bpo-1102: Return ``None`` when ``View.Fetch()`` returns
23558 - bpo-31944: Fixes Modify button in Apps and Features dialog.
23560 - bpo-20486: Implement the ``Database.Close()`` method to help closing MSI
23563 - bpo-31857: Make the behavior of USE_STACKCHECK deterministic in a
23564   multi-threaded environment.
23567 -----
23569 - bpo-31392: Update macOS installer to use OpenSSL 1.0.2m
23572 ----
23574 - bpo-32207: Improve tk event exception tracebacks in IDLE. When tk event
23575   handling is driven by IDLE's run loop, a confusing and distracting
23576   queue.EMPTY traceback context is no longer added to tk event exception
23577   tracebacks.  The traceback is now the same as when event handling is
23580 - bpo-32164: Delete unused file idlelib/tabbedpages.py. Use of TabbedPageSet
23583 - bpo-32100: IDLE: Fix old and new bugs in pathbrowser; improve tests. Patch
23586 - bpo-31858: IDLE -- Restrict shell prompt manipulation to the shell. Editor
23588   the code and fixes a minor bug when newline is inserted. Sys.ps1, if
23589   present, is read on Shell start-up, but is not set or changed.
23591 - bpo-31860: The font sample in the IDLE configuration dialog is now
23594 - bpo-31836: Test_code_module now passes if run after test_idle, which sets
23598 - bpo-28603: Fix a TypeError that caused a shell restart when printing a
23599   traceback that includes an exception that is unhashable. Patch by Zane
23602 - bpo-13802: Use non-Latin characters in the IDLE's Font settings sample.
23605   character. The expanded example give users of non-Latin characters a
23607   room for the expanded sample, frames on the Font tab are re-arranged.  The
23611 -----------
23613 - bpo-32159: Remove CVS and Subversion tools: remove svneol.py and
23618 - bpo-30722: Make redemo work with Python 3.6 and newer versions. Also,
23623 -----
23625 - bpo-20891: Fix PyGILState_Ensure(). When PyGILState_Ensure() is called in
23626   a non-Python thread before PyEval_InitThreads(), only call
23629 - bpo-32125: The ``Py_UseClassExceptionsFlag`` flag has been removed. It was
23632 - bpo-25612: Move the current exception state from the frame object to the
23633   co-routine. This simplifies the interpreter and fixes a couple of obscure
23637 - bpo-23699: Add Py_RETURN_RICHCOMPARE macro to reduce boilerplate code in
23640 - bpo-30697: The `PyExc_RecursionErrorInst` singleton is removed and
23641   `PyErr_NormalizeException()` does not use it anymore. This singleton is
23649 *Release date: 2017-10-16*
23652 -----------------
23654 - bpo-31558: ``gc.freeze()`` is a new API that allows for moving all objects
23658   this enables great copy-on-write stability at fork().
23660 - bpo-31642: Restored blocking "from package import module" by setting
23663 - bpo-31708: Allow use of asynchronous generator expressions in synchronous
23666 - bpo-31709: Drop support of asynchronous __aiter__.
23668 - bpo-30404: The -u option now makes the stdout and stderr streams
23669   unbuffered rather than line-buffered.
23671 - bpo-31619: Fixed a ValueError when convert a string with large number of
23674 - bpo-31602: Fix an assertion failure in `zipimporter.get_source()` in case
23677 - bpo-31592: Fixed an assertion failure in Python parser in case of a bad
23680 - bpo-31588: Raise a `TypeError` with a helpful error message when class
23684 - bpo-31574: Importlib was instrumented with two dtrace probes to profile
23687 - bpo-31566: Fix an assertion failure in `_warnings.warn()` in case of a bad
23690 - bpo-31506: Improved the error message logic for object.__new__ and
23693 - bpo-31505: Fix an assertion failure in `json`, in case
23697 - bpo-31492: Fix assertion failures in case of failing to import from a
23701 - bpo-31478: Fix an assertion failure in `_random.Random.seed()` in case the
23704 - bpo-31336: Speed up class creation by 10-20% by reducing the overhead in
23707 - bpo-31415: Add ``-X importtime`` option to show how long each import
23711 - bpo-31410: Optimized calling wrapper and classmethod descriptors.
23713 - bpo-31353: :pep:`553` - Add a new built-in called ``breakpoint()`` which
23716   call whatever debugger they want.  The original value of the hook is saved
23719 - bpo-17852: Maintain a list of open buffered files, flush them before
23722 - bpo-31315: Fix an assertion failure in imp.create_dynamic(), when
23723   spec.name is not a string. Patch by Oren Milman.
23725 - bpo-31311: Fix a crash in the ``__setstate__()`` method of
23728 - bpo-31293: Fix crashes in true division and multiplication of a timedelta
23732 - bpo-31285: Fix an assertion failure in `warnings.warn_explicit`, when the
23736 - bpo-30406: Make ``async`` and ``await`` proper keywords, as specified in
23740 -------
23742 - bpo-30058: Fixed buffer overflow in select.kqueue.control().
23744 - bpo-31672: ``idpattern`` in ``string.Template`` matched some non-ASCII
23745   characters. Now it uses ``-i`` regular expression local flag to avoid
23746   non-ASCII characters.
23748 - bpo-31701: On Windows, faulthandler.enable() now ignores MSC and COM
23751 - bpo-31728: Prevent crashes in `_elementtree` due to unsafe cleanup of
23754 - bpo-31671: Now ``re.compile()`` converts passed RegexFlag to normal int
23758 - bpo-30397: The types of compiled regular objects and match objects are now
23762 - bpo-31675: Fixed memory leaks in Tkinter's methods splitlist() and split()
23765 - bpo-31673: Fixed typo in the name of Tkinter's method adderrorinfo().
23767 - bpo-31648: Improvements to path predicates in ElementTree: Allow
23772 - bpo-30806: Fix the string representation of a netrc object.
23774 - bpo-31638: Add optional argument ``compressed`` to
23775   ``zipapp.create_archive``, and add option ``--compress`` to the command
23778 - bpo-25351: Avoid venv activate failures with undefined variables
23780 - bpo-20519: Avoid ctypes use (if possible) and improve import time for
23783 - bpo-28293: The regular expression cache is no longer completely dumped
23784   when it is full.
23786 - bpo-31596: Added pthread_getcpuclockid() to the time module
23788 - bpo-27494: Make 2to3 accept a trailing comma in generator expressions. For
23789   example, ``set(x for x in [],)`` is now allowed.
23791 - bpo-30347: Stop crashes when concurrently iterate over itertools.groupby()
23794 - bpo-30346: An iterator produced by itertools.groupby() iterator now
23797 - bpo-31556: Cancel asyncio.wait_for future faster if timeout <= 0
23799 - bpo-31540: Allow passing a context object in
23804 - bpo-31516: ``threading.current_thread()`` should not return a dummy thread
23807 - bpo-31525: In the sqlite module, require the sqlite3_prepare_v2 API. Thus,
23810 - bpo-26510: argparse subparsers are now required by default.  This matches
23816 - bpo-27541: Reprs of subclasses of some collection and iterator classes
23821 - bpo-31351: python -m ensurepip now exits with non-zero exit code if pip
23824 - bpo-31389: ``pdb.set_trace()`` now takes an optional keyword-only argument
23825   ``header``. If given, this is printed to the console just before debugging
23829 -------------
23831 - bpo-31537: Fix incorrect usage of ``get_history_length`` in readline
23834 - bpo-30085: The operator functions without double underscores are preferred
23836   back-compatibility.
23839 -----
23841 - bpo-31696: Improve compiler version information in :data:`sys.version`
23842   when Python is built with Clang.
23844 - bpo-31625: Stop using ranlib on static libraries. Instead, we assume ar
23847 - bpo-31624: Remove support for BSD/OS.
23849 - bpo-22140: Prevent double substitution of prefix in python-config.sh.
23851 - bpo-31569: Correct PCBuild/ case to PCbuild/ in build scripts and
23854 - bpo-31536: Avoid wholesale rebuild after `make regen-all` if nothing
23858 ----
23860 - bpo-31460: Simplify the API of IDLE's Module Browser. Passing a widget
23862   browser frame that is only part of a window.  Passing a full file name
23866 - bpo-31649: IDLE - Make _htest, _utest parameters keyword only.
23868 - bpo-31559: Remove test order dependence in idle_test.test_browser.
23870 - bpo-31459: Rename IDLE's module browser from Class Browser to Module
23871   Browser. The original module-level class and method browser became a
23872   module browser, with the addition of module-level functions, years ago.
23874   back-compatibility, the virtual event <<open-class-browser>>, which
23875   appears on the Keys tab of the Settings dialog, is not changed. Patch by
23878 - bpo-31500: Default fonts now are scaled on HiDPI displays.
23880 - bpo-1612262: IDLE module browser now shows nested classes and functions.
23885 -----
23887 - bpo-28280: Make `PyMapping_Keys()`, `PyMapping_Values()` and
23891 - bpo-31532: Fix memory corruption due to allocator mix in getpath.c between
23894 - bpo-25658: Implement :pep:`539` for Thread Specific Storage (TSS) API: it
23895   is a new Thread Local Storage (TLS) API to CPython which would supersede
23904 *Release date: 2017-09-19*
23907 --------
23909 - bpo-29781: SSLObject.version() now correctly returns None when handshake
23912 - bpo-29505: Add fuzz tests for float(str), int(str), unicode(str); for
23913   oss-fuzz.
23915 - bpo-30947: Upgrade libexpat embedded copy from version 2.2.1 to 2.2.3 to
23918 - bpo-30730: Prevent environment variables injection in subprocess on
23922 - bpo-30694: Upgrade expat copy from 2.2.0 to 2.2.1 to get fixes of multiple
23923   security vulnerabilities including: CVE-2017-9233 (External entity
23924   infinite loop DoS), CVE-2016-9063 (Integer overflow, re-fix),
23925   CVE-2016-0718 (Fix regression bugs from 2.2.0's fix to CVE-2016-0718) and
23926   CVE-2012-0876 (Counter hash flooding with SipHash). Note: the
23927   CVE-2016-5300 (Use os-specific entropy sources like getrandom) doesn't
23931 - bpo-30500: Fix urllib.parse.splithost() to correctly parse fragments. For
23936 - bpo-29591: Update expat copy from 2.1.1 to 2.2.0 to get fixes of
23937   CVE-2016-0718 and CVE-2016-4472. See
23941 -----------------
23943 - bpo-31490: Fix an assertion failure in `ctypes` class definition, in case
23944   the class has an attribute whose name is specified in ``_anonymous_`` but
23947 - bpo-31471: Fix an assertion failure in `subprocess.Popen()` on Windows, in
23950 - bpo-31418: Fix an assertion failure in `PyErr_WriteUnraisable()` in case
23953 - bpo-31416: Fix assertion failures in case of a bad warnings.filters or
23956 - bpo-28411: Change direct usage of PyInterpreterState.modules to
23961 - bpo-28411: Switch to the abstract API when dealing with
23966 - bpo-31411: Raise a TypeError instead of SystemError in case
23967   warnings.onceregistry is not a dictionary. Patch by Oren Milman.
23969 - bpo-31344: For finer control of tracing behaviour when testing the
23972   default) to turn off per-line trace events; and ``f_trace_opcodes``
23973   (``False`` by default) to turn on per-opcode trace events.
23975 - bpo-31373: Fix several possible instances of undefined behavior due to
23976   floating-point demotions.
23978 - bpo-30465: Location information (``lineno`` and ``col_offset``) in
23979   f-strings is now (mostly) correct.  This fixes tools like flake8 from
23982 - bpo-30860: Consolidate CPython's global runtime state under a single
23985 - bpo-31347: Fix possible undefined behavior in _PyObject_FastCall_Prepend.
23987 - bpo-31343: Include sys/sysmacros.h for major(), minor(), and makedev().
23990 - bpo-31291: Fix an assertion failure in `zipimport.zipimporter.get_data` on
23994 - bpo-31271: Fix an assertion failure in the write() method of
23998 - bpo-31243: Fix a crash in some methods of `io.TextIOWrapper`, when the
23999   decoder's state is invalid. Patch by Oren Milman.
24001 - bpo-30721: ``print`` now shows correct usage hint for using Python 2
24004 - bpo-31070: Fix a race condition in importlib _get_module_lock().
24006 - bpo-30747: Add a non-dummy implementation of _Py_atomic_store and
24009 - bpo-31095: Fix potential crash during GC caused by ``tp_dealloc`` which
24012 - bpo-31071: Avoid masking original TypeError in call with * unpacking when
24015 - bpo-30978: str.format_map() now passes key lookup exceptions through.
24018 - bpo-30808: Use _Py_atomic API for concurrency-sensitive signal state.
24020 - bpo-30876: Relative import from unloaded package now reimports the package
24021   instead of failing with SystemError.  Relative import from non-package now
24024 - bpo-30703: Improve signal delivery. Avoid using Py_AddPendingCall from
24025   signal handler, to avoid calling signal-unsafe functions. The tests I'm
24029 - bpo-30765: Avoid blocking in pthread_mutex_lock() when
24030   PyThread_acquire_lock() is asked not to block.
24032 - bpo-31161: Make sure the 'Missing parentheses' syntax error message is
24035 - bpo-30814: Fixed a race condition when import a submodule from a package.
24037 - bpo-30736: The internal unicodedata database has been upgraded to Unicode
24040 - bpo-30604: Move co_extra_freefuncs from per-thread to per-interpreter to
24043 - bpo-30597: ``print`` now shows expected input in custom error message when
24046 - bpo-30682: Removed a too-strict assertion that failed for certain
24047   f-strings, such as eval("f'\\\n'") and eval("f'\\\r'").
24049 - bpo-30501: The compiler now produces more optimal code for complex
24053 - bpo-28180: Implement :pep:`538` (legacy C locale coercion). This means
24054   that when a suitable coercion target locale is available, both the core
24055   interpreter and locale-aware C extensions will assume the use of UTF-8 as
24058 - bpo-30486: Allows setting cell values for __closure__. Patch by Lisa
24061 - bpo-30537: itertools.islice now accepts integer-like objects (having an
24064 - bpo-25324: Tokens needed for parsing in Python moved to C. ``COMMENT``,
24068 - bpo-29104: Fixed parsing backslashes in f-strings.
24070 - bpo-27945: Fixed various segfaults with dict when input collections are
24074 - bpo-25794: Fixed type.__setattr__() and type.__delattr__() for
24075   non-interned attribute names.  Based on patch by Eryk Sun.
24077 - bpo-30039: If a KeyboardInterrupt happens when the interpreter is in the
24081 - bpo-28974: ``object.__format__(x, '')`` is now equivalent to ``str(x)``
24084 - bpo-30024: Circular imports involving absolute imports with binding a
24087 - bpo-12414: sys.getsizeof() on a code object now returns the sizes which
24089   by Dong-hee Na.
24091 - bpo-29839: len() now raises ValueError rather than OverflowError if
24094 - bpo-11913: README.rst is now included in the list of distutils standard
24097 - bpo-29914: Fixed default implementations of __reduce__ and
24101 - bpo-29949: Fix memory usage regression of set and frozenset object.
24103 - bpo-29935: Fixed error messages in the index() method of tuple, list and
24106 - bpo-29816: Shift operation now has less opportunity to raise
24107   OverflowError. ValueError always is raised rather than OverflowError for
24108   negative counts. Shifting zero with non-negative count always returns
24111 - bpo-24821: Fixed the slowing down to 25 times in the searching of some
24114 - bpo-29102: Add a unique ID to PyInterpreterState.  This makes it easier to
24117 - bpo-29894: The deprecation warning is emitted if __complex__ returns an
24121 - bpo-29859: Show correct error messages when any of the pthread_* calls in
24124 - bpo-29849: Fix a memory leak when an ImportError is raised during from
24127 - bpo-28856: Fix an oversight that %b format for bytes should support
24130 - bpo-29723: The ``sys.path[0]`` initialization change for bpo-29139 caused
24131   a regression by revealing an inconsistency in how sys.path is initialized
24138 - bpo-29568: Escaped percent "%%" in the format string for classic string
24141 - bpo-29714: Fix a regression that bytes format may fail when containing
24144 - bpo-29695: bool(), float(), list() and tuple() no longer take keyword
24148 - bpo-28893: Set correct __cause__ for errors about invalid awaitables
24151 - bpo-28876: ``bool(range)`` works even if ``len(range)`` raises
24154 - bpo-29683: Fixes to memory allocation in _PyCode_SetExtra.  Patch by Brian
24157 - bpo-29684: Fix minor regression of PyEval_CallObjectWithKeywords. It
24158   should raise TypeError when kwargs is not a dict.  But it might cause segv
24159   when args=NULL and kwargs is not a dict.
24161 - bpo-28598: Support __rmod__ for subclasses of str being called before
24164 - bpo-29607: Fix stack_effect computation for CALL_FUNCTION_EX. Patch by
24167 - bpo-29602: Fix incorrect handling of signed zeros in complex constructor
24171 - bpo-29347: Fixed possibly dereferencing undefined pointers when creating
24174 - bpo-29463: Add ``docstring`` field to Module, ClassDef, FunctionDef, and
24175   AsyncFunctionDef ast nodes.  docstring is not first stmt in their body
24179 - bpo-29438: Fixed use-after-free problem in key sharing dict.
24181 - bpo-29546: Set the 'path' and 'name' attribute on ImportError for ``from
24184 - bpo-29546: Improve from-import error message with location
24186 - bpo-29478: If max_line_length=None is specified while using the Compat32
24187   policy, it is no longer ignored.  Patch by Mircea Cosbuc.
24189 - bpo-29319: Prevent RunMainFromImporter overwriting sys.path[0].
24191 - bpo-29337: Fixed possible BytesWarning when compare the code objects.
24194 - bpo-29327: Fixed a crash when pass the iterable keyword argument to
24197 - bpo-29034: Fix memory leak and use-after-free in os module
24200 - bpo-29159: Fix regression in bytes(x) when x.__index__() raises Exception.
24202 - bpo-29049: Call _PyObject_GC_TRACK() lazily when calling Python function.
24203   Calling function is up to 5% faster.
24205 - bpo-28927: bytes.fromhex() and bytearray.fromhex() now ignore all ASCII
24208 - bpo-28932: Do not include <sys/random.h> if it does not exist.
24210 - bpo-25677: Correct the positioning of the syntax error caret for indented
24213 - bpo-29000: Fixed bytes formatting of octals with zero padding in alternate
24216 - bpo-18896: Python function can now have more than 255 parameters.
24219 - bpo-28596: The preferred encoding is UTF-8 on Android. Patch written by
24222 - bpo-22257: Clean up interpreter startup (see :pep:`432`).
24224 - bpo-26919: On Android, operating system data is now always encoded/decoded
24225   to/from UTF-8, instead of the locale encoding to avoid inconsistencies
24226   with os.fsencode() and os.fsdecode() which are already using UTF-8.
24228 - bpo-28991: functools.lru_cache() was susceptible to an obscure reentrancy
24229   bug triggerable by a monkey-patched len() function.
24231 - bpo-28147: Fix a memory leak in split-table dictionaries: setattr() must
24234 - bpo-28739: f-string expressions are no longer accepted as docstrings and
24237 - bpo-28512: Fixed setting the offset attribute of SyntaxError by
24240 - bpo-28918: Fix the cross compilation of xxlimited when Python has been
24243 - bpo-23722: Rather than silently producing a class that doesn't support
24244   zero-argument ``super()`` in methods, failing to pass the new
24246   ``DeprecationWarning`` and a class that supports zero-argument
24249 - bpo-28797: Modifying the class __dict__ inside the __set_name__ method of
24250   a descriptor that is used inside that class no longer prevents calling the
24253 - bpo-28799: Remove the ``PyEval_GetCallStats()`` function and deprecate the
24258 - bpo-12844: More than 255 arguments can now be passed to a function.
24260 - bpo-28782: Fix a bug in the implementation ``yield from`` when checking if
24261   the next instruction is YIELD_FROM. Regression introduced by WORDCODE
24264 - bpo-28774: Fix error position of the unicode error in ASCII and Latin1
24266   non-encodable characters (non-ASCII for the ASCII codec, characters out of
24267   the U+0000-U+00FF range for Latin1).
24269 - bpo-28731: Optimize _PyDict_NewPresized() to create correct size dict.
24272 - bpo-28532: Show sys.version when -V option is supplied twice.
24274 - bpo-27100: The with-statement now checks for __enter__ before it checks
24278 - bpo-28746: Fix the set_inheritable() file descriptor method on platforms
24281 - bpo-26920: Fix not getting the locale's charset upon initializing the
24284 - bpo-28648: Fixed crash in Py_DecodeLocale() in debug build on Mac OS X
24287 - bpo-28665: Improve speed of the STORE_DEREF opcode by 40%.
24289 - bpo-19398: Extra slash no longer added to sys.path components in case of
24290   empty compile-time PYTHONPATH components.
24292 - bpo-28621: Sped up converting int to float by reusing faster bits counting
24295 - bpo-28580: Optimize iterating split table values. Patch by Xiang Zhang.
24297 - bpo-28583: PyDict_SetDefault didn't combine split table when needed. Patch
24300 - bpo-28128: Deprecation warning for invalid str and byte escape sequences
24304 - bpo-28509: dict.update() no longer allocate unnecessary large memory.
24306 - bpo-28426: Fixed potential crash in PyUnicode_AsDecodedObject() in debug
24309 - bpo-28517: Fixed of-by-one error in the peephole optimizer that caused
24312 - bpo-28214: Improved exception reporting for problematic __set_name__
24315 - bpo-23782: Fixed possible memory leak in _PyTraceback_Add() and exception
24318 - bpo-28183: Optimize and cleanup dict iteration.
24320 - bpo-26081: Added C implementation of asyncio.Future. Original patch by
24323 - bpo-28379: Added sanity checks and tests for PyUnicode_CopyCharacters().
24326 - bpo-28376: The type of long range iterator is now registered as Iterator.
24329 - bpo-28376: Creating instances of range_iterator by calling range_iterator
24330   type now is disallowed.  Calling iter() on range instance is the only way.
24333 - bpo-26906: Resolving special methods of uninitialized type now causes
24336 - bpo-18287: PyType_Ready() now checks that tp_name is not NULL. Original
24339 - bpo-24098: Fixed possible crash when AST is changed in process of
24342 - bpo-28201: Dict reduces possibility of 2nd conflict in hash table when
24345 - bpo-28350: String constants with null character no longer interned.
24347 - bpo-26617: Fix crash when GC runs during weakref callbacks.
24349 - bpo-27942: String constants now interned recursively in tuples and
24352 - bpo-28289: ImportError.__init__ now resets not specified attributes.
24354 - bpo-21578: Fixed misleading error message when ImportError called with
24357 - bpo-28203: Fix incorrect type in complex(1.0, {2:3}) error message. Patch
24360 - bpo-28086: Single var-positional argument of tuple subtype was passed
24361   unscathed to the C-defined function.  Now it is converted to exact tuple.
24363 - bpo-28214: Now __set_name__ is looked up on the class instead of the
24366 - bpo-27955: Fallback on reading /dev/urandom device when the getrandom()
24369 - bpo-28192: Don't import readline in isolated mode.
24371 - bpo-27441: Remove some redundant assignments to ob_size in longobject.c.
24374 - bpo-27222: Clean up redundant code in long_rshift function. Thanks Oren
24377 - Upgrade internal unicode databases to Unicode version 9.0.0.
24379 - bpo-28131: Fix a regression in zipimport's compile_source().  zipimport
24382 - bpo-28126: Replace Py_MEMCPY with memcpy(). Visual Studio can properly
24385 - bpo-28120: Fix dict.pop() for splitted dictionary when trying to remove a
24386   "pending key" (Not yet inserted in split-table). Patch by Xiang Zhang.
24388 - bpo-26182: Raise DeprecationWarning when async and await keywords are used
24391 - bpo-26182: Fix a refleak in code that raises DeprecationWarning.
24393 - bpo-28721: Fix asynchronous generators aclose() and athrow() to handle
24396 - bpo-26110: Speed-up method calls: add LOAD_METHOD and CALL_METHOD opcodes.
24399 -------
24401 - bpo-31499: xml.etree: Fix a crash when a parser is part of a reference
24404 - bpo-31482: ``random.seed()`` now works with bytes in version=1
24406 - bpo-28556: typing.get_type_hints now finds the right globalns for classes
24409 - bpo-28556: Speed improvements to the ``typing`` module.  Original PRs by
24412 - bpo-31544: The C accelerator module of ElementTree ignored exceptions
24415 - bpo-31234: socket.create_connection() now fixes manually a reference
24418 - bpo-31457: LoggerAdapter objects can now be nested.
24420 - bpo-31431: SSLContext.check_hostname now automatically sets
24424 - bpo-31233: socketserver.ThreadingMixIn now keeps a list of non-daemonic
24427 - bpo-28638: Changed the implementation strategy for
24433   depending on how it is measured), and 3) minor speed-ups for instance
24435   contributor is Jelle Zijlstra with further improvements by INADA Naoki,
24438 - bpo-31400: Improves SSL error handling to avoid losing error numbers.
24440 - bpo-27629: Make return types of SSLContext.wrap_bio() and
24443 - bpo-28958: ssl.SSLContext() now uses OpenSSL error information when a
24446 - bpo-28182: The SSL module now raises SSLCertVerificationError when OpenSSL
24450 - bpo-27340: SSLSocket.sendall() now uses memoryview to create slices of
24451   data. This fixes support for all bytes-like object. It is also more
24454 - bpo-14191: A new function
24459 - bpo-31178: Fix string concatenation bug in rare error path in the
24462 - bpo-31350: Micro-optimize :func:`asyncio._get_running_loop` to become up
24465 - bpo-31170: expat: Update libexpat from 2.2.3 to 2.2.4. Fix copying of
24466   partial characters for UTF-8 input (libexpat bug 115):
24469 - bpo-29136: Add TLS 1.3 cipher suites and OP_NO_TLSv1_3.
24471 - bpo-1198569: ``string.Template`` subclasses can optionally define
24476 - bpo-31326: concurrent.futures.ProcessPoolExecutor.shutdown() now
24480 - bpo-27144: The ``map()`` and ``as_completed()`` iterators in
24483 - bpo-31281: Fix ``fileinput.FileInput(files, inplace=True)`` when ``files``
24486 - bpo-10746: Fix ctypes producing wrong :pep:`3118` type codes for integer
24489 - bpo-27584: ``AF_VSOCK`` has been added to the socket interface which
24492 - bpo-22536: The subprocess module now sets the filename when
24493   FileNotFoundError is raised on POSIX systems due to the executable or cwd
24496 - bpo-29741: Update some methods in the _pyio module to also accept integer
24499 - bpo-31249: concurrent.futures: WorkItem.run() used by ThreadPoolExecutor
24503 - bpo-31247: xmlrpc.server now explicitly breaks reference cycles when using
24506 - bpo-23835: configparser: reading defaults in the ``ConfigParser()``
24507   constructor is now using ``read_dict()``, making its behavior consistent
24508   with the rest of the parser.  Non-string keys and values in the defaults
24512 - bpo-31238: pydoc: the stop() method of the private ServerThread class now
24516 - bpo-5001: Many asserts in `multiprocessing` are now more informative, and
24519 - bpo-31109: Convert zipimport to use Argument Clinic.
24521 - bpo-30102: The ssl and hashlib modules now call
24524   such as POWER8. Patch is based on research from Gustavo Serra Scalet.
24526 - bpo-18966: Non-daemonic threads created by a multiprocessing.Process are
24529 - bpo-31183: `dis` now works with asynchronous generator and coroutine
24532 - bpo-5001: There are a number of uninformative asserts in the
24534   the most potentially problematic ones, since they are in error-reporting
24537   problematic change is that the AssertionError is now a TypeError; however,
24539   *reported* by the function/its caller (such as in issue 31169). - Patch by
24542 - bpo-31185: Fixed miscellaneous errors in asyncio speedup module.
24544 - bpo-31151: socketserver.ForkingMixIn.server_close() now waits until all
24547 - bpo-31072: Add an ``include_file`` parameter to
24550 - bpo-24700: Optimize array.array comparison. It is now from 10x up to 70x
24553 - bpo-31135: ttk: fix the destroy() method of LabeledScale and OptionMenu
24559 - bpo-31107: Fix `copyreg._slotnames()` mangled attribute calculation for
24562 - bpo-31080: Allow `logging.config.fileConfig` to accept kwargs and/or args.
24564 - bpo-30897: ``pathlib.Path`` objects now include an ``is_mount()`` method
24565   (only implemented on POSIX).  This is similar to ``os.path.ismount(p)``.
24568 - bpo-31061: Fixed a crash when using asyncio and threads.
24570 - bpo-30987: Added support for CAN ISO-TP protocol in the socket module.
24572 - bpo-30522: Added a ``setStream`` method to ``logging.StreamHandler`` to
24575 - bpo-30502: Fix handling of long oids in ssl.  Based on patch by Christian
24578 - bpo-5288: Support tzinfo objects with sub-minute offsets.
24580 - bpo-30919: Fix shared memory performance regression in multiprocessing in
24584 - bpo-26732: Fix too many fds in processes started with the "forkserver"
24586   still-running children.
24588 - bpo-29403: Fix ``unittest.mock``'s autospec to not fail on method-bound
24591 - bpo-30961: Fix decrementing a borrowed reference in tracemalloc.
24593 - bpo-19896: Fix multiprocessing.sharedctypes to recognize typecodes ``'q'``
24596 - bpo-30946: Remove obsolete code in readline module for platforms where GNU
24597   readline is older than 2.1 or where select() is not available.
24599 - bpo-25684: Change ``ttk.OptionMenu`` radiobuttons to be unique across
24602 - bpo-30886: Fix multiprocessing.Queue.join_thread(): it now waits until the
24606 - bpo-29854: Fix segfault in readline when using readline's history-size
24609 - bpo-30794: Added multiprocessing.Process.kill method to terminate using
24612 - bpo-30319: socket.close() now ignores ECONNRESET error.
24614 - bpo-30828: Fix out of bounds write in
24617 - bpo-30302: Use keywords in the ``repr`` of ``datetime.timedelta``.
24619 - bpo-30807: signal.setitimer() may disable the timer when passed a tiny
24620   value. Tiny values (such as 1e-6) are valid non-zero values for
24621   setitimer(), which is specified as taking microsecond-resolution
24623   1e-6 into a zero interval, therefore disabling the timer instead of
24624   (re-)scheduling it.
24626 - bpo-30441: Fix bug when modifying os.environ while iterating over it
24628 - bpo-29585: Avoid importing ``sysconfig`` from ``site`` to improve startup
24629   speed. Python startup is about 5% faster on Linux and 30% faster on macOS.
24631 - bpo-29293: Add missing parameter "n" on
24637 - bpo-30532: Fix email header value parser dropping folding white space in
24640 - bpo-30596: Add a ``close()`` method to ``multiprocessing.Process``.
24642 - bpo-9146: Fix a segmentation fault in _hashopenssl when standard hash
24644   in some special FIPS-140 build environments.
24646 - bpo-29169: Update zlib to 1.2.11.
24648 - bpo-30119: ftplib.FTP.putline() now throws ValueError on commands that
24649   contains CR or LF. Patch by Dong-hee Na.
24651 - bpo-30879: os.listdir() and os.scandir() now emit bytes names when called
24652   with bytes-like argument.
24654 - bpo-30746: Prohibited the '=' character in environment variable names in
24657 - bpo-30664: The description of a unittest subtest now preserves the order
24660 - bpo-21071: struct.Struct.format type is now :class:`str` instead of
24663 - bpo-29212: Fix concurrent.futures.thread.ThreadPoolExecutor threads to
24665   is supplied. They will now identify themselves as
24666   "ThreadPoolExecutor-y_n".
24668 - bpo-29755: Fixed the lgettext() family of functions in the gettext module.
24671 - bpo-30616: Functional API of enum allows to create empty enums. Patched by
24672   Dong-hee Na
24674 - bpo-30038: Fix race condition between signal delivery and wakeup file
24677 - bpo-23894: lib2to3 now recognizes ``rb'...'`` and ``f'...'`` strings.
24679 - bpo-24744: pkgutil.walk_packages function now raises ValueError if *path*
24680   is a string. Patch by Sanyam Khurana.
24682 - bpo-24484: Avoid race condition in multiprocessing cleanup.
24684 - bpo-30589: Fix multiprocessing.Process.exitcode to return the opposite of
24685   the signal number when the process is killed by a signal (instead of 255)
24688 - bpo-28994: The traceback no longer displayed for SystemExit raised in a
24691 - bpo-30508: Don't log exceptions if Task/Future "cancel()" method was
24694 - bpo-30645: Fix path calculation in `imp.load_package()`, fixing it for
24695   cases when a package is only shipped with bytecodes. Patch by Alexandru
24698 - bpo-11822: The dis.dis() function now is able to disassemble nested code
24701 - bpo-30624: selectors does not take KeyboardInterrupt and SystemExit into
24705 - bpo-30595: multiprocessing.Queue.get() with a timeout now polls its reader
24706   in non-blocking mode if it succeeded to acquire the lock but the acquire
24709 - bpo-28556: Updates to typing module: Add generic AsyncContextManager, add
24713 - bpo-30605: re.compile() no longer raises a BytesWarning when compiling a
24716 - bpo-29870: Fix ssl sockets leaks when connection is aborted in asyncio/ssl
24719 - bpo-29743: Closing transport during handshake process leaks open socket.
24722 - bpo-27585: Fix waiter cancellation in asyncio.Lock. Patch by Mathieu
24725 - bpo-30014: modify() method of poll(), epoll() and devpoll() based classes
24726   of selectors module is around 10% faster.  Patch by Giampaolo Rodola'.
24728 - bpo-30418: On Windows, subprocess.Popen.communicate() now also ignore
24729   EINVAL on stdin.write() if the child process is still running but closed
24732 - bpo-30463: Addded empty __slots__ to abc.ABC.  This allows subclassers to
24735 - bpo-30520: Loggers are now pickleable.
24737 - bpo-30557: faulthandler now correctly filters and displays exception codes
24740 - bpo-30526: Add TextIOWrapper.reconfigure() and a
24743 - bpo-30245: Fix possible overflow when organize struct.pack_into error
24746 - bpo-30378: Fix the problem that logging.handlers.SysLogHandler cannot
24749 - bpo-16500: Allow registering at-fork handlers.
24751 - bpo-30470: Deprecate invalid ctypes call protection on Windows.  Patch by
24754 - bpo-30414: multiprocessing.Queue._feed background running thread do not
24757 - bpo-30003: Fix handling escape characters in HZ codec.  Based on patch by
24760 - bpo-30149: inspect.signature() now supports callables with
24761   variable-argument parameters wrapped with partialmethod. Patch by Dong-hee
24764 - bpo-30436: importlib.find_spec() raises ModuleNotFoundError instead of
24765   AttributeError if the specified parent module is not a package (i.e. lacks
24768 - bpo-30301: Fix AttributeError when using SimpleQueue.empty() under *spawn*
24771 - bpo-30375: Warnings emitted when compile a regular expression now always
24775 - bpo-30329: imaplib and poplib now catch the Windows socket WSAEINVAL error
24779 - bpo-29196: Removed previously deprecated in Python 2.4 classes Plist, Dict
24784 - bpo-9850: The :mod:`macpath` is now deprecated and will be removed in
24787 - bpo-30299: Compiling regular expression in debug mode on CPython now
24790 - bpo-30048: Fixed ``Task.cancel()`` can be ignored when the task is running
24793 - bpo-30266: contextlib.AbstractContextManager now supports
24794   anti-registration by setting __enter__ = None or __exit__ = None,
24795   following the pattern introduced in bpo-25958. Patch by Jelle Zijlstra.
24797 - bpo-30340: Enhanced regular expressions optimization. This increased the
24800 - bpo-30298: Weaken the condition of deprecation warnings for inline
24806 - bpo-30285: Optimized case-insensitive matching and searching of regular
24809 - bpo-29990: Fix range checking in GB18030 decoder.  Original patch by Ma
24812 - bpo-29979: rewrite cgi.parse_multipart, reusing the FieldStorage class and
24814   multipart/form-data requests. Patch by Pierre Quentel.
24816 - bpo-30243: Removed the __init__ methods of _json's scanner and encoder.
24820 - bpo-30215: Compiled regular expression objects with the re.LOCALE flag no
24824 - bpo-30185: Avoid KeyboardInterrupt tracebacks in forkserver helper process
24825   when Ctrl-C is received.
24827 - bpo-30103: binascii.b2a_uu() and uu.encode() now support using ``'`'`` as
24830 - bpo-28556: Various updates to typing module: add typing.NoReturn type, use
24831   WrapperDescriptorType, minor bug-fixes.  Original PRs by Jim
24832   Fasarakis-Hilliard and Ivan Levkivskyi.
24834 - bpo-30205: Fix getsockname() for unbound AF_UNIX sockets on Linux.
24836 - bpo-30228: The seek() and tell() methods of io.FileIO now set the internal
24840 - bpo-30190: unittest's assertAlmostEqual and assertNotAlmostEqual provide a
24844 - bpo-30101: Add support for curses.A_ITALIC.
24846 - bpo-29822: inspect.isabstract() now works during __init_subclass__.  Patch
24849 - bpo-29960: Preserve generator state when _random.Random.setstate() raises
24852 - bpo-30070: Fixed leaks and crashes in errors handling in the parser
24855 - bpo-22352: Column widths in the output of dis.dis() are now adjusted for
24858 - bpo-30061: Fixed crashes in IOBase methods __next__() and readlines() when
24859   readline() or __next__() respectively return non-sizeable object. Fixed
24863 - bpo-30218: Fix PathLike support for shutil.unpack_archive. Patch by Jelle
24866 - bpo-10076: Compiled regular expression and match objects in the re module
24869 - bpo-30068: _io._IOBase.readlines will check if it's closed first when hint
24870   is present.
24872 - bpo-29694: Fixed race condition in pathlib mkdir with flags parents=True.
24875 - bpo-29692: Fixed arbitrary unchaining of RuntimeError exceptions in
24878 - bpo-26187: Test that sqlite3 trace callback is not called multiple times
24879   when schema is changing.  Indirectly fixed by switching to use
24880   sqlite3_prepare_v2() in bpo-9303.  Patch by Aviv Palivoda.
24882 - bpo-30017: Allowed calling the close() method of the zip entry writer
24886 - bpo-29998: Pickling and copying ImportError now preserves name and path
24889 - bpo-29995: re.escape() now escapes only regex special characters.
24891 - bpo-29962: Add math.remainder operation, implementing remainder as
24894 - bpo-29649: Improve struct.pack_into() exception messages for problems with
24897 - bpo-29654: Support If-Modified-Since HTTP header (browser cache).  Patch
24900 - bpo-29931: Fixed comparison check for ipaddress.ip_interface objects.
24903 - bpo-29953: Fixed memory leaks in the replace() method of datetime and time
24906 - bpo-29942: Fix a crash in itertools.chain.from_iterable when encountering
24909 - bpo-10030: Sped up reading encrypted ZIP files by 2 times.
24911 - bpo-29204: Element.getiterator() and the html parameter of XMLParser()
24915 - bpo-27863: Fixed multiple crashes in ElementTree caused by race conditions
24918 - bpo-25996: Added support of file descriptors in os.scandir() on Unix.
24919   os.fwalk() is sped up by 2 times by using os.scandir().
24921 - bpo-28699: Fixed a bug in pools in multiprocessing.pool that raising an
24925 - bpo-23890: unittest.TestCase.assertRaises() now manually breaks a
24928 - bpo-29901: The zipapp module now supports general path-like objects, not
24931 - bpo-25803: Avoid incorrect errors raised by Path.mkdir(exist_ok=True) when
24934 - bpo-29861: Release references to tasks, their arguments and their results
24937 - bpo-19930: The mode argument of os.makedirs() no longer affects the file
24938   permission bits of newly created intermediate-level directories.
24940 - bpo-29884: faulthandler: Restore the old sigaltstack during teardown.
24943 - bpo-25455: Fixed crashes in repr of recursive buffered file-like objects.
24945 - bpo-29800: Fix crashes in partial.__repr__ if the keys of partial.keywords
24948 - bpo-8256: Fixed possible failing or crashing input() if attributes
24952 - bpo-28692: Using non-integer value for selecting a plural form in gettext
24953   is now deprecated.
24955 - bpo-26121: Use C library implementation for math functions erf() and
24958 - bpo-29619: os.stat() and os.DirEntry.inode() now convert inode (st_ino)
24961 - bpo-28298: Fix a bug that prevented array 'Q', 'L' and 'I' from accepting
24964 - bpo-29645: Speed up importing the webbrowser module.
24965   webbrowser.register() is now thread-safe.
24967 - bpo-28231: The zipfile module now accepts path-like objects for external
24970 - bpo-26915: index() and count() methods of collections.abc.Sequence now
24973 - bpo-28682: Added support for bytes paths in os.fwalk().
24975 - bpo-29728: Add new :data:`socket.TCP_NOTSENT_LOWAT` (Linux 3.12) constant.
24978 - bpo-29623: Allow use of path-like object as a single argument in
24981 - bpo-9303: Migrate sqlite3 module to _v2 API.  Patch by Aviv Palivoda.
24983 - bpo-28963: Fix out of bound iteration in
24986 - bpo-29704: asyncio.subprocess.SubprocessStreamProtocol no longer closes
24989 - bpo-29271: Fix Task.current_task and Task.all_tasks implemented in C to
24992 - bpo-29703: Fix asyncio to support instantiation of new event loops in
24995 - bpo-29615: SimpleXMLRPCDispatcher no longer chains KeyError (or any other
24999 - bpo-7769: Method register_function() of
25003 - bpo-29376: Fix assertion error in threading._DummyThread.is_alive().
25005 - bpo-28624: Add a test that checks that cwd parameter of Popen() accepts
25008 - bpo-28518: Start a transaction implicitly before a DML statement. Patch by
25011 - bpo-29742: get_extra_info() raises exception if get called on closed ssl
25014 - bpo-16285: urllib.parse.quote is now based on RFC 3986 and hence includes
25015   '~' in the set of characters that is not quoted by default. Patch by
25018 - bpo-29532: Altering a kwarg dictionary passed to functools.partial() no
25021 - bpo-29110: Fix file object leak in aifc.open() when file is given as a
25022   filesystem path and is not in valid AIFF format. Patch by Anthony Zhang.
25024 - bpo-22807: Add uuid.SafeUUID and uuid.UUID.is_safe to relay information
25028 - bpo-29576: Improve some deprecations in importlib. Some deprecated methods
25031 - bpo-29534: Fixed different behaviour of Decimal.from_float() for _decimal
25034 - bpo-10379: locale.format_string now supports the 'monetary' keyword
25035   argument, and locale.format is deprecated.
25037 - bpo-29851: importlib.reload() now raises ModuleNotFoundError if the module
25040 - bpo-28556: Various updates to typing module: typing.Counter,
25044 - bpo-29100: Fix datetime.fromtimestamp() regression introduced in Python
25047 - bpo-29416: Prevent infinite loop in pathlib.Path.mkdir
25049 - bpo-29444: Fixed out-of-bounds buffer access in the group() method of the
25052 - bpo-29377: Add WrapperDescriptorType, MethodWrapperType, and
25053   MethodDescriptorType built-in types to types module. Original patch by
25056 - bpo-29218: Unused install_misc command is now removed.  It has been
25059 - bpo-29368: The extend() method is now called instead of the append()
25060   method when unpickle collections.deque and other list-like objects. This
25063 - bpo-29338: The help of a builtin or extension class now includes the
25064   constructor signature if __text_signature__ is provided for the class.
25066 - bpo-29335: Fix subprocess.Popen.wait() when the child process has exited
25069 - bpo-29290: Fix a regression in argparse that help messages would wrap at
25070   non-breaking spaces.
25072 - bpo-28735: Fixed the comparison of mock.MagickMock with mock.ANY.
25074 - bpo-29197: Removed deprecated function ntpath.splitunc().
25076 - bpo-29210: Removed support of deprecated argument "exclude" in
25079 - bpo-29219: Fixed infinite recursion in the repr of uninitialized
25082 - bpo-29192: Removed deprecated features in the http.cookies module.
25084 - bpo-29193: A format string argument for string.Formatter.format() is now
25085   positional-only.
25087 - bpo-29195: Removed support of deprecated undocumented keyword arguments in
25090 - bpo-28969: Fixed race condition in C implementation of
25095 - bpo-20804: The unittest.mock.sentinel attributes now preserve their
25098 - bpo-29142: In urllib.request, suffixes in no_proxy environment variable
25102 - bpo-28961: Fix unittest.mock._Call helper: don't ignore the name parameter
25105 - bpo-15812: inspect.getframeinfo() now correctly shows the first line of a
25108 - bpo-28985: Update authorizer constants in sqlite3 module. Patch by
25111 - bpo-29079: Prevent infinite loop in pathlib.resolve() on Windows
25113 - bpo-13051: Fixed recursion errors in large or resized
25116 - bpo-9770: curses.ascii predicates now work correctly with negative
25119 - bpo-28427: old keys should not remove new values from WeakValueDictionary
25122 - bpo-28923: Remove editor artifacts from Tix.py.
25124 - bpo-28871: Fixed a crash when deallocate deep ElementTree.
25126 - bpo-19542: Fix bugs in WeakValueDictionary.setdefault() and
25129 - bpo-20191: Fixed a crash in resource.prlimit() when passing a sequence
25132 - bpo-16255: subprocess.Popen uses /system/bin/sh on Android as the shell,
25135 - bpo-28779: multiprocessing.set_forkserver_preload() would crash the
25139 - bpo-26937: The chown() method of the tarfile.TarFile class does not fail
25143 - bpo-28847: dbm.dumb now supports reading read-only files and no longer
25144   writes the index file when it is not changed.  A deprecation warning is
25145   now emitted if the index file is missed and recreated in the 'r' and 'w'
25148 - bpo-27030: Unknown escapes consisting of ``'\'`` and an ASCII letter in
25151 - bpo-28835: Fix a regression introduced in warnings.catch_warnings(): call
25154 - bpo-27172: To assist with upgrades from 2.7, the previously documented
25156   decision may be revisited again after the Python 2.7 branch is no longer
25159 - bpo-28740: Add sys.getandroidapilevel(): return the build time API version
25162 - bpo-26273: Add new :data:`socket.TCP_CONGESTION` (Linux 2.6.13) and
25166 - bpo-28752: Restored the __reduce__() methods of datetime objects.
25168 - bpo-28727: Regular expression patterns, _sre.SRE_Pattern objects created
25171   the warnings module is reloaded (thing usually only done in unit tests).
25173 - bpo-20572: Remove the subprocess.Popen.wait endtime parameter.  It was
25176 - bpo-25659: In ctypes, prevent a crash calling the from_buffer() and
25179 - bpo-28548: In the "http.server" module, parse the protocol version if
25182 - bpo-19717: Makes Path.resolve() succeed on paths that do not exist. Patch
25185 - bpo-28563: Fixed possible DoS and arbitrary code execution when handle
25189 - bpo-28387: Fixed possible crash in _io.TextIOWrapper deallocator when the
25190   garbage collector is invoked in other thread.  Based on patch by Sebastian
25193 - bpo-27517: LZMA compressor and decompressor no longer raise exceptions if
25196 - bpo-28549: Fixed segfault in curses's addch() with ncurses6.
25198 - bpo-28449: tarfile.open() with mode "r" or "r:" now tries to open a tar
25202 - bpo-23262: The webbrowser module now supports Firefox 36+ and derived
25205 - bpo-24241: The webbrowser in an X environment now prefers using the
25210 - bpo-27939: Fixed bugs in tkinter.ttk.LabeledScale and tkinter.Scale caused
25212   now works if float value is set to underlying Tk variable.
25214 - bpo-28255: calendar.TextCalendar.prweek() no longer prints a space after a
25218 - bpo-28255: calendar.TextCalendar.prmonth() no longer prints a space at the
25222 - bpo-20491: The textwrap.TextWrapper class now honors non-breaking spaces.
25225 - bpo-28353: os.fwalk() no longer fails on broken links.
25227 - bpo-28430: Fix iterator of C implemented asyncio.Future doesn't accept
25228   non-None value is passed to it.send(val).
25230 - bpo-27025: Generated names for Tkinter widgets now start by the "!" prefix
25233 - bpo-25464: Fixed HList.header_exists() in tkinter.tix module by addin a
25236 - bpo-28488: shutil.make_archive() no longer adds entry "./" to ZIP archive.
25238 - bpo-25953: re.sub() now raises an error for invalid numerical group
25239   reference in replacement template even if the pattern is not found in the
25243 - bpo-28469: timeit now uses the sequence 1, 2, 5, 10, 20, 50,... instead of
25246 - bpo-28115: Command-line interface of the zipfile module now uses argparse.
25249 - bpo-18219: Optimize csv.DictWriter for large number of columns. Patch by
25252 - bpo-28448: Fix C implemented asyncio.Future didn't work on Windows.
25254 - bpo-23214: In the "io" module, the argument to BufferedReader and
25255   BytesIO's read1() methods is now optional and can be -1, matching the
25258 - bpo-28480: Fix error building socket module when multithreading is
25261 - bpo-28240: timeit: remove ``-c/--clock`` and ``-t/--time`` command line
25264 - bpo-28240: timeit now repeats the benchmarks 5 times instead of only 3 to
25267 - bpo-28240: timeit autorange now uses a single loop iteration if the
25269   -m timeit -s 'import time' 'time.sleep(1)'" now takes 4 seconds instead of
25272 - Distutils.sdist now looks for README and setup.py files with case
25277 - bpo-24452: Make webbrowser support Chrome on Mac OS X. Patch by Ned
25280 - bpo-20766: Fix references leaked by pdb in the handling of SIGINT
25283 - bpo-27998: Fixed bytes path support in os.scandir() on Windows. Patch by
25286 - bpo-28317: The disassembler now decodes FORMAT_VALUE argument.
25288 - bpo-28380: unittest.mock Mock autospec functions now properly support
25291 - bpo-28229: lzma module now supports pathlib.
25293 - bpo-28321: Fixed writing non-BMP characters with binary format in
25296 - bpo-28225: bz2 module now supports pathlib.  Initial patch by Ethan
25299 - bpo-28227: gzip now supports pathlib.  Patch by Ethan Furman.
25301 - bpo-28332: Deprecated silent truncations in socket.htons and socket.ntohs.
25304 - bpo-27358: Optimized merging var-keyword arguments and improved error
25305   message when passing a non-mapping as a var-keyword argument.
25307 - bpo-28257: Improved error message when passing a non-iterable as a
25308   var-positional argument.  Added opcode BUILD_TUPLE_UNPACK_WITH_CALL.
25310 - bpo-28322: Fixed possible crashes when unpickle itertools objects from
25313 - bpo-28228: imghdr now supports pathlib.
25315 - bpo-28226: compileall now supports pathlib.
25317 - bpo-28314: Fix function declaration (C flags) for the getiterator() method
25320 - bpo-28148: Stop using localtime() and gmtime() in the time module.
25321   Introduced platform independent _PyTime_localtime API that is similar to
25324 - bpo-28253: Fixed calendar functions for extreme months: 0001-01 and
25325   9999-12. Methods itermonthdays() and itermonthdays2() are reimplemented so
25329 - bpo-28275: Fixed possible use after free in the decompress() methods of
25333 - bpo-27897: Fixed possible crash in sqlite3.Connection.create_collation()
25334   if pass invalid string-like object as a name.  Patch by Xiang Zhang.
25336 - bpo-18844: random.choices() now has k as a keyword-only argument to
25340 - bpo-18893: Fix invalid exception handling in Lib/ctypes/macholib/dyld.py.
25343 - bpo-27611: Fixed support of default root window in the tkinter.tix module.
25346 - bpo-27348: In the traceback module, restore the formatting of exception
25350 - bpo-25651: Allow falsy values to be used for msg parameter of subTest().
25352 - bpo-27778: Fix a memory leak in os.getrandom() when the getrandom() is
25355 - bpo-28200: Fix memory leak on Windows in the os module (fix
25358 - bpo-25400: RobotFileParser now correctly returns default values for
25361 - bpo-27932: Prevent memory leak in win32_ver().
25363 - Fix UnboundLocalError in socket._sendfile_use_sendfile.
25365 - bpo-28075: Check for ERROR_ACCESS_DENIED in Windows implementation of
25368 - bpo-22493: Warning message emitted by using inline flags in the middle of
25372 - bpo-25270: Prevent codecs.escape_encode() from raising SystemError when an
25373   empty bytestring is passed.
25375 - bpo-28181: Get antigravity over HTTPS. Patch by Kaartic Sivaraam.
25377 - bpo-25895: Enable WebSocket URL schemes in urllib.parse.urljoin. Patch by
25380 - bpo-28114: Fix a crash in parse_envlist() when env contains byte strings.
25383 - bpo-27599: Fixed buffer overrun in binascii.b2a_qp() and
25386 - bpo-27906: Fix socket accept exhaustion during high TCP traffic. Patch by
25389 - bpo-28174: Handle when SO_REUSEPORT isn't properly supported. Patch by
25392 - bpo-26654: Inspect functools.partial in asyncio.Handle.__repr__. Patch by
25395 - bpo-26909: Fix slow pipes IO in asyncio. Patch by INADA Naoki.
25397 - bpo-28176: Fix callbacks race in asyncio.SelectorLoop.sock_connect.
25399 - bpo-27759: Fix selectors incorrectly retain invalid file descriptors.
25402 - bpo-28325: Remove vestigial MacOS 9 macurl2path module and its tests.
25404 - bpo-28368: Refuse monitoring processes if the child watcher has no loop
25407 - bpo-28369: Raise RuntimeError when transport's FD is used with add_reader,
25410 - bpo-28370: Speedup asyncio.StreamReader.readexactly. Patch by Коренберг
25413 - bpo-28371: Deprecate passing asyncio.Handles to run_in_executor.
25415 - bpo-28372: Fix asyncio to support formatting of non-python coroutines.
25417 - bpo-28399: Remove UNIX socket from FS before binding. Patch by Коренберг
25420 - bpo-27972: Prohibit Tasks to await on themselves.
25422 - bpo-24142: Reading a corrupt config file left configparser in an invalid
25425 - bpo-29581: ABCMeta.__new__ now accepts ``**kwargs``, allowing abstract
25429 - bpo-25532: inspect.unwrap() will now only try to unwrap an object
25433 - bpo-30177: path.resolve(strict=False) no longer cuts the path after the
25437 -------------
25439 - bpo-31294: Fix incomplete code snippet in the ZeroMQSocketListener and
25442 - bpo-21649: Add RFC 7525 and Mozilla server side TLS links to SSL
25445 - bpo-31128: Allow the pydoc server to bind to arbitrary hostnames.
25447 - bpo-30803: Clarify doc on truth value testing. Original patch by Peter
25450 - bpo-30176: Add missing attribute related constants in curses
25453 - bpo-30052: the link targets for :func:`bytes` and :func:`bytearray` are
25455   builtin function entries. Use :ref:`bytes <func-bytes>` and
25456   :ref:`bytearray <func-bytearray>` to reference the latter. In order to
25457   ensure this and future cross-reference updates are applied automatically,
25461 - bpo-26985: Add missing info of code object in inspect documentation.
25463 - bpo-19824: Improve the documentation for, and links to, template strings
25465   some usage constraints. (See also: bpo-20314, bpo-12518)
25467 - bpo-28929: Link the documentation to its source file on GitHub.
25469 - bpo-25008: Document smtpd.py as effectively deprecated and add a pointer
25470   to aiosmtpd, a third-party asyncio-based replacement.
25472 - bpo-26355: Add canonical header link on each page to corresponding major
25475 - bpo-29349: Fix Python 2 syntax in code for building the documentation.
25477 - bpo-23722: The data model reference and the porting section in the 3.6
25480   zero-argument ``super()``.
25482 - bpo-28513: Documented command-line interface of zipfile.
25485 -----
25487 - bpo-29639: test.support.HOST is now "localhost", a new HOSTv4 constant has
25491 - bpo-31320: Silence traceback in test_ssl
25493 - bpo-31346: Prefer PROTOCOL_TLS_CLIENT and PROTOCOL_TLS_SERVER protocols
25496 - bpo-25674: Remove sha256.tbs-internet.com ssl test
25498 - bpo-30715: Address ALPN callback changes for OpenSSL 1.1.0f. The latest
25501 - bpo-30822: regrtest: Exclude tzdata from regrtest --all. When running the
25502   test suite using --use=all / -u all, exclude tzdata since it makes
25503   test_datetime too slow (15-20 min on some buildbots) which then times out
25505   -u extralargefile to run test_zipfile64.
25507 - bpo-30695: Add the `set_nomemory(start, stop)` and `remove_mem_hooks()`
25510 - bpo-30357: test_thread: setUp() now uses support.threading_setup() and
25515 - bpo-30197: Enhanced functions swap_attr() and swap_item() in the
25519   clause, if there is one.
25521 - bpo-24932: Use proper command line parsing in _testembed
25523 - bpo-28950: Disallow -j0 to be combined with -T/-l in regrtest command line
25526 - bpo-28683: Fix the tests that bind() a unix socket and raise
25527   PermissionError on Android for a non-root user.
25529 - bpo-26936: Fix the test_socket failures on Android - getservbyname(),
25532 - bpo-28666: Now test.support.rmtree is able to remove unwritable or
25535 - bpo-23839: Various caches now are cleared before running every test file.
25537 - bpo-26944: Fix test_posix for Android where 'id -G' is entirely wrong or
25540 - bpo-28409: regrtest: fix the parser of command line arguments.
25542 - bpo-28217: Adds _testconsole module to test console input.
25544 - bpo-26939: Add the support.setswitchinterval() function to fix
25548 -----
25550 - bpo-31354: Allow --with-lto to be used on all builds, not just `make
25551   profile-opt`.
25553 - bpo-31370: Remove support for building --without-threads. This option is
25556   difficult to maintain low-level internal code.
25558 - bpo-31341: Per :pep:`11`, support for the IRIX operating system was
25561 - bpo-30854: Fix compile error when compiling --without-threads. Patch by
25564 - bpo-30687: Locate msbuild.exe on Windows when building rather than
25567 - bpo-20210: Support the *disabled* marker in Setup files. Extension modules
25571 - bpo-29941: Add ``--with-assertions`` configure flag to explicitly enable C
25572   ``assert()`` checks. Defaults to off. ``--with-pydebug`` implies
25573   ``--with-assertions``.
25575 - bpo-28787: Fix out-of-tree builds of Python when configured with
25576   ``--with--dtrace``.
25578 - bpo-29243: Prevent unnecessary rebuilding of Python during ``make test``,
25580   ``--enable-optimizations``.
25582 - bpo-23404: Don't regenerate generated files based on file modification
25583   time anymore: the action is now explicit. Replace ``make touch`` with
25584   ``make regen-all``.
25586 - bpo-29643: Fix ``--enable-optimization`` didn't work.
25588 - bpo-27593: sys.version and the platform module python_build(),
25592 - bpo-29572: Update Windows build and OS X installers to use OpenSSL 1.0.2k.
25594 - bpo-27659: Prohibit implicit C function declarations: use
25595   ``-Werror=implicit-function-declaration`` when possible (GCC and Clang,
25598 - bpo-29384: Remove old Be OS helper scripts.
25600 - bpo-26851: Set Android compilation and link flags.
25602 - bpo-28768: Fix implicit declaration of function _setmode. Patch by
25605 - bpo-29080: Removes hard dependency on hg.exe from PCBuild/build.bat
25607 - bpo-23903: Added missed names to PC/python3.def.
25609 - bpo-28762: lockf() is available on Android API level 24, but the F_LOCK
25610   macro is not defined in android-ndk-r13.
25612 - bpo-28538: Fix the compilation error that occurs because if_nameindex() is
25613   available on Android API level 24, but the if_nameindex structure is not
25616 - bpo-20211: Do not add the directory for installing C header files and the
25620 - bpo-28849: Do not define sys.implementation._multiarch on Android.
25622 - bpo-10656: Fix out-of-tree building on AIX.  Patch by Tristan Carel and
25625 - bpo-26359: Rename --with-optimiations to --enable-optimizations.
25627 - bpo-28444: Fix missing extensions modules when cross compiling.
25629 - bpo-28208: Update Windows build and OS X installers to use SQLite 3.14.2.
25631 - bpo-28248: Update Windows build and OS X installers to use OpenSSL 1.0.2j.
25633 - bpo-21124: Fix building the _struct module on Cygwin by passing ``NULL``
25637 - bpo-13756: Fix building extensions modules on Cygwin.  Patch by Roumen
25640 - bpo-21085: Add configure check for siginfo_t.si_band, which Cygwin does
25644 - bpo-28258: Fixed build with Estonian locale (python-config and distclean
25647 - bpo-26661: setup.py now detects system libffi with multiarch wrapper.
25649 - bpo-27979: A full copy of libffi is no longer bundled for use when
25650   building _ctypes on non-OSX UNIX platforms.  An installed copy of libffi
25651   is now required when building _ctypes on such platforms.
25653 - bpo-15819: Remove redundant include search directory option for building
25656 - bpo-28676: Prevent missing 'getentropy' declaration warning on macOS.
25660 -------
25662 - bpo-31392: Update Windows build to use OpenSSL 1.1.0f
25664 - bpo-30389: Adds detection of Visual Studio 2017 to distutils on Windows.
25666 - bpo-31358: zlib is no longer bundled in the CPython source, instead it is
25669 - bpo-31340: Change to building with MSVC v141 (included with Visual Studio
25672 - bpo-30581: os.cpu_count() now returns the correct number of processors on
25673   Windows when the number of logical processors is greater than 64.
25675 - bpo-30916: Pre-build OpenSSL, Tcl and Tk and include the binaries in the
25678 - bpo-30731: Add a missing xmlns to python.manifest so that it matches the
25681 - bpo-30291: Allow requiring 64-bit interpreters from py.exe using -64
25684 - bpo-30362: Adds list options (-0, -0p) to py.exe launcher. Contributed by
25687 - bpo-23451: Fix socket deprecation warnings in socketmodule.c. Patch by
25690 - bpo-30450: The build process on Windows no longer depends on Subversion,
25692   3.6 is not found on the system (via ``py -3.6``), NuGet is used to
25693   download a copy of 32-bit Python.
25695 - bpo-29579: Removes readme.txt from the installer.
25697 - bpo-25778: winreg does not truncate string correctly (Patch by Eryk Sun)
25699 - bpo-28896: Deprecate WindowsRegistryFinder and disable it by default
25701 - bpo-28522: Fixes mishandled buffer reallocation in getpathp.c
25703 - bpo-28402: Adds signed catalog files for stdlib on Windows.
25705 - bpo-28333: Enables Unicode for ps1/ps2 and input() prompts. (Patch by Eryk
25708 - bpo-28251: Improvements to help manuals on Windows.
25710 - bpo-28110: launcher.msi has different product codes between 32-bit and
25711   64-bit
25713 - bpo-28161: Opening CON for write access fails
25715 - bpo-28162: WindowsConsoleIO readall() fails if first line starts with
25718 - bpo-28163: WindowsConsoleIO fileno() passes wrong flags to _open_osfhandle
25720 - bpo-28164: _PyIO_get_console_type fails for various paths
25722 - bpo-28137: Renames Windows path file to ._pth
25724 - bpo-28138: Windows ._pth file should allow import site
25727 ----
25729 - bpo-31493: IDLE code context -- fix code update and font update timers.
25732 - bpo-31488: IDLE - Update non-key options in former extension classes. When
25737 - bpo-31477: IDLE - Improve rstrip entry in doc. Strip trailing whitespace
25740 - bpo-31480: IDLE - make tests pass with zzdummy extension disabled by
25743 - bpo-31421: Document how IDLE runs tkinter programs. IDLE calls tcl/tk
25747 - bpo-31414: IDLE -- fix tk entry box tests by deleting first. Adding to an
25748   int entry is not the same as deleting and inserting because int('') will
25751 - bpo-31051: Rearrange IDLE configdialog GenPage into Window, Editor, and
25754 - bpo-30617: IDLE - Add docstrings and tests for outwin subclass of editor.
25758 - bpo-31287: IDLE - Do not modify tkinter.message in test_configdialog.
25760 - bpo-27099: Convert IDLE's built-in 'extensions' to regular features. About
25763   maintenance. Hence the conversion. The main difference for users is that
25766   the keyset. All bindings are defined together in the system-specific
25767   default keysets in config-extensions.def. All custom keysets are saved as
25768   a whole in config-extension.cfg.  All take effect as soon as one clicks
25769   Apply or Ok. The affected events are '<<force-open-completions>>',
25770   '<<expand-word>>', '<<force-open-calltip>>', '<<flash-paren>>',
25771   '<<format-paragraph>>', '<<run-module>>', '<<check-module>>', and
25772   '<<zoom-height>>'.  Any (global) customizations made before 3.6.3 will not
25773   affect their keyset-specific customization after 3.6.3. and vice versa.
25776 - bpo-31206: IDLE: Factor HighPage(Frame) class from ConfigDialog. Patch by
25779 - bpo-31001: Add tests for configdialog highlight tab.  Patch by Cheryl
25782 - bpo-31205: IDLE: Factor KeysPage(Frame) class from ConfigDialog.  The
25785 - bpo-31130: IDLE -- stop leaks in test_configdialog. Initial patch by
25788 - bpo-31002: Add tests for configdialog keys tab. Patch by Cheryl Sabella.
25790 - bpo-19903: IDLE: Calltips use `inspect.signature` instead of
25794 - bpo-31083: IDLE - Add an outline of a TabPage class in configdialog.
25797 - bpo-31050: Factor GenPage(Frame) class from ConfigDialog. The slightly
25800 - bpo-31004: IDLE - Factor FontPage(Frame) class from ConfigDialog. Slightly
25804 - bpo-30781: IDLE - Use ttk widgets in ConfigDialog. Patches by Terry Jan
25807 - bpo-31060: IDLE - Finish rearranging methods of ConfigDialog Grouping
25811 - bpo-30853: IDLE -- Factor a VarTrace class out of ConfigDialog. Instance
25813   When tracing is turned on, setting the variable calls the function.  Test
25814   coverage for the new class is 100%.
25816 - bpo-31003: IDLE: Add more tests for General tab.
25818 - bpo-30993: IDLE - Improve configdialog font page and tests. In
25829 - bpo-30981: IDLE -- Add more configdialog font page tests.
25831 - bpo-28523: IDLE: replace 'colour' with 'color' in configdialog.
25833 - bpo-30917: Add tests for idlelib.config.IdleConf. Increase coverage from
25836 - bpo-30934: Document coverage details for idlelib tests. Add section to
25837   idlelib/idle-test/README.txt. Include check that branches are taken both
25838   ways. Exclude IDLE-specific code that does not run during unit tests.
25840 - bpo-30913: IDLE: Document ConfigDialog tk Vars, methods, and widgets in
25844 - bpo-30899: IDLE: Add tests for ConfigParser subclasses in config. Patch by
25847 - bpo-30881: IDLE: Add docstrings to browser.py. Patch by Cheryl Sabella.
25849 - bpo-30851: IDLE: Remove unused variables in configdialog.  One is a
25850   duplicate, one is set but cannot be altered by users. Patch by Cheryl
25853 - bpo-30870: IDLE: In Settings dialog, select font with Up, Down keys as
25856 - bpo-8231: IDLE: call config.IdleConf.GetUserCfgDir only once.
25858 - bpo-30779: IDLE: Factor ConfigChanges class from configdialog, put in
25868 - bpo-30777: IDLE: configdialog - Add docstrings and fix comments. Patch by
25871 - bpo-30495: IDLE: Improve textview with docstrings, PEP8 names, and more
25874 - bpo-30723: IDLE: Make several improvements to parenmatch. Add 'parens'
25875   style to highlight both opener and closer. Make 'default' style, which is
25876   not default, a synonym for 'opener'. Make time-delay work the same with
25880 - bpo-30674: IDLE: add docstrings to grep module. Patch by Cheryl Sabella
25882 - bpo-21519: IDLE's basic custom key entry dialog now detects duplicates
25885 - bpo-29910: IDLE no longer deletes a character after commenting out a
25889 - bpo-30728: Review and change idlelib.configdialog names. Lowercase method
25894 - bpo-6739: IDLE: Verify user-entered key sequences by trying to bind them
25898 - bpo-15786: Fix several problems with IDLE's autocompletion box. The
25903 - bpo-25514: Add doc subsubsection about IDLE failure to start. Popup
25904   no-connection message directs users to this section.
25906 - bpo-30642: Fix reference leaks in IDLE tests. Patches by Louie Lu and
25909 - bpo-30495: Add docstrings for textview.py and use PEP8 names. Patches by
25912 - bpo-30290: Help-about: use pep8 names and add tests. Increase coverage to
25915 - bpo-30303: Add _utest option to textview; add new tests. Increase coverage
25918 - bpo-29071: IDLE colors f-string prefixes (but not invalid ur prefixes).
25920 - bpo-28572: Add 10% to coverage of IDLE's test_configdialog. Update and
25924 -----------
25926 - bpo-30983: gdb integration commands (py-bt, etc.) work on optimized shared
25928   inlines PyEval_EvalFrameEx on non-debug shared builds.  This broke the
25929   ability to use py-bt, py-up, and a few other Python-specific gdb
25930   integrations. The problem is fixed by only looking for
25931   _PyEval_EvalFrameDefault frames in python-gdb.py.  Original patch by Bruno
25934 - bpo-29748: Added the slice index converter in Argument Clinic.
25936 - bpo-24037: Argument Clinic now uses the converter `bool(accept={int})`
25941 - bpo-29367: python-gdb.py now supports also ``method-wrapper``
25944 - bpo-28023: Fix python-gdb.py didn't support new dict implementation.
25946 - bpo-15369: The pybench and pystone microbenchmark have been removed from
25948   https://github.com/python/pyperformance which is more reliable and
25951 - bpo-28102: The zipfile module CLI now prints usage to stderr. Patch by
25955 -----
25957 - bpo-31338: Added the ``Py_UNREACHABLE()`` macro for code paths which are
25961 - bpo-30832: Remove own implementation for thread-local storage. CPython has
25962   provided the own implementation for thread-local storage (TLS) on
25968 - bpo-30708: PyUnicode_AsWideCharString() now raises a ValueError if the
25969   second argument is NULL and the wchar_t\* string contains null characters.
25971 - bpo-16500: Deprecate PyOS_AfterFork() and add PyOS_BeforeFork(),
25974 - bpo-6532: The type of results of PyThread_start_new_thread() and
25978 - bpo-27867: Function PySlice_GetIndicesEx() is deprecated and replaced with
25979   a macro if Py_LIMITED_API is not set or set to the value between
25983 - bpo-29083: Fixed the declaration of some public API functions.
25987   PY_SSIZE_T_CLEAN is defined.
25989 - bpo-28769: The result of PyUnicode_AsUTF8AndSize() and PyUnicode_AsUTF8()
25990   is now of type ``const char *`` rather of ``char *``.
25992 - bpo-29058: All stable API extensions added after Python 3.2 are now
25993   available only when Py_LIMITED_API is set to the PY_VERSION_HEX value of
25996 - bpo-28822: The index parameters *start* and *end* of PyUnicode_FindChar()
25999 - bpo-28808: PyUnicode_CompareWithASCIIString() now never raises exceptions.
26001 - bpo-28761: The fields name and doc of structures PyMemberDef, PyGetSetDef,
26005 - bpo-28748: Private variable _Py_PackageContext is now of type ``const char
26008 - bpo-19569: Compiler warnings are now emitted if use most of deprecated
26011 - bpo-28426: Deprecated undocumented functions PyUnicode_AsEncodedObject(),
26019 *Release date: 2018-06-27*
26028 *Release date: 2018-06-11*
26031 -----------------
26033 - bpo-33786: Fix asynchronous generators to handle GeneratorExit in athrow()
26036 - bpo-30654: Fixed reset of the SIGINT handler to SIG_DFL on interpreter
26040 - bpo-33622: Fixed a leak when the garbage collector fails to add an object
26043   exception is set and preserves it.
26045 - bpo-31849: Fix signed/unsigned comparison warning in pyhash.c.
26047 - bpo-33391: Fix a leak in set_symmetric_difference().
26049 - bpo-28055: Fix unaligned accesses in siphash24(). Patch by Rolf Eike Beer.
26051 - bpo-33231: Fix potential memory leak in ``normalizestring()``.
26053 - bpo-29922: Improved error messages in 'async with' when ``__aenter__()``
26054   or ``__aexit__()`` return non-awaitable object.
26056 - bpo-33199: Fix ``ma_version_tag`` in dict implementation is uninitialized
26057   when copying from key-sharing dict.
26059 - bpo-33041: Fixed jumping when the function contains an ``async for`` loop.
26061 - bpo-32282: Fix an unnecessary ifdef in the include of VersionHelpers.h in
26064 - bpo-21983: Fix a crash in `ctypes.cast()` in case the type argument is a
26068 -------
26070 - bpo-30167: Prevent site.main() exception if PYTHONSTARTUP is set. Patch by
26073 - bpo-33812: Datetime instance d with non-None tzinfo, but with
26074   d.tzinfo.utcoffset(d) returning None is now treated as naive by the
26077 - bpo-30805: Avoid race condition with debug logging
26079 - bpo-33767: The concatenation (``+``) and repetition (``*``) sequence
26083 - bpo-32684: Fix gather to propagate cancellation of itself even with
26086 - bpo-33674: Fix a race condition in SSLProtocol.connection_made() of
26091 - bpo-31647: Fixed bug where calling write_eof() on a
26094 - bpo-33672: Fix Task.__repr__ crash with Cython's bogus coroutines
26096 - bpo-33469: Fix RuntimeError after closing loop that used run_in_executor
26098 - bpo-11874: Use a better regex when breaking usage into wrappable parts.
26101 - bpo-30877: Fixed a bug in the Python implementation of the JSON decoder
26103   the decoding. Based on patch by c-fos.
26105 - bpo-33548: tempfile._candidate_tempdir_list should consider common TEMP
26108 - bpo-33542: Prevent ``uuid.get_node`` from using a DUID instead of a MAC on
26111 - bpo-26819: Fix race condition with `ReadTransport.resume_reading` in
26114 - bpo-28556: Minor fixes in typing module: add annotations to
26118 - bpo-20087: Updated alias mapping with glibc 2.27 supported locales.
26120 - bpo-33422: Fix trailing quotation marks getting deleted when looking up
26123 - bpo-33197: Update error message when constructing invalid
26124   inspect.Parameters Patch by Dong-hee Na.
26126 - bpo-33383: Fixed crash in the get() method of the :mod:`dbm.ndbm` database
26127   object when it is called with a single argument.
26129 - bpo-33329: Fix multiprocessing regression on newer glibcs
26131 - bpo-991266: Fix quoting of the ``Comment`` attribute of
26134 - bpo-33131: Upgrade bundled version of pip to 10.0.1.
26136 - bpo-33308: Fixed a crash in the :mod:`parser` module when converting an ST
26140 - bpo-33263: Fix FD leak in `_SelectorSocketTransport`  Patch by Vlad
26143 - bpo-33256: Fix display of ``<module>`` call in the html produced by
26146 - bpo-33203: ``random.Random.choice()`` now raises ``IndexError`` for empty
26150 - bpo-33224: Update difflib.mdiff() for :pep:`479`.  Convert an uncaught
26151   StopIteration in a generator into a return-statement.
26153 - bpo-33209: End framing at the end of C implementation of
26156 - bpo-32861: The urllib.robotparser's ``__str__`` representation now
26157   includes wildcard entries and the "Crawl-delay" and "Request-rate" fields.
26160 - bpo-33096: Allow ttk.Treeview.insert to insert iid that has a false
26164 - bpo-33127: The ssl module now compiles with LibreSSL 2.7.1.
26166 - bpo-33021: Release the GIL during fstat() calls, avoiding hang of all
26170 - bpo-27683: Fix a regression in :mod:`ipaddress` that result of
26171   :meth:`hosts` is empty when the network is constructed by a tuple
26174 - bpo-32844: Fix wrong redirection of a low descriptor (0 or 1) to stderr in
26175   subprocess if another low descriptor is closed.
26177 - bpo-31908: Fix output of cover files for ``trace`` module command-line
26178   tool. Previously emitted cover files only when ``--missing`` option was
26181 - bpo-31457: If nested log adapters are used, the inner ``process()``
26184 - bpo-16865: Support arrays >=2GiB in :mod:`ctypes`.  Patch by Segev Finer.
26186 - bpo-31238: pydoc: the stop() method of the private ServerThread class now
26191 -------------
26193 - bpo-33503: Fix broken pypi link
26195 - bpo-33421: Add missing documentation for ``typing.AsyncContextManager``.
26197 - bpo-33378: Add Korean language switcher for https://docs.python.org/3/
26199 - bpo-33276: Clarify that the ``__path__`` attribute on modules cannot be
26202 - bpo-33201: Modernize documentation for writing C extension types.
26204 - bpo-33195: Deprecate ``Py_UNICODE`` usage in ``c-api/arg`` document.
26205   ``Py_UNICODE`` related APIs are deprecated since Python 3.3, but it is
26208 - bpo-33126: Document PyBuffer_ToContiguous().
26210 - bpo-27212: Modify documentation for the :func:`islice` recipe to consume
26213 - bpo-28247: Update :mod:`zipapp` documentation to describe how to make
26216 - bpo-18802: Documentation changes for ipaddress.  Patch by Jon Foster and
26219 - bpo-27428: Update documentation to clarify that ``WindowsRegistryFinder``
26222 - bpo-8243: Add a note about curses.addch and curses.addstr exception
26225 - bpo-31432: Clarify meaning of CERT_NONE, CERT_OPTIONAL, and CERT_REQUIRED
26229 -----
26231 - bpo-33655: Ignore test_posix_fallocate failures on BSD platforms that
26234 - bpo-19417: Add test_bdb.py.
26237 -----
26239 - bpo-5755: Move ``-Wstrict-prototypes`` option to ``CFLAGS_NODIST`` from
26243 - bpo-33614: Ensures module definition files for the stable ABI on Windows
26246 - bpo-33522: Enable CI builds on Visual Studio Team Services at
26249 - bpo-33012: Add ``-Wno-cast-function-type`` for gcc 8 for silencing
26253 - bpo-33394: Enable the verbose build for extension modules, when GNU make
26254   is passed macros on the command line.
26257 -------
26259 - bpo-33184: Update Windows installer to OpenSSL 1.0.2o.
26262 -----
26264 - bpo-33184: Update macOS installer build to use OpenSSL 1.0.2o.
26267 ----
26269 - bpo-33656: On Windows, add API call saying that tk scales for DPI. On
26274 - bpo-33768: Clicking on a context line moves that line to the top of the
26277 - bpo-33763: IDLE: Use read-only text widget for code context instead of
26280 - bpo-33664: Scroll IDLE editor text by lines. Previously, the mouse wheel
26283   the shell and grep output windows, but not to read-only text views.
26285 - bpo-33679: Enable theme-specific color configuration for Code Context. Use
26286   the Highlights tab to see the setting for built-in themes or add settings
26289 - bpo-33642: Display up to maxlines non-blank lines for Code Context. If
26290   there is no current context, show a single blank line.
26292 - bpo-33628: IDLE: Cleanup codecontext.py and its test.
26294 - bpo-33564: IDLE's code context now recognizes async as a block opener.
26296 - bpo-29706: IDLE now colors async and await as keywords in 3.6. They become
26299 - bpo-21474: Update word/identifier definition from ascii to unicode. In
26300   text and entry boxes, this affects selection by double-click, movement
26301   left/right by control-left/right, and deletion left/right by
26302   control-BACKSPACE/DEL.
26304 - bpo-33204: IDLE: consistently color invalid string prefixes. A 'u' string
26306   of the prefix, starting at the right, as is valid. Revise and extend
26309 - bpo-32831: Add docstrings and tests for codecontext.
26312 -----------
26314 - bpo-33189: :program:`pygettext.py` now recognizes only literal strings as
26316   f-string expressions.
26318 - bpo-31920: Fixed handling directories as arguments in the ``pygettext``
26321 - bpo-29673: Fix pystackv and pystack gdbinit macros.
26323 - bpo-32885: Add an ``-n`` flag for ``Tools/scripts/pathfix.py`` to disable
26326 - bpo-31583: Fix 2to3 for using with --add-suffix option but without
26327   --output-dir option for relative path to files in current directory.
26330 -----
26332 - bpo-32374: Document that m_traverse for multi-phase initialized modules
26339 *Release date: 2018-03-28*
26342 -----
26344 - bpo-32872: Avoid regrtest compatibility issue with namespace packages.
26347 -----
26349 - bpo-33163: Upgrade pip to 9.0.3 and setuptools to v39.0.1.
26355 *Release date: 2018-03-13*
26358 --------
26360 - bpo-33001: Minimal fix to prevent buffer overrun in os.symlink on Windows
26362 - bpo-32981: Regexes in difflib and poplib were vulnerable to catastrophic
26364   have been refactored. This resolves CVE-2018-1060 and CVE-2018-1061. Patch
26368 -----------------
26370 - bpo-33026: Fixed jumping out of "with" block by setting f_lineno.
26372 - bpo-17288: Prevent jumps from 'return' and 'exception' trace events.
26374 - bpo-32889: Update Valgrind suppression list to account for the rename of
26377 - bpo-32650: Pdb and other debuggers dependent on bdb.py will correctly step
26380 - bpo-32685: Improve suggestion when the Python 2 form of print statement is
26382   else terminated by a semi-colon instead of a newline. Patch by Nitish
26385 - bpo-32583: Fix possible crashing in builtin Unicode decoders caused by
26386   write out-of-bound errors when using customized decode error handlers.
26388 - bpo-26163: Improved frozenset() hash to create more distinct hash values
26391 - bpo-27169: The ``__debug__`` constant is now optimized out at compile
26392   time. This fixes also bpo-22091.
26394 - bpo-32329: ``sys.flags.hash_randomization`` is now properly set to 0 when
26395   hash randomization is turned off by ``PYTHONHASHSEED=0``.
26397 - bpo-30416: The optimizer is now protected from spending much time doing
26401 - bpo-18533: ``repr()`` on a dict containing its own ``values()`` or
26406 - bpo-32028: Leading whitespace is now correctly ignored when generating
26410 - bpo-32137: The repr of deeply nested dict now raises a RecursionError
26414 -------
26416 - bpo-33064: lib2to3 now properly supports trailing commas after ``*args``
26419 - bpo-31804: Avoid failing in multiprocessing.Process if the standard
26422 - bpo-33037: Skip sending/receiving data after SSL transport closing.
26424 - bpo-30353: Fix ctypes pass-by-value for structs on 64-bit Cygwin/MinGW.
26426 - bpo-33009: Fix inspect.signature() for single-parameter partialmethods.
26428 - bpo-32969: Expose several missing constants in zlib and fix corresponding
26431 - bpo-32713: Fixed tarfile.itn handling of out-of-bounds float values. Patch
26434 - bpo-30622: The ssl module now detects missing NPN support in LibreSSL.
26436 - bpo-32922: dbm.open() now encodes filename with the filesystem encoding
26439 - bpo-32859: In ``os.dup2``, don't check every call whether the ``dup3``
26442 - bpo-21060: Rewrite confusing message from setup.py upload from "No dist
26446 - bpo-32857: In :mod:`tkinter`, ``after_cancel(None)`` now raises a
26450 - bpo-32852: Make sure sys.argv remains as a list when running trace.
26452 - bpo-32841: Fixed `asyncio.Condition` issue which silently ignored
26456 - bpo-31787: Fixed refleaks of ``__init__()`` methods in various modules.
26459 - bpo-30157: Fixed guessing quote and delimiter in csv.Sniffer.sniff() when
26460   only the last field is quoted.  Patch by Jake Davis.
26462 - bpo-32394: socket: Remove TCP_FASTOPEN, TCP_KEEPCNT flags on older version
26463   Windows during run-time.
26465 - bpo-32777: Fix a rare but potential pre-exec child process deadlock in
26470 - bpo-32647: The ctypes module used to depend on indirect linking for
26471   dlopen. The shared extension is now explicitly linked against libdl on
26474 - bpo-32734: Fixed ``asyncio.Lock()`` safety issue which allowed acquiring
26478 - bpo-32727: Do not include name field in SMTP envelope from address. Patch
26481 - bpo-27931: Fix email address header parsing error when the username is an
26484 - bpo-32304: distutils' upload command no longer corrupts tar files ending
26488 - bpo-32502: uuid.uuid1 no longer raises an exception if a 64-bit hardware
26489   address is encountered.
26491 - bpo-31848: Fix the error handling in Aifc_read.initfp() when the SSND
26492   chunk is not found. Patch by Zackery Spytz.
26494 - bpo-32555: On FreeBSD and Solaris, os.strerror() now always decode the
26498 - bpo-32521: The nis module is now compatible with new libnsl and headers
26501 - bpo-32473: Improve ABCMeta._dump_registry() output readability
26503 - bpo-32521: glibc has removed Sun RPC. Use replacement libtirpc headers and
26506 - bpo-32228: Ensure that ``truncate()`` preserves the file position (as
26509 - bpo-26133: Don't unsubscribe signals in asyncio UNIX event loop on
26512 - bpo-32185: The SSL module no longer sends IP addresses in SNI TLS
26515 - bpo-32323: :func:`urllib.parse.urlsplit()` does not convert zone-id
26518 - bpo-32302: Fix bdist_wininst of distutils for CRT v142: it binary
26521 - bpo-32255: A single empty field is now always quoted when written into a
26525 - bpo-32277: Raise ``NotImplementedError`` instead of ``SystemError`` on
26526   platforms where ``chmod(..., follow_symlinks=False)`` is not supported.
26529 - bpo-32199: The getnode() ip getter now uses 'ip link' instead of 'ip link
26532 - bpo-27456: Ensure TCP_NODELAY is set on Linux. Tests by Victor Stinner.
26534 - bpo-31900: The :func:`locale.localeconv` function now sets temporarily the
26536   ``decimal_point`` and ``thousands_sep`` byte strings if they are non-ASCII
26537   or longer than 1 byte, and the ``LC_NUMERIC`` locale is different than the
26543 - bpo-31802: Importing native path module (``posixpath``, ``ntpath``) now
26544   works even if the ``os`` module still is not imported.
26547 -------------
26549 - bpo-17232: Clarify docs for -O and -OO.  Patch by Terry Reedy.
26551 - bpo-32800: Update link to w3c doc for xml default namespaces.
26553 - bpo-8722: Document :meth:`__getattr__` behavior when property :meth:`get`
26556 - bpo-32614: Modify RE examples in documentation to use raw strings to
26560 - bpo-31972: Improve docstrings for `pathlib.PurePath` subclasses.
26562 - bpo-17799: Explain real behaviour of sys.settrace and sys.setprofile and
26563   their C-API counterparts regarding which type of events are received in
26567 -----
26569 - bpo-32517: Fix failing ``test_asyncio`` on macOS 10.12.2+ due to transport
26572 - bpo-32721: Fix test_hashlib to not fail if the _md5 module is not built.
26574 - bpo-32252: Fix faulthandler_suppress_crash_report() used to prevent core
26577 - bpo-31518: Debian Unstable has disabled TLS 1.0 and 1.1 for
26582 -----
26584 - bpo-32635: Fix segfault of the crypt module when libxcrypt is provided
26588 -------
26590 - bpo-33016: Fix potential use of uninitialized memory in
26593 - bpo-32903: Fix a memory leak in os.chdir() on Windows if the current
26594   directory is set to a UNC path.
26596 - bpo-31966: Fixed WindowsConsoleIO.write() for writing empty data.
26598 - bpo-32409: Ensures activate.bat can handle Unicode contents.
26600 - bpo-32457: Improves handling of denormalized executable path when
26603 - bpo-32370: Use the correct encoding for ipconfig output in the uuid
26606 - bpo-29248: Fix :func:`os.readlink` on Windows, which was mistakenly
26610 - bpo-32588: Create standalone _distutils_findvs module.
26613 -----
26615 - bpo-32726: Provide an additional, more modern macOS installer variant that
26616   supports macOS 10.9+ systems in 64-bit mode only. Upgrade the supplied
26617   third-party libraries to OpenSSL 1.0.2n, XZ 5.2.3, and SQLite 3.22.0. The
26621 ----
26623 - bpo-32984: Set ``__file__`` while running a startup file.  Like Python,
26625   presenting the first interactive input prompt.  For IDLE, ``-s`` runs a
26627   :envvar:`PYTHONSTARTUP`; ``-r file`` runs ``file``.  Python sets
26630   without the ``-n`` option.
26632 - bpo-32940: Simplify and rename StringTranslatePseudoMapping in pyparse.
26634 - bpo-32916: Change ``str`` to ``code`` in pyparse.
26636 - bpo-32905: Remove unused code in pyparse module.
26638 - bpo-32874: Add tests for pyparse.
26640 - bpo-32837: Using the system and place-dependent default encoding for
26641   open() is a bad idea for IDLE's system and location-independent files.
26643 - bpo-32826: Add "encoding=utf-8" to open() in IDLE's test_help_about. GUI
26644   test test_file_buttons() only looks at initial ascii-only lines, but
26646   internally reads and decodes far enough ahead to encounter a non-ascii
26649 - bpo-32765: Update configdialog General tab docstring to add new widgets to
26653 -----------
26655 - bpo-24960: 2to3 and lib2to3 can now read pickled grammar files using
26659 - bpo-32222: Fix pygettext not extracting docstrings for functions with type
26663 -----
26665 - bpo-29084: Undocumented C API for OrderedDict has been excluded from the
26673 *Release date: 2017-12-18*
26682 *Release date: 2017-12-05*
26685 -----------------
26687 - bpo-32176: co_flags.CO_NOFREE is now always set correctly by the code
26693 - bpo-31949: Fixed several issues in printing tracebacks
26701 - bpo-30696: Fix the interactive interpreter looping endlessly when no
26704 - bpo-20047: Bytearray methods partition() and rpartition() now accept only
26705   bytes-like objects as separator, as documented.  In particular they now
26706   raise TypeError rather of returning a bogus result when an integer is
26709 - bpo-31852: Fix a segmentation fault caused by a combination of the async
26712 - bpo-21720: BytesWarning no longer emitted when the *fromlist* argument of
26716 - bpo-31825: Fixed OverflowError in the 'unicode-escape' codec and in
26717   codecs.escape_decode() when decode an escaped non-ascii byte.
26719 - bpo-28603: Print the full context/cause chain of exceptions on interpreter
26720   exit, even if an exception in the chain is unhashable or compares equal to
26723 - bpo-31786: Fix timeout rounding in the select module to round correctly
26724   negative timeouts between -1.0 and 0.0. The functions now block waiting
26725   for events as expected. Previously, the call was incorrectly non-blocking.
26728 - bpo-31642: Restored blocking "from package import module" by setting
26731 - bpo-31626: Fixed a bug in debug memory allocator.  There was a write to
26734 - bpo-31619: Fixed a ValueError when convert a string with large number of
26737 - bpo-31592: Fixed an assertion failure in Python parser in case of a bad
26740 - bpo-31588: Raise a `TypeError` with a helpful error message when class
26744 - bpo-31566: Fix an assertion failure in `_warnings.warn()` in case of a bad
26747 - bpo-31505: Fix an assertion failure in `json`, in case
26751 - bpo-31492: Fix assertion failures in case of failing to import from a
26755 - bpo-31490: Fix an assertion failure in `ctypes` class definition, in case
26756   the class has an attribute whose name is specified in ``_anonymous_`` but
26759 - bpo-31478: Fix an assertion failure in `_random.Random.seed()` in case the
26762 - bpo-31315: Fix an assertion failure in imp.create_dynamic(), when
26763   spec.name is not a string. Patch by Oren Milman.
26765 - bpo-31311: Fix a crash in the ``__setstate__()`` method of
26768 - bpo-31293: Fix crashes in true division and multiplication of a timedelta
26772 - bpo-31285: Fix an assertion failure in `warnings.warn_explicit`, when the
26776 - bpo-30817: `PyErr_PrintEx()` clears now the ignored exception that may be
26780 -------
26782 - bpo-28556: Two minor fixes for ``typing`` module: allow shallow copying
26786 - bpo-27240: The header folding algorithm for the new email policies has
26787   been rewritten, which also fixes bpo-30788, bpo-31831, and bpo-32182.  In
26788   particular, RFC2231 folding is now done correctly.
26790 - bpo-32186: io.FileIO.readall() and io.FileIO.read() now release the GIL
26794 - bpo-12239: Make :meth:`msilib.SummaryInformation.GetProperty` return
26795   ``None`` when the value of property is ``VT_EMPTY``.  Initial patch by
26798 - bpo-31325: Fix wrong usage of :func:`collections.namedtuple` in the
26802 - bpo-12382: :func:`msilib.OpenDatabase` now raises a better exception
26806 - bpo-32110: ``codecs.StreamReader.read(n)`` now returns not more than *n*
26807   characters/bytes for non-negative *n*. This makes it compatible with
26808   ``read()`` methods of other file-like objects.
26810 - bpo-32072: Fixed issues with binary plists: Fixed saving bytearrays.
26815 - bpo-32034: Make asyncio.IncompleteReadError and LimitOverrunError
26818 - bpo-32015: Fixed the looping of asyncio in the case of reconnection the
26821 - bpo-32011: Restored support of loading marshal files with the TYPE_INT64
26824 - bpo-31970: Reduce performance overhead of asyncio debug mode.
26826 - bpo-9678: Fixed determining the MAC address in the uuid module: Using
26830 - bpo-30057: Fix potential missed signal in signal.signal().
26832 - bpo-31933: Fix Blake2 params leaf_size and node_offset on big endian
26835 - bpo-31927: Fixed compilation of the socket module on NetBSD 8.  Fixed
26839 - bpo-27666: Fixed stack corruption in curses.box() and curses.ungetmouse()
26840   when the size of types chtype or mmask_t is less than the size of C long.
26844 - bpo-31897: plistlib now catches more errors when read binary plists and
26847 - bpo-25720: Fix the method for checking pad state of curses WINDOW. Patch
26850 - bpo-31893: Fixed the layout of the kqueue_event structure on OpenBSD and
26853 - bpo-31891: Fixed building the curses module on NetBSD.
26855 - bpo-28416: Instances of pickle.Pickler subclass with the persistent_id()
26859 - bpo-28326: Fix multiprocessing.Process when stdout and/or stderr is closed
26862 - bpo-31457: If nested log adapters are used, the inner ``process()``
26865 - bpo-31457: The ``manager`` property on LoggerAdapter objects is now
26868 - bpo-31806: Fix timeout rounding in time.sleep(), threading.Lock.acquire()
26870   between -1.0 and 0.0. The functions now block waiting for events as
26871   expected. Previously, the call was incorrectly non-blocking. Patch by
26874 - bpo-28603: traceback: Fix a TypeError that occurred during printing of
26876   its context/cause chain is unhashable. Patch by Zane Bitter.
26878 - bpo-30058: Fixed buffer overflow in select.kqueue.control().
26880 - bpo-31770: Prevent a crash when calling the ``__init__()`` method of a
26883 - bpo-31672: ``idpattern`` in ``string.Template`` matched some non-ASCII
26884   characters. Now it uses ``-i`` regular expression local flag to avoid
26885   non-ASCII characters.
26887 - bpo-31764: Prevent a crash in ``sqlite3.Cursor.close()`` in case the
26888   ``Cursor`` object is uninitialized. Patch by Oren Milman.
26890 - bpo-31752: Fix possible crash in timedelta constructor called with custom
26893 - bpo-31701: On Windows, faulthandler.enable() now ignores MSC and COM
26896 - bpo-31728: Prevent crashes in `_elementtree` due to unsafe cleanup of
26899 - bpo-31620: an empty asyncio.Queue now doesn't leak memory when queue.get
26902 - bpo-31632: Fix method set_protocol() of class _SSLProtocolTransport in
26906 - bpo-31675: Fixed memory leaks in Tkinter's methods splitlist() and split()
26909 - bpo-31673: Fixed typo in the name of Tkinter's method adderrorinfo().
26911 - bpo-30806: Fix the string representation of a netrc object.
26913 - bpo-15037: Added a workaround for getkey() in curses for ncurses 5.7 and
26916 - bpo-25351: Avoid venv activate failures with undefined variables
26918 - bpo-25532: inspect.unwrap() will now only try to unwrap an object
26922 - bpo-30347: Stop crashes when concurrently iterate over itertools.groupby()
26925 - bpo-31516: ``threading.current_thread()`` should not return a dummy thread
26928 - bpo-31351: python -m ensurepip now exits with non-zero exit code if pip
26931 - bpo-31482: ``random.seed()`` now works with bytes in version=1
26933 - bpo-31334: Fix ``poll.poll([timeout])`` in the ``select`` module for
26935   non-negative integer or -1. Patch by Riccardo Coccioli.
26937 - bpo-31310: multiprocessing's semaphore tracker should be launched again if
26940 - bpo-31308: Make multiprocessing's forkserver process immune to Ctrl-C and
26944 -------------
26946 - bpo-32105: Added asyncio.BaseEventLoop.connect_accepted_socket
26949 - bpo-31537: Fix incorrect usage of ``get_history_length`` in readline
26952 - bpo-30085: The operator functions without double underscores are preferred
26954   back-compatibility.
26957 -----
26959 - bpo-31380: Skip test_httpservers test_undecodable_file on macOS: fails on
26962 - bpo-31705: Skip test_socket.test_sha256() on Linux kernel older than 4.5.
26966 - bpo-31174: Fix test_tools.test_unparse: DirectoryTestCase now stores the
26970 - bpo-30695: Add the `set_nomemory(start, stop)` and `remove_mem_hooks()`
26974 -----
26976 - bpo-32059: ``detect_modules()`` in ``setup.py`` now also searches the
26977   sysroot paths when cross-compiling.
26979 - bpo-31957: Fixes Windows SDK version detection when building for Windows.
26981 - bpo-31609: Fixes quotes in PCbuild/clean.bat
26983 - bpo-31934: Abort the build when building out of a not clean source tree.
26985 - bpo-31926: Fixed Argument Clinic sometimes causing compilation errors when
26989 - bpo-28791: Update Windows builds to use SQLite 3.21.0.
26991 - bpo-28791: Update OS X installer to use SQLite 3.21.0.
26993 - bpo-22140: Prevent double substitution of prefix in python-config.sh.
26995 - bpo-31536: Avoid wholesale rebuild after `make regen-all` if nothing
26999 -------
27001 - bpo-1102: Return ``None`` when ``View.Fetch()`` returns
27005 - bpo-31944: Fixes Modify button in Apps and Features dialog.
27008 -----
27010 - bpo-31392: Update macOS installer to use OpenSSL 1.0.2m
27013 ----
27015 - bpo-32207: Improve tk event exception tracebacks in IDLE. When tk event
27016   handling is driven by IDLE's run loop, a confusing and distracting
27017   queue.EMPTY traceback context is no longer added to tk event exception
27018   tracebacks.  The traceback is now the same as when event handling is
27021 - bpo-32164: Delete unused file idlelib/tabbedpages.py. Use of TabbedPageSet
27024 - bpo-32100: IDLE: Fix old and new bugs in pathbrowser; improve tests. Patch
27027 - bpo-31858: IDLE -- Restrict shell prompt manipulation to the shell. Editor
27029   the code and fixes a minor bug when newline is inserted. Sys.ps1, if
27030   present, is read on Shell start-up, but is not set or changed.
27032 - bpo-31860: The font sample in the IDLE configuration dialog is now
27035 - bpo-31836: Test_code_module now passes if run after test_idle, which sets
27039 - bpo-28603: Fix a TypeError that caused a shell restart when printing a
27040   traceback that includes an exception that is unhashable. Patch by Zane
27043 - bpo-13802: Use non-Latin characters in the IDLE's Font settings sample.
27046   character. The expanded example give users of non-Latin characters a
27048   room for the expanded sample, frames on the Font tab are re-arranged. The
27051 - bpo-31460: Simplify the API of IDLE's Module Browser. Passing a widget
27053   browser frame that is only part of a window.  Passing a full file name
27057 - bpo-31649: IDLE - Make _htest, _utest parameters keyword only.
27059 - bpo-31559: Remove test order dependence in idle_test.test_browser.
27061 - bpo-31459: Rename IDLE's module browser from Class Browser to Module
27062   Browser. The original module-level class and method browser became a
27063   module browser, with the addition of module-level functions, years ago.
27065   back-compatibility, the virtual event <<open-class-browser>>, which
27066   appears on the Keys tab of the Settings dialog, is not changed. Patch by
27069 - bpo-31500: Default fonts now are scaled on HiDPI displays.
27071 - bpo-1612262: IDLE module browser now shows nested classes and functions.
27076 -----------
27078 - bpo-30722: Make redemo work with Python 3.6 and newer versions. Also,
27083 -----
27085 - bpo-20891: Fix PyGILState_Ensure(). When PyGILState_Ensure() is called in
27086   a non-Python thread before PyEval_InitThreads(), only call
27089 - bpo-31532: Fix memory corruption due to allocator mix in getpath.c between
27092 - bpo-30697: The `PyExc_RecursionErrorInst` singleton is removed and
27093   `PyErr_NormalizeException()` does not use it anymore. This singleton is
27101 *Release date: 2017-10-03*
27104 -------
27106 - bpo-31641: Re-allow arbitrary iterables in
27110 -----
27112 - bpo-31662: Fix typos in Windows ``uploadrelease.bat`` script. Fix Windows
27115 - bpo-31423: Fix building the PDF documentation with newer versions of
27122 *Release date: 2017-09-18*
27125 --------
27127 - bpo-29781: SSLObject.version() now correctly returns None when handshake
27130 - bpo-30947: Upgrade libexpat embedded copy from version 2.2.1 to 2.2.3 to
27134 -----------------
27136 - bpo-31471: Fix an assertion failure in `subprocess.Popen()` on Windows, in
27139 - bpo-31418: Fix an assertion failure in `PyErr_WriteUnraisable()` in case
27142 - bpo-31416: Fix assertion failures in case of a bad warnings.filters or
27145 - bpo-31411: Raise a TypeError instead of SystemError in case
27146   warnings.onceregistry is not a dictionary. Patch by Oren Milman.
27148 - bpo-31373: Fix several possible instances of undefined behavior due to
27149   floating-point demotions.
27151 - bpo-30465: Location information (``lineno`` and ``col_offset``) in
27152   f-strings is now (mostly) correct.  This fixes tools like flake8 from
27155 - bpo-31343: Include sys/sysmacros.h for major(), minor(), and makedev().
27158 - bpo-31291: Fix an assertion failure in `zipimport.zipimporter.get_data` on
27162 - bpo-31271: Fix an assertion failure in the write() method of
27166 - bpo-31243: Fix a crash in some methods of `io.TextIOWrapper`, when the
27167   decoder's state is invalid. Patch by Oren Milman.
27169 - bpo-30721: ``print`` now shows correct usage hint for using Python 2
27172 - bpo-31070: Fix a race condition in importlib _get_module_lock().
27174 - bpo-31095: Fix potential crash during GC caused by ``tp_dealloc`` which
27177 - bpo-31071: Avoid masking original TypeError in call with * unpacking when
27180 - bpo-30978: str.format_map() now passes key lookup exceptions through.
27183 - bpo-30808: Use _Py_atomic API for concurrency-sensitive signal state.
27185 - bpo-30876: Relative import from unloaded package now reimports the package
27186   instead of failing with SystemError.  Relative import from non-package now
27189 - bpo-30703: Improve signal delivery. Avoid using Py_AddPendingCall from
27190   signal handler, to avoid calling signal-unsafe functions. The tests I'm
27194 - bpo-30765: Avoid blocking in pthread_mutex_lock() when
27195   PyThread_acquire_lock() is asked not to block.
27197 - bpo-31161: Make sure the 'Missing parentheses' syntax error message is
27200 - bpo-30814: Fixed a race condition when import a submodule from a package.
27202 - bpo-30597: ``print`` now shows expected input in custom error message when
27206 -------
27208 - bpo-31499: xml.etree: Fix a crash when a parser is part of a reference
27211 - bpo-28556: typing.get_type_hints now finds the right globalns for classes
27214 - bpo-28556: Speed improvements to the ``typing`` module.  Original PRs by
27217 - bpo-31544: The C accelerator module of ElementTree ignored exceptions
27220 - bpo-31234: socket.create_connection() now fixes manually a reference
27223 - bpo-31457: LoggerAdapter objects can now be nested.
27225 - bpo-31400: Improves SSL error handling to avoid losing error numbers.
27227 - bpo-28958: ssl.SSLContext() now uses OpenSSL error information when a
27230 - bpo-27340: SSLSocket.sendall() now uses memoryview to create slices of
27231   data. This fixes support for all bytes-like object. It is also more
27234 - bpo-31178: Fix string concatenation bug in rare error path in the
27237 - bpo-31350: Micro-optimize :func:`asyncio._get_running_loop` to become up
27240 - bpo-31170: expat: Update libexpat from 2.2.3 to 2.2.4. Fix copying of
27241   partial characters for UTF-8 input (libexpat bug 115):
27244 - bpo-29136: Add TLS 1.3 cipher suites and OP_NO_TLSv1_3.
27246 - bpo-29212: Fix concurrent.futures.thread.ThreadPoolExecutor threads to
27248   is supplied. They will now identify themselves as
27249   "ThreadPoolExecutor-y_n".
27251 - bpo-9146: Fix a segmentation fault in _hashopenssl when standard hash
27253   in some special FIPS-140 build environments.
27255 - bpo-27144: The ``map()`` and ``as_completed()`` iterators in
27258 - bpo-10746: Fix ctypes producing wrong :pep:`3118` type codes for integer
27261 - bpo-22536: The subprocess module now sets the filename when
27262   FileNotFoundError is raised on POSIX systems due to the executable or cwd
27265 - bpo-31249: concurrent.futures: WorkItem.run() used by ThreadPoolExecutor
27269 - bpo-31247: xmlrpc.server now explicitly breaks reference cycles when using
27272 - bpo-30102: The ssl and hashlib modules now call
27275   such as POWER8. Patch is based on research from Gustavo Serra Scalet.
27277 - bpo-31185: Fixed miscellaneous errors in asyncio speedup module.
27279 - bpo-31135: ttk: fix the destroy() method of LabeledScale and OptionMenu
27285 - bpo-31107: Fix `copyreg._slotnames()` mangled attribute calculation for
27288 - bpo-31061: Fixed a crash when using asyncio and threads.
27290 - bpo-30502: Fix handling of long oids in ssl.  Based on patch by Christian
27293 - bpo-30119: ftplib.FTP.putline() now throws ValueError on commands that
27294   contains CR or LF. Patch by Dong-hee Na.
27296 - bpo-30595: multiprocessing.Queue.get() with a timeout now polls its reader
27297   in non-blocking mode if it succeeded to acquire the lock but the acquire
27300 - bpo-29403: Fix ``unittest.mock``'s autospec to not fail on method-bound
27303 - bpo-30961: Fix decrementing a borrowed reference in tracemalloc.
27305 - bpo-25684: Change ``ttk.OptionMenu`` radiobuttons to be unique across
27308 - bpo-30886: Fix multiprocessing.Queue.join_thread(): it now waits until the
27312 - bpo-29854: Fix segfault in readline when using readline's history-size
27315 - bpo-30319: socket.close() now ignores ECONNRESET error.
27317 - bpo-30828: Fix out of bounds write in
27320 - bpo-30807: signal.setitimer() may disable the timer when passed a tiny
27321   value. Tiny values (such as 1e-6) are valid non-zero values for
27322   setitimer(), which is specified as taking microsecond-resolution
27324   1e-6 into a zero interval, therefore disabling the timer instead of
27325   (re-)scheduling it.
27327 - bpo-30441: Fix bug when modifying os.environ while iterating over it
27329 - bpo-30532: Fix email header value parser dropping folding white space in
27332 - bpo-30879: os.listdir() and os.scandir() now emit bytes names when called
27333   with bytes-like argument.
27335 - bpo-30746: Prohibited the '=' character in environment variable names in
27338 - bpo-29755: Fixed the lgettext() family of functions in the gettext module.
27342 -------------
27344 - bpo-31294: Fix incomplete code snippet in the ZeroMQSocketListener and
27347 - bpo-21649: Add RFC 7525 and Mozilla server side TLS links to SSL
27350 - bpo-30803: Clarify doc on truth value testing. Original patch by Peter
27354 -----
27356 - bpo-31320: Silence traceback in test_ssl
27358 - bpo-25674: Remove sha256.tbs-internet.com ssl test
27360 - bpo-30715: Address ALPN callback changes for OpenSSL 1.1.0f. The latest
27363 - bpo-30822: regrtest: Exclude tzdata from regrtest --all. When running the
27364   test suite using --use=all / -u all, exclude tzdata since it makes
27365   test_datetime too slow (15-20 min on some buildbots) which then times out
27367   -u extralargefile to run test_zipfile64.
27370 -----
27372 - bpo-30854: Fix compile error when compiling --without-threads. Patch by
27376 -------
27378 - bpo-30389: Adds detection of Visual Studio 2017 to distutils on Windows.
27380 - bpo-31340: Change to building with MSVC v141 (included with Visual Studio
27383 - bpo-30581: os.cpu_count() now returns the correct number of processors on
27384   Windows when the number of logical processors is greater than 64.
27386 - bpo-30731: Add a missing xmlns to python.manifest so that it matches the
27390 ----
27392 - bpo-31493: IDLE code context -- fix code update and font update timers.
27395 - bpo-31488: IDLE - Update non-key options in former extension classes. When
27400 - bpo-31477: IDLE - Improve rstrip entry in doc. Strip trailing whitespace
27403 - bpo-31480: IDLE - make tests pass with zzdummy extension disabled by
27406 - bpo-31421: Document how IDLE runs tkinter programs. IDLE calls tcl/tk
27410 - bpo-31414: IDLE -- fix tk entry box tests by deleting first. Adding to an
27411   int entry is not the same as deleting and inserting because int('') will
27414 - bpo-31051: Rearrange IDLE configdialog GenPage into Window, Editor, and
27417 - bpo-30617: IDLE - Add docstrings and tests for outwin subclass of editor.
27421 - bpo-31287: IDLE - Do not modify tkinter.message in test_configdialog.
27423 - bpo-27099: Convert IDLE's built-in 'extensions' to regular features. About
27426   maintenance. Hence the conversion. The main difference for users is that
27429   the keyset. All bindings are defined together in the system-specific
27430   default keysets in config-extensions.def. All custom keysets are saved as
27431   a whole in config-extension.cfg.  All take effect as soon as one clicks
27432   Apply or Ok. The affected events are '<<force-open-completions>>',
27433   '<<expand-word>>', '<<force-open-calltip>>', '<<flash-paren>>',
27434   '<<format-paragraph>>', '<<run-module>>', '<<check-module>>', and
27435   '<<zoom-height>>'.  Any (global) customizations made before 3.6.3 will not
27436   affect their keyset-specific customization after 3.6.3. and vice versa.
27439 - bpo-31206: IDLE: Factor HighPage(Frame) class from ConfigDialog. Patch by
27442 - bpo-31001: Add tests for configdialog highlight tab.  Patch by Cheryl
27445 - bpo-31205: IDLE: Factor KeysPage(Frame) class from ConfigDialog.  The
27448 - bpo-31130: IDLE -- stop leaks in test_configdialog. Initial patch by
27451 - bpo-31002: Add tests for configdialog keys tab. Patch by Cheryl Sabella.
27453 - bpo-19903: IDLE: Calltips use `inspect.signature` instead of
27457 - bpo-31083: IDLE - Add an outline of a TabPage class in configdialog.
27460 - bpo-31050: Factor GenPage(Frame) class from ConfigDialog. The slightly
27463 - bpo-31004: IDLE - Factor FontPage(Frame) class from ConfigDialog. Slightly
27467 - bpo-30781: IDLE - Use ttk widgets in ConfigDialog. Patches by Terry Jan
27470 - bpo-31060: IDLE - Finish rearranging methods of ConfigDialog Grouping
27474 - bpo-30853: IDLE -- Factor a VarTrace class out of ConfigDialog. Instance
27476   When tracing is turned on, setting the variable calls the function.  Test
27477   coverage for the new class is 100%.
27479 - bpo-31003: IDLE: Add more tests for General tab.
27481 - bpo-30993: IDLE - Improve configdialog font page and tests. In
27492 - bpo-30981: IDLE -- Add more configdialog font page tests.
27494 - bpo-28523: IDLE: replace 'colour' with 'color' in configdialog.
27496 - bpo-30917: Add tests for idlelib.config.IdleConf. Increase coverage from
27499 - bpo-30934: Document coverage details for idlelib tests. Add section to
27500   idlelib/idle-test/README.txt. Include check that branches are taken both
27501   ways. Exclude IDLE-specific code that does not run during unit tests.
27503 - bpo-30913: IDLE: Document ConfigDialog tk Vars, methods, and widgets in
27507 - bpo-30899: IDLE: Add tests for ConfigParser subclasses in config. Patch by
27510 - bpo-30881: IDLE: Add docstrings to browser.py. Patch by Cheryl Sabella.
27512 - bpo-30851: IDLE: Remove unused variables in configdialog.  One is a
27513   duplicate, one is set but cannot be altered by users. Patch by Cheryl
27516 - bpo-30870: IDLE: In Settings dialog, select font with Up, Down keys as
27519 - bpo-8231: IDLE: call config.IdleConf.GetUserCfgDir only once.
27521 - bpo-30779: IDLE: Factor ConfigChanges class from configdialog, put in
27531 - bpo-30777: IDLE: configdialog - Add docstrings and fix comments. Patch by
27534 - bpo-30495: IDLE: Improve textview with docstrings, PEP8 names, and more
27537 - bpo-30723: IDLE: Make several improvements to parenmatch. Add 'parens'
27538   style to highlight both opener and closer. Make 'default' style, which is
27539   not default, a synonym for 'opener'. Make time-delay work the same with
27543 - bpo-30674: IDLE: add docstrings to grep module. Patch by Cheryl Sabella
27545 - bpo-21519: IDLE's basic custom key entry dialog now detects duplicates
27548 - bpo-29910: IDLE no longer deletes a character after commenting out a
27552 - bpo-30728: Review and change idlelib.configdialog names. Lowercase method
27557 - bpo-6739: IDLE: Verify user-entered key sequences by trying to bind them
27562 -----------
27564 - bpo-30983: gdb integration commands (py-bt, etc.) work on optimized shared
27566   inlines PyEval_EvalFrameEx on non-debug shared builds.  This broke the
27567   ability to use py-bt, py-up, and a few other Python-specific gdb
27568   integrations. The problem is fixed by only looking for
27569   _PyEval_EvalFrameDefault frames in python-gdb.py.  Original patch by Bruno
27576 *Release date: 2017-07-17*
27585 *Release date: 2017-07-07*
27588 --------
27590 - bpo-30730: Prevent environment variables injection in subprocess on
27594 - bpo-30694: Upgrade expat copy from 2.2.0 to 2.2.1 to get fixes of multiple
27595   security vulnerabilities including: CVE-2017-9233 (External entity
27596   infinite loop DoS), CVE-2016-9063 (Integer overflow, re-fix),
27597   CVE-2016-0718 (Fix regression bugs from 2.2.0's fix to CVE-2016-0718) and
27598   CVE-2012-0876 (Counter hash flooding with SipHash). Note: the
27599   CVE-2016-5300 (Use os-specific entropy sources like getrandom) doesn't
27603 - bpo-30500: Fix urllib.parse.splithost() to correctly parse fragments. For
27612 *Release date: 2017-06-17*
27615 --------
27617 - bpo-29591: Update expat copy from 2.1.1 to 2.2.0 to get fixes of
27618   CVE-2016-0718 and CVE-2016-4472. See
27622 -----------------
27624 - bpo-30682: Removed a too-strict assertion that failed for certain
27625   f-strings, such as eval("f'\\\n'") and eval("f'\\\r'").
27627 - bpo-30604: Move co_extra_freefuncs to not be per-thread to avoid crashes
27629 - bpo-29104: Fixed parsing backslashes in f-strings.
27631 - bpo-27945: Fixed various segfaults with dict when input collections are
27635 - bpo-25794: Fixed type.__setattr__() and type.__delattr__() for
27636   non-interned attribute names.  Based on patch by Eryk Sun.
27638 - bpo-30039: If a KeyboardInterrupt happens when the interpreter is in the
27642 - bpo-12414: sys.getsizeof() on a code object now returns the sizes which
27644   by Dong-hee Na.
27646 - bpo-29949: Fix memory usage regression of set and frozenset object.
27648 - bpo-29935: Fixed error messages in the index() method of tuple, list and
27651 - bpo-29859: Show correct error messages when any of the pthread_* calls in
27654 - bpo-28876: ``bool(range)`` works even if ``len(range)`` raises
27657 - bpo-29600: Fix wrapping coroutine return values in StopIteration.
27659 - bpo-28856: Fix an oversight that %b format for bytes should support
27662 - bpo-29714: Fix a regression that bytes format may fail when containing
27665 - bpo-29478: If max_line_length=None is specified while using the Compat32
27666   policy, it is no longer ignored.  Patch by Mircea Cosbuc.
27669 -------
27671 - bpo-30616: Functional API of enum allows to create empty enums. Patched by
27672   Dong-hee Na
27674 - bpo-30038: Fix race condition between signal delivery and wakeup file
27677 - bpo-23894: lib2to3 now recognizes ``rb'...'`` and ``f'...'`` strings.
27679 - bpo-23890: unittest.TestCase.assertRaises() now manually breaks a
27682 - bpo-30149: inspect.signature() now supports callables with
27683   variable-argument parameters wrapped with partialmethod. Patch by Dong-hee
27686 - bpo-30645: Fix path calculation in imp.load_package(), fixing it for cases
27687   when a package is only shipped with bytecodes. Patch by Alexandru
27690 - bpo-29931: Fixed comparison check for ipaddress.ip_interface objects.
27693 - bpo-30605: re.compile() no longer raises a BytesWarning when compiling a
27696 - bpo-24484: Avoid race condition in multiprocessing cleanup (#2159)
27698 - bpo-28994: The traceback no longer displayed for SystemExit raised in a
27701 - bpo-30508: Don't log exceptions if Task/Future "cancel()" method was
27704 - bpo-28556: Updates to typing module: Add generic AsyncContextManager, add
27708 - bpo-29870: Fix ssl sockets leaks when connection is aborted in asyncio/ssl
27711 - bpo-29743: Closing transport during handshake process leaks open socket.
27714 - bpo-27585: Fix waiter cancellation in asyncio.Lock. Patch by Mathieu
27717 - bpo-30418: On Windows, subprocess.Popen.communicate() now also ignore
27718   EINVAL on stdin.write() if the child process is still running but closed
27721 - bpo-29822: inspect.isabstract() now works during __init_subclass__.  Patch
27724 - bpo-29581: ABCMeta.__new__ now accepts ``**kwargs``, allowing abstract
27728 - bpo-30557: faulthandler now correctly filters and displays exception codes
27731 - bpo-30378: Fix the problem that logging.handlers.SysLogHandler cannot
27734 - bpo-29960: Preserve generator state when _random.Random.setstate() raises
27737 - bpo-30414: multiprocessing.Queue._feed background running thread do not
27740 - bpo-30003: Fix handling escape characters in HZ codec.  Based on patch by
27743 - bpo-30301: Fix AttributeError when using SimpleQueue.empty() under *spawn*
27746 - bpo-30329: imaplib and poplib now catch the Windows socket WSAEINVAL error
27750 - bpo-30375: Warnings emitted when compile a regular expression now always
27754 - bpo-30048: Fixed ``Task.cancel()`` can be ignored when the task is running
27757 - bpo-30266: contextlib.AbstractContextManager now supports
27758   anti-registration by setting __enter__ = None or __exit__ = None,
27759   following the pattern introduced in bpo-25958. Patch by Jelle Zijlstra.
27761 - bpo-30298: Weaken the condition of deprecation warnings for inline
27767 - bpo-29990: Fix range checking in GB18030 decoder.  Original patch by Ma
27770 - bpo-26293: Change resulted because of zipfile breakage. (See also:
27771   bpo-29094)
27773 - bpo-30243: Removed the __init__ methods of _json's scanner and encoder.
27777 - bpo-30185: Avoid KeyboardInterrupt tracebacks in forkserver helper process
27778   when Ctrl-C is received.
27780 - bpo-28556: Various updates to typing module: add typing.NoReturn type, use
27781   WrapperDescriptorType, minor bug-fixes.  Original PRs by Jim
27782   Fasarakis-Hilliard and Ivan Levkivskyi.
27784 - bpo-30205: Fix getsockname() for unbound AF_UNIX sockets on Linux.
27786 - bpo-30070: Fixed leaks and crashes in errors handling in the parser
27789 - bpo-30061: Fixed crashes in IOBase methods __next__() and readlines() when
27790   readline() or __next__() respectively return non-sizeable object. Fixed
27794 - bpo-30017: Allowed calling the close() method of the zip entry writer
27798 - bpo-30068: _io._IOBase.readlines will check if it's closed first when hint
27799   is present.
27801 - bpo-29694: Fixed race condition in pathlib mkdir with flags parents=True.
27804 - bpo-29692: Fixed arbitrary unchaining of RuntimeError exceptions in
27807 - bpo-29998: Pickling and copying ImportError now preserves name and path
27810 - bpo-29953: Fixed memory leaks in the replace() method of datetime and time
27813 - bpo-29942: Fix a crash in itertools.chain.from_iterable when encountering
27816 - bpo-27863: Fixed multiple crashes in ElementTree caused by race conditions
27819 - bpo-28699: Fixed a bug in pools in multiprocessing.pool that raising an
27823 - bpo-25803: Avoid incorrect errors raised by Path.mkdir(exist_ok=True) when
27826 - bpo-29861: Release references to tasks, their arguments and their results
27829 - bpo-29884: faulthandler: Restore the old sigaltstack during teardown.
27832 - bpo-25455: Fixed crashes in repr of recursive buffered file-like objects.
27834 - bpo-29800: Fix crashes in partial.__repr__ if the keys of partial.keywords
27837 - bpo-29742: get_extra_info() raises exception if get called on closed ssl
27840 - bpo-8256: Fixed possible failing or crashing input() if attributes
27844 - bpo-28298: Fix a bug that prevented array 'Q', 'L' and 'I' from accepting
27848 - bpo-28231: The zipfile module now accepts path-like objects for external
27851 - bpo-26915: index() and count() methods of collections.abc.Sequence now
27854 - bpo-29615: SimpleXMLRPCDispatcher no longer chains KeyError (or any other
27858 - bpo-30177: path.resolve(strict=False) no longer cuts the path after the
27862 ----
27864 - bpo-15786: Fix several problems with IDLE's autocompletion box. The
27869 - bpo-25514: Add doc subsubsection about IDLE failure to start. Popup
27870   no-connection message directs users to this section.
27872 - bpo-30642: Fix reference leaks in IDLE tests. Patches by Louie Lu and
27875 - bpo-30495: Add docstrings for textview.py and use PEP8 names. Patches by
27878 - bpo-30290: Help-about: use pep8 names and add tests. Increase coverage to
27881 - bpo-30303: Add _utest option to textview; add new tests. Increase coverage
27885 -----
27887 - bpo-27867: Function PySlice_GetIndicesEx() no longer replaced with a macro
27888   if Py_LIMITED_API is not set.
27891 -----
27893 - bpo-29941: Add ``--with-assertions`` configure flag to explicitly enable C
27894   ``assert()`` checks. Defaults to off. ``--with-pydebug`` implies
27895   ``--with-assertions``.
27897 - bpo-28787: Fix out-of-tree builds of Python when configured with
27898   ``--with--dtrace``.
27900 - bpo-29243: Prevent unnecessary rebuilding of Python during ``make test``,
27902   ``--enable-optimizations``.
27904 - bpo-23404: Don't regenerate generated files based on file modification
27905   time anymore: the action is now explicit. Replace ``make touch`` with
27906   ``make regen-all``.
27908 - bpo-29643: Fix ``--enable-optimization`` didn't work.
27911 -------------
27913 - bpo-30176: Add missing attribute related constants in curses
27916 - bpo-30052: the link targets for :func:`bytes` and :func:`bytearray` are
27918   builtin function entries. Use :ref:`bytes <func-bytes>` and
27919   :ref:`bytearray <func-bytearray>` to reference the latter. In order to
27920   ensure this and future cross-reference updates are applied automatically,
27924 - bpo-26985: Add missing info of code object in inspect documentation.
27927 -----------
27929 - bpo-29367: python-gdb.py now supports also ``method-wrapper``
27933 -----
27935 - bpo-30357: test_thread: setUp() now uses support.threading_setup() and
27940 - bpo-30197: Enhanced functions swap_attr() and swap_item() in the
27944   clause, if there is one.
27947 -------
27949 - bpo-30687: Locate msbuild.exe on Windows when building rather than
27952 - bpo-30450: The build process on Windows no longer depends on Subversion,
27954   3.6 is not found on the system (via ``py -3.6``), NuGet is used to
27955   download a copy of 32-bit Python.
27961 *Release date: 2017-03-21*
27964 -----------------
27966 - bpo-29723: The ``sys.path[0]`` initialization change for bpo-29139 caused
27967   a regression by revealing an inconsistency in how sys.path is initialized
27975 -----
27977 - bpo-27593: fix format of git information used in sys.version
27979 - Fix incompatible comment in python.h
27985 *Release date: 2017-03-04*
27988 -----------------
27990 - bpo-28893: Set correct __cause__ for errors about invalid awaitables
27993 - bpo-29683: Fixes to memory allocation in _PyCode_SetExtra.  Patch by Brian
27996 - bpo-29684: Fix minor regression of PyEval_CallObjectWithKeywords. It
27997   should raise TypeError when kwargs is not a dict.  But it might cause segv
27998   when args=NULL and kwargs is not a dict.
28000 - bpo-28598: Support __rmod__ for subclasses of str being called before
28003 - bpo-29607: Fix stack_effect computation for CALL_FUNCTION_EX. Patch by
28006 - bpo-29602: Fix incorrect handling of signed zeros in complex constructor
28010 - bpo-29347: Fixed possibly dereferencing undefined pointers when creating
28013 - bpo-29438: Fixed use-after-free problem in key sharing dict.
28015 - bpo-29319: Prevent RunMainFromImporter overwriting sys.path[0].
28017 - bpo-29337: Fixed possible BytesWarning when compare the code objects.
28020 - bpo-29327: Fixed a crash when pass the iterable keyword argument to
28023 - bpo-29034: Fix memory leak and use-after-free in os module
28026 - bpo-29159: Fix regression in bytes(x) when x.__index__() raises Exception.
28028 - bpo-28932: Do not include <sys/random.h> if it does not exist.
28030 - bpo-25677: Correct the positioning of the syntax error caret for indented
28033 - bpo-29000: Fixed bytes formatting of octals with zero padding in alternate
28036 - bpo-26919: On Android, operating system data is now always encoded/decoded
28037   to/from UTF-8, instead of the locale encoding to avoid inconsistencies
28038   with os.fsencode() and os.fsdecode() which are already using UTF-8.
28040 - bpo-28991: functools.lru_cache() was susceptible to an obscure reentrancy
28041   bug triggerable by a monkey-patched len() function.
28043 - bpo-28739: f-string expressions are no longer accepted as docstrings and
28046 - bpo-28512: Fixed setting the offset attribute of SyntaxError by
28049 - bpo-28918: Fix the cross compilation of xxlimited when Python has been
28052 - bpo-28731: Optimize _PyDict_NewPresized() to create correct size dict.
28056 -------
28058 - bpo-29169: Update zlib to 1.2.11.
28060 - bpo-29623: Allow use of path-like object as a single argument in
28063 - bpo-28963: Fix out of bound iteration in
28066 - bpo-29704: asyncio.subprocess.SubprocessStreamProtocol no longer closes
28069 - bpo-29271: Fix Task.current_task and Task.all_tasks implemented in C to
28072 - bpo-29703: Fix asyncio to support instantiation of new event loops in
28075 - bpo-29376: Fix assertion error in threading._DummyThread.is_alive().
28077 - bpo-28624: Add a test that checks that cwd parameter of Popen() accepts
28080 - bpo-28518: Start a transaction implicitly before a DML statement. Patch by
28083 - bpo-29532: Altering a kwarg dictionary passed to functools.partial() no
28086 - bpo-29110: Fix file object leak in aifc.open() when file is given as a
28087   filesystem path and is not in valid AIFF format. Patch by Anthony Zhang.
28089 - bpo-28556: Various updates to typing module: typing.Counter,
28093 - bpo-29100: Fix datetime.fromtimestamp() regression introduced in Python
28096 - bpo-29519: Fix weakref spewing exceptions during interpreter shutdown when
28099 - bpo-29416: Prevent infinite loop in pathlib.Path.mkdir
28101 - bpo-29444: Fixed out-of-bounds buffer access in the group() method of the
28104 - bpo-29335: Fix subprocess.Popen.wait() when the child process has exited
28107 - bpo-29290: Fix a regression in argparse that help messages would wrap at
28108   non-breaking spaces.
28110 - bpo-28735: Fixed the comparison of mock.MagickMock with mock.ANY.
28112 - bpo-29316: Restore the provisional status of typing module, add
28115 - bpo-29219: Fixed infinite recursion in the repr of uninitialized
28118 - bpo-29011: Fix an important omission by adding Deque to the typing module.
28120 - bpo-28969: Fixed race condition in C implementation of
28125 - bpo-29142: In urllib.request, suffixes in no_proxy environment variable
28129 - bpo-28961: Fix unittest.mock._Call helper: don't ignore the name parameter
28132 - bpo-29203: functools.lru_cache() now respects :pep:`468` and preserves the
28133   order of keyword arguments.  f(a=1, b=2) is now cached separately from
28136 - bpo-15812: inspect.getframeinfo() now correctly shows the first line of a
28139 - bpo-29094: Offsets in a ZIP file created with extern file object and modes
28142 - bpo-29085: Allow random.Random.seed() to use high quality OS randomness
28145 - bpo-29061: Fixed bug in secrets.randbelow() which would hang when given a
28148 - bpo-29079: Prevent infinite loop in pathlib.resolve() on Windows
28150 - bpo-13051: Fixed recursion errors in large or resized
28153 - bpo-29119: Fix weakrefs in the pure python version of
28157 - bpo-9770: curses.ascii predicates now work correctly with negative
28160 - bpo-28427: old keys should not remove new values from WeakValueDictionary
28163 - bpo-28923: Remove editor artifacts from Tix.py.
28165 - bpo-29055: Neaten-up empty population error on random.choice() by
28168 - bpo-28871: Fixed a crash when deallocate deep ElementTree.
28170 - bpo-19542: Fix bugs in WeakValueDictionary.setdefault() and
28173 - bpo-20191: Fixed a crash in resource.prlimit() when passing a sequence
28176 - bpo-28779: multiprocessing.set_forkserver_preload() would crash the
28180 - bpo-28847: dbm.dumb now supports reading read-only files and no longer
28181   writes the index file when it is not changed.
28183 - bpo-26937: The chown() method of the tarfile.TarFile class does not fail
28188 ----
28190 - bpo-29071: IDLE colors f-string prefixes (but not invalid ur prefixes).
28192 - bpo-28572: Add 10% to coverage of IDLE's test_configdialog. Update and
28196 -------
28198 - bpo-29579: Removes readme.txt from the installer
28200 - bpo-29326: Ignores blank lines in ._pth files (Patch by Alexey Izbyshev)
28202 - bpo-28164: Correctly handle special console filenames (patch by Eryk Sun)
28204 - bpo-29409: Implement :pep:`529` for io.FileIO (Patch by Eryk Sun)
28206 - bpo-29392: Prevent crash when passing invalid arguments into msvcrt
28209 - bpo-25778: winreg does not truncate string correctly (Patch by Eryk Sun)
28211 - bpo-28896: Deprecate WindowsRegistryFinder and disable it by default.
28214 -----
28216 - bpo-27867: Function PySlice_GetIndicesEx() is replaced with a macro if
28217   Py_LIMITED_API is not set or set to the value between 0x03050400 and
28220 - bpo-29083: Fixed the declaration of some public API functions.
28224   PY_SSIZE_T_CLEAN is defined.
28226 - bpo-29058: All stable API extensions added after Python 3.2 are now
28227   available only when Py_LIMITED_API is set to the PY_VERSION_HEX value of
28231 -------------
28233 - bpo-28929: Link the documentation to its source file on GitHub.
28235 - bpo-25008: Document smtpd.py as effectively deprecated and add a pointer
28236   to aiosmtpd, a third-party asyncio-based replacement.
28238 - bpo-26355: Add canonical header link on each page to corresponding major
28241 - bpo-29349: Fix Python 2 syntax in code for building the documentation.
28244 -----
28246 - bpo-28087: Skip test_asyncore and test_eintr poll failures on macOS. Skip
28250 - bpo-29571: to match the behaviour of the ``re.LOCALE`` flag,
28253   correctly skip the test when the default locale encoding is a multi-byte
28256 - bpo-28950: Disallow -j0 to be combined with -T/-l in regrtest command line
28259 - bpo-28683: Fix the tests that bind() a unix socket and raise
28260   PermissionError on Android for a non-root user.
28262 - bpo-26939: Add the support.setswitchinterval() function to fix
28266 -----
28268 - bpo-27593: sys.version and the platform module python_build(),
28272 - bpo-29572: Update Windows build and OS X installers to use OpenSSL 1.0.2k.
28274 - bpo-26851: Set Android compilation and link flags.
28276 - bpo-28768: Fix implicit declaration of function _setmode. Patch by
28279 - bpo-29080: Removes hard dependency on hg.exe from PCBuild/build.bat
28281 - bpo-23903: Added missed names to PC/python3.def.
28283 - bpo-28762: lockf() is available on Android API level 24, but the F_LOCK
28284   macro is not defined in android-ndk-r13.
28286 - bpo-28538: Fix the compilation error that occurs because if_nameindex() is
28287   available on Android API level 24, but the if_nameindex structure is not
28290 - bpo-20211: Do not add the directory for installing C header files and the
28294 - bpo-28849: Do not define sys.implementation._multiarch on Android.
28300 *Release date: 2016-12-23*
28309 *Release date: 2016-12-16*
28312 -----------------
28314 - bpo-28147: Fix a memory leak in split-table dictionaries: setattr() must
28317 - bpo-28990: Fix asyncio SSL hanging if connection is closed before
28318   handshake is completed. (Patch by HoHo-Ho)
28321 -----------
28323 - bpo-28770: Fix python-gdb.py for fastcalls.
28326 -------
28328 - bpo-28896: Deprecate WindowsRegistryFinder.
28331 -----
28333 - bpo-28898: Prevent gdb build errors due to HAVE_LONG_LONG redefinition.
28339 *Release date: 2016-12-06*
28342 -----------------
28344 - bpo-23722: Rather than silently producing a class that doesn't support
28345   zero-argument ``super()`` in methods, failing to pass the new
28347   ``DeprecationWarning`` and a class that supports zero-argument
28350 - bpo-28797: Modifying the class __dict__ inside the __set_name__ method of
28351   a descriptor that is used inside that class no longer prevents calling the
28354 - bpo-28782: Fix a bug in the implementation ``yield from`` when checking if
28355   the next instruction is YIELD_FROM. Regression introduced by WORDCODE
28359 -------
28361 - bpo-27030: Unknown escapes in re.sub() replacement template are allowed
28364 - bpo-28835: Fix a regression introduced in warnings.catch_warnings(): call
28367 - bpo-27172: To assist with upgrades from 2.7, the previously documented
28369   decision may be revisited again after the Python 2.7 branch is no longer
28372 - bpo-26273: Add new :data:`socket.TCP_CONGESTION` (Linux 2.6.13) and
28376 - bpo-24142: Reading a corrupt config file left configparser in an invalid
28379 - bpo-28843: Fix asyncio C Task to handle exceptions __traceback__.
28382 -----
28384 - bpo-28808: PyUnicode_CompareWithASCIIString() now never raises exceptions.
28387 -------------
28389 - bpo-23722: The data model reference and the porting section in the What's
28391   custom metaclasses to fully support :pep:`487` and zero-argument
28395 -----------
28397 - bpo-28023: Fix python-gdb.py didn't support new dict implementation.
28403 *Release date: 2016-11-21*
28406 -----------------
28408 - bpo-28532: Show sys.version when -V option is supplied twice.
28410 - bpo-27100: The with-statement now checks for __enter__ before it checks
28414 - bpo-28746: Fix the set_inheritable() file descriptor method on platforms
28417 - bpo-26920: Fix not getting the locale's charset upon initializing the
28420 - bpo-28648: Fixed crash in Py_DecodeLocale() in debug build on Mac OS X
28423 - bpo-19398: Extra slash no longer added to sys.path components in case of
28424   empty compile-time PYTHONPATH components.
28426 - bpo-28665: Improve speed of the STORE_DEREF opcode by 40%.
28428 - bpo-28583: PyDict_SetDefault didn't combine split table when needed. Patch
28431 - bpo-27243: Change PendingDeprecationWarning -> DeprecationWarning. As it
28435 - bpo-26182: Fix a refleak in code that raises DeprecationWarning.
28437 - bpo-28721: Fix asynchronous generators aclose() and athrow() to handle
28441 -------
28443 - bpo-28752: Restored the __reduce__() methods of datetime objects.
28445 - bpo-28727: Regular expression patterns, _sre.SRE_Pattern objects created
28448   the warnings module is reloaded (thing usually only done in unit tests).
28450 - bpo-20572: The subprocess.Popen.wait method's undocumented endtime
28453 - bpo-25659: In ctypes, prevent a crash calling the from_buffer() and
28456 - bpo-19717: Makes Path.resolve() succeed on paths that do not exist. Patch
28459 - bpo-28563: Fixed possible DoS and arbitrary code execution when handle
28463 - bpo-28387: Fixed possible crash in _io.TextIOWrapper deallocator when the
28464   garbage collector is invoked in other thread.  Based on patch by Sebastian
28467 - bpo-28600: Optimize loop.call_soon.
28469 - bpo-28613: Fix get_event_loop() return the current loop if called from
28472 - bpo-28634: Fix asyncio.isfuture() to support unittest.Mock.
28474 - bpo-26081: Fix refleak in _asyncio.Future.__iter__().throw.
28476 - bpo-28639: Fix inspect.isawaitable to always return bool Patch by Justin
28479 - bpo-28652: Make loop methods reject socket kinds they do not support.
28481 - bpo-28653: Fix a refleak in functools.lru_cache.
28483 - bpo-28703: Fix asyncio.iscoroutinefunction to handle Mock objects.
28485 - bpo-28704: Fix create_unix_server to support Path-like objects (PEP 519).
28487 - bpo-28720: Add collections.abc.AsyncGenerator.
28490 -------------
28492 - bpo-28513: Documented command-line interface of zipfile.
28495 -----
28497 - bpo-28666: Now test.support.rmtree is able to remove unwritable or
28500 - bpo-23839: Various caches now are cleared before running every test file.
28503 -----
28505 - bpo-10656: Fix out-of-tree building on AIX.  Patch by Tristan Carel and
28508 - bpo-26359: Rename --with-optimiations to --enable-optimizations.
28510 - bpo-28676: Prevent missing 'getentropy' declaration warning on macOS.
28517 *Release date: 2016-10-31*
28520 -----------------
28522 - bpo-28128: Deprecation warning for invalid str and byte escape sequences
28526 - bpo-28509: dict.update() no longer allocate unnecessary large memory.
28528 - bpo-28426: Fixed potential crash in PyUnicode_AsDecodedObject() in debug
28531 - bpo-28517: Fixed of-by-one error in the peephole optimizer that caused
28534 - bpo-28214: Improved exception reporting for problematic __set_name__
28537 - bpo-23782: Fixed possible memory leak in _PyTraceback_Add() and exception
28540 - bpo-28471: Fix "Python memory allocator called without holding the GIL"
28544 -------
28546 - bpo-27517: LZMA compressor and decompressor no longer raise exceptions if
28549 - bpo-28549: Fixed segfault in curses's addch() with ncurses6.
28551 - bpo-28449: tarfile.open() with mode "r" or "r:" now tries to open a tar
28555 - bpo-23262: The webbrowser module now supports Firefox 36+ and derived
28558 - bpo-27939: Fixed bugs in tkinter.ttk.LabeledScale and tkinter.Scale caused
28560   now works if float value is set to underlying Tk variable.
28562 - bpo-18844: The various ways of specifying weights for random.choices() now
28565 - bpo-28255: calendar.TextCalendar().prmonth() no longer prints a space at
28569 - bpo-20491: The textwrap.TextWrapper class now honors non-breaking spaces.
28572 - bpo-28353: os.fwalk() no longer fails on broken links.
28574 - bpo-28430: Fix iterator of C implemented asyncio.Future doesn't accept
28575   non-None value is passed to it.send(val).
28577 - bpo-27025: Generated names for Tkinter widgets now start by the "!" prefix
28580 - bpo-25464: Fixed HList.header_exists() in tkinter.tix module by addin a
28583 - bpo-28488: shutil.make_archive() no longer adds entry "./" to ZIP archive.
28585 - bpo-25953: re.sub() now raises an error for invalid numerical group
28586   reference in replacement template even if the pattern is not found in the
28590 - bpo-18219: Optimize csv.DictWriter for large number of columns. Patch by
28593 - bpo-28448: Fix C implemented asyncio.Future didn't work on Windows.
28595 - bpo-28480: Fix error building socket module when multithreading is
28598 - bpo-24452: Make webbrowser support Chrome on Mac OS X.
28600 - bpo-20766: Fix references leaked by pdb in the handling of SIGINT
28603 - bpo-28492: Fix how StopIteration exception is raised in _asyncio.Future.
28605 - bpo-28500: Fix asyncio to handle async gens GC from another thread.
28607 - bpo-26923: Fix asyncio.Gather to refuse being cancelled once all children
28610 - bpo-26796: Don't configure the number of workers for default threadpool
28613 - bpo-28544: Implement asyncio.Task in C.
28616 -------
28618 - bpo-28522: Fixes mishandled buffer reallocation in getpathp.c
28621 -----
28623 - bpo-28444: Fix missing extensions modules when cross compiling.
28625 - bpo-28208: Update Windows build and OS X installers to use SQLite 3.14.2.
28627 - bpo-28248: Update Windows build and OS X installers to use OpenSSL 1.0.2j.
28630 -----
28632 - bpo-26944: Fix test_posix for Android where 'id -G' is entirely wrong or
28635 - bpo-28409: regrtest: fix the parser of command line arguments.
28641 *Release date: 2016-10-10*
28644 -----------------
28646 - bpo-28183: Optimize and cleanup dict iteration.
28648 - bpo-26081: Added C implementation of asyncio.Future. Original patch by
28651 - bpo-28379: Added sanity checks and tests for PyUnicode_CopyCharacters().
28654 - bpo-28376: The type of long range iterator is now registered as Iterator.
28657 - bpo-28376: Creating instances of range_iterator by calling range_iterator
28658   type now is deprecated.  Patch by Oren Milman.
28660 - bpo-28376: The constructor of range_iterator now checks that step is not
28663 - bpo-26906: Resolving special methods of uninitialized type now causes
28666 - bpo-18287: PyType_Ready() now checks that tp_name is not NULL. Original
28669 - bpo-24098: Fixed possible crash when AST is changed in process of
28672 - bpo-28201: Dict reduces possibility of 2nd conflict in hash table when
28675 - bpo-28350: String constants with null character no longer interned.
28677 - bpo-26617: Fix crash when GC runs during weakref callbacks.
28679 - bpo-27942: String constants now interned recursively in tuples and
28682 - bpo-21578: Fixed misleading error message when ImportError called with
28685 - bpo-28203: Fix incorrect type in complex(1.0, {2:3}) error message. Patch
28688 - bpo-28086: Single var-positional argument of tuple subtype was passed
28689   unscathed to the C-defined function.  Now it is converted to exact tuple.
28691 - bpo-28214: Now __set_name__ is looked up on the class instead of the
28694 - bpo-27955: Fallback on reading /dev/urandom device when the getrandom()
28697 - bpo-28192: Don't import readline in isolated mode.
28699 - Upgrade internal unicode databases to Unicode version 9.0.0.
28701 - bpo-28131: Fix a regression in zipimport's compile_source().  zipimport
28704 - bpo-28126: Replace Py_MEMCPY with memcpy(). Visual Studio can properly
28707 - bpo-28120: Fix dict.pop() for splitted dictionary when trying to remove a
28708   "pending key" (Not yet inserted in split-table). Patch by Xiang Zhang.
28710 - bpo-26182: Raise DeprecationWarning when async and await keywords are used
28714 -------
28716 - bpo-27998: Fixed bytes path support in os.scandir() on Windows. Patch by
28719 - bpo-28317: The disassembler now decodes FORMAT_VALUE argument.
28721 - bpo-26293: Fixed writing ZIP files that starts not from the start of the
28725 - bpo-28380: unittest.mock Mock autospec functions now properly support
28728 - bpo-27181: remove statistics.geometric_mean and defer until 3.7.
28730 - bpo-28229: lzma module now supports pathlib.
28732 - bpo-28321: Fixed writing non-BMP characters with binary format in
28735 - bpo-28225: bz2 module now supports pathlib.  Initial patch by Ethan
28738 - bpo-28227: gzip now supports pathlib.  Patch by Ethan Furman.
28740 - bpo-27358: Optimized merging var-keyword arguments and improved error
28741   message when passing a non-mapping as a var-keyword argument.
28743 - bpo-28257: Improved error message when passing a non-iterable as a
28744   var-positional argument.  Added opcode BUILD_TUPLE_UNPACK_WITH_CALL.
28746 - bpo-28322: Fixed possible crashes when unpickle itertools objects from
28749 - bpo-28228: imghdr now supports pathlib.
28751 - bpo-28226: compileall now supports pathlib.
28753 - bpo-28314: Fix function declaration (C flags) for the getiterator() method
28756 - bpo-28148: Stop using localtime() and gmtime() in the time module.
28757   Introduced platform independent _PyTime_localtime API that is similar to
28760 - bpo-28253: Fixed calendar functions for extreme months: 0001-01 and
28761   9999-12. Methods itermonthdays() and itermonthdays2() are reimplemented so
28765 - bpo-28275: Fixed possible use after free in the decompress() methods of
28769 - bpo-27897: Fixed possible crash in sqlite3.Connection.create_collation()
28770   if pass invalid string-like object as a name.  Patch by Xiang Zhang.
28772 - bpo-18844: random.choices() now has k as a keyword-only argument to
28776 - bpo-18893: Fix invalid exception handling in Lib/ctypes/macholib/dyld.py.
28779 - bpo-27611: Fixed support of default root window in the tkinter.tix module.
28782 - bpo-27348: In the traceback module, restore the formatting of exception
28786 - bpo-25651: Allow falsy values to be used for msg parameter of subTest().
28788 - bpo-27778: Fix a memory leak in os.getrandom() when the getrandom() is
28791 - bpo-28200: Fix memory leak on Windows in the os module (fix
28794 - bpo-25400: RobotFileParser now correctly returns default values for
28797 - bpo-27932: Prevent memory leak in win32_ver().
28799 - Fix UnboundLocalError in socket._sendfile_use_sendfile.
28801 - bpo-28075: Check for ERROR_ACCESS_DENIED in Windows implementation of
28804 - bpo-22493: Warning message emitted by using inline flags in the middle of
28808 - bpo-25270: Prevent codecs.escape_encode() from raising SystemError when an
28809   empty bytestring is passed.
28811 - bpo-28181: Get antigravity over HTTPS. Patch by Kaartic Sivaraam.
28813 - bpo-25895: Enable WebSocket URL schemes in urllib.parse.urljoin. Patch by
28816 - bpo-28114: Fix a crash in parse_envlist() when env contains byte strings.
28819 - bpo-27599: Fixed buffer overrun in binascii.b2a_qp() and
28822 - bpo-27906: Fix socket accept exhaustion during high TCP traffic. Patch by
28825 - bpo-28174: Handle when SO_REUSEPORT isn't properly supported. Patch by
28828 - bpo-26654: Inspect functools.partial in asyncio.Handle.__repr__. Patch by
28831 - bpo-26909: Fix slow pipes IO in asyncio. Patch by INADA Naoki.
28833 - bpo-28176: Fix callbacks race in asyncio.SelectorLoop.sock_connect.
28835 - bpo-27759: Fix selectors incorrectly retain invalid file descriptors.
28838 - bpo-28368: Refuse monitoring processes if the child watcher has no loop
28841 - bpo-28369: Raise RuntimeError when transport's FD is used with add_reader,
28844 - bpo-28370: Speedup asyncio.StreamReader.readexactly. Patch by Коренберг
28847 - bpo-28371: Deprecate passing asyncio.Handles to run_in_executor.
28849 - bpo-28372: Fix asyncio to support formatting of non-python coroutines.
28851 - bpo-28399: Remove UNIX socket from FS before binding. Patch by Коренберг
28854 - bpo-27972: Prohibit Tasks to await on themselves.
28857 -------
28859 - bpo-28402: Adds signed catalog files for stdlib on Windows.
28861 - bpo-28333: Enables Unicode for ps1/ps2 and input() prompts. (Patch by Eryk
28864 - bpo-28251: Improvements to help manuals on Windows.
28866 - bpo-28110: launcher.msi has different product codes between 32-bit and
28867   64-bit
28869 - bpo-28161: Opening CON for write access fails
28871 - bpo-28162: WindowsConsoleIO readall() fails if first line starts with
28874 - bpo-28163: WindowsConsoleIO fileno() passes wrong flags to _open_osfhandle
28876 - bpo-28164: _PyIO_get_console_type fails for various paths
28878 - bpo-28137: Renames Windows path file to ._pth
28880 - bpo-28138: Windows ._pth file should allow import site
28883 -----
28885 - bpo-28426: Deprecated undocumented functions PyUnicode_AsEncodedObject(),
28890 -----
28892 - bpo-28258: Fixed build with Estonian locale (python-config and distclean
28895 - bpo-26661: setup.py now detects system libffi with multiarch wrapper.
28897 - bpo-15819: Remove redundant include search directory option for building
28901 -----
28903 - bpo-28217: Adds _testconsole module to test console input.
28909 *Release date: 2016-09-12*
28912 -----------------
28914 - bpo-23722: The __class__ cell used by zero-argument super() is now
28919 - bpo-25221: Fix corrupted result from PyLong_FromLong(0) when Python is
28922 - bpo-27080: Implement formatting support for :pep:`515`.  Initial patch by
28925 - bpo-27199: In tarfile, expose copyfileobj bufsize to improve throughput.
28928 - bpo-27948: In f-strings, only allow backslashes inside the braces (where
28929   the expressions are).  This is a breaking change from the 3.6 alpha
28930   releases, where backslashes are allowed anywhere in an f-string.  Also,
28931   require that expressions inside f-strings be enclosed within literal
28934 - bpo-28046: Remove platform-specific directories from sys.path.
28936 - bpo-28071: Add early-out for differencing from an empty set.
28938 - bpo-25758: Prevents zipimport from unnecessarily encoding a filename
28941 - bpo-25856: The __module__ attribute of extension classes and functions now
28942   is interned. This leads to more compact pickle data with protocol 4.
28944 - bpo-27213: Rework CALL_FUNCTION* opcodes to produce shorter and more
28948 - bpo-26331: Implement tokenizing support for :pep:`515`. Patch by Georg
28951 - bpo-27999: Make "global after use" a SyntaxError, and ditto for nonlocal.
28954 - bpo-28003: Implement :pep:`525` -- Asynchronous Generators.
28956 - bpo-27985: Implement :pep:`526` -- Syntax for Variable Annotations. Patch
28959 - bpo-26058: Add a new private version to the builtin dict type, incremented
28963 - bpo-27364: A backslash-character pair that is not a valid escape sequence
28966 - bpo-27350: `dict` implementation is changed like PyPy. It is more compact
28970 - bpo-27911: Remove unnecessary error checks in
28973 - bpo-27078: Added BUILD_STRING opcode.  Optimized f-strings evaluation.
28975 - bpo-17884: Python now requires systems with inttypes.h and stdint.h
28977 - bpo-27961: Require platforms to support ``long long``. Python hasn't
28978   compiled without ``long long`` for years, so this is basically a
28981 - bpo-27355: Removed support for Windows CE.  It was never finished, and
28982   Windows CE is no longer a relevant platform for Python.
28984 - Implement :pep:`523`.
28986 - bpo-27870: A left shift of zero by a large integer no longer attempts to
28989 - bpo-25402: In int-to-decimal-string conversion, improve the estimate of
28993 - bpo-27214: In long_invert, be more careful about modifying object returned
28997 - bpo-27506: Support passing the bytes/bytearray.translate() "delete"
29000 - bpo-27812: Properly clear out a generator's frame's backreference to the
29003 - bpo-27811: Fix a crash when a coroutine that has not been awaited is
29004   finalized with warnings-as-errors enabled.
29006 - bpo-27587: Fix another issue found by PVS-Studio: Null pointer check after
29009 - bpo-27792: The modulo operation applied to ``bool`` and other ``int``
29013 - bpo-26984: int() now always returns an instance of exact int.
29015 - bpo-25604: Fix a minor bug in integer true division; this bug could
29016   potentially have caused off-by-one-ulp results on platforms with
29019 - bpo-24254: Make class definition namespace ordered by default.
29021 - bpo-27662: Fix an overflow check in ``List_New``: the original code was
29025 - bpo-27782: Multi-phase extension module import now correctly allows the
29027   of non-module types returned from ``Py_create_mod``. Patch by Xiang Zhang.
29029 - bpo-27936: The round() function accepted a second None argument for some
29033 - bpo-27487: Warn if a submodule argument to "python -m" or
29034   runpy.run_module() is found in sys.modules after parent packages are
29035   imported, but before the submodule is executed.
29037 - bpo-27157: Make only type() itself accept the one-argument form. Patch by
29040 - bpo-27558: Fix a SystemError in the implementation of "raise" statement.
29041   In a brand new thread, raise a RuntimeError since there is no active
29044 - bpo-28008: Implement :pep:`530` -- asynchronous comprehensions.
29046 - bpo-27942: Fix memory leak in codeobject.c
29049 -------
29051 - bpo-28732: Fix crash in os.spawnv() with no elements in args
29053 - bpo-28485: Always raise ValueError for negative
29054   compileall.compile_dir(workers=...) parameter, even when multithreading is
29057 - bpo-28037: Use sqlite3_get_autocommit() instead of setting
29058   Connection->inTransaction manually.
29060 - bpo-25283: Attributes tm_gmtoff and tm_zone are now available on all
29063 - bpo-24454: Regular expression match object groups are now accessible using
29064   __getitem__. "mo[x]" is equivalent to "mo.group(x)".
29066 - bpo-10740: sqlite3 no longer implicitly commit an open transaction before
29069 - bpo-17941: Add a *module* parameter to collections.namedtuple().
29071 - bpo-22493: Inline flags now should be used only at the start of the
29072   regular expression. Deprecation warning is emitted if uses them in the
29075 - bpo-26885: xmlrpc now supports unmarshalling additional data types used by
29076   Apache XML-RPC implementation for numerics and None.
29078 - bpo-28070: Fixed parsing inline verbose flag in regular expressions.
29080 - bpo-19500: Add client-side SSL session resumption to the ssl module.
29082 - bpo-28022: Deprecate ssl-related arguments in favor of SSLContext. The
29086 - bpo-28043: SSLContext has improved default settings: OP_NO_SSLv2,
29090 - bpo-24693: Changed some RuntimeError's in the zipfile module to more
29093 - bpo-17909: ``json.load`` and ``json.loads`` now support binary input
29094   encoded as UTF-8, UTF-16 or UTF-32. Patch by Serhiy Storchaka.
29096 - bpo-27137: the pure Python fallback implementation of
29101 - Fix possible integer overflows and crashes in the mmap module with unusual
29104 - bpo-1703178: Fix the ability to pass the --link-objects option to the
29107 - bpo-28019: itertools.count() no longer rounds non-integer step in range
29110 - bpo-18401: Pdb now supports the 'readrc' keyword argument to control
29114 - bpo-25969: Update the lib2to3 grammar to handle the unpacking
29117 - bpo-14977: mailcap now respects the order of the lines in the mailcap
29120 - bpo-28082: Convert re flag constants to IntFlag.
29122 - bpo-28025: Convert all ssl module constants to IntEnum and IntFlags.
29125 - bpo-23591: Add Flag, IntFlag, and auto() to enum module.
29127 - bpo-433028: Added support of modifier spans in regular expressions.
29129 - bpo-24594: Validates persist parameter when opening MSI database
29131 - bpo-17582: xml.etree.ElementTree nows preserves whitespaces in attributes
29134 - bpo-28047: Fixed calculation of line length used for the base64 CTE in the
29137 - bpo-27576: Fix call order in OrderedDict.__init__().
29139 - email.generator.DecodedGenerator now supports the policy keyword.
29141 - bpo-28027: Remove undocumented modules from ``Lib/plat-*``: IN, CDROM,
29144 - bpo-27445: Don't pass str(_charset) to MIMEText.set_payload(). Patch by
29147 - bpo-24277: The new email API is no longer provisional, and the docs have
29150 - bpo-22450: urllib now includes an ``Accept: */*`` header among the default
29154 - lib2to3.pgen3.driver.load_grammar() now creates a stable cache file
29158 - bpo-28005: Allow ImportErrors in encoding implementation to propagate.
29160 - bpo-26667: Support path-like objects in importlib.util.
29162 - bpo-27570: Avoid zero-length memcpy() etc calls with null source pointers
29165 - bpo-22233: Break email header lines *only* on the RFC specified CR and LF
29169 - bpo-27331: The email.mime classes now all accept an optional policy
29172 - bpo-27988: Fix email iter_attachments incorrect mutation of payload list.
29174 - bpo-16113: Add SHA-3 and SHAKE support to hashlib module.
29176 - Eliminate a tautological-pointer-compare warning in _scproxy.c.
29178 - bpo-27776: The :func:`os.urandom` function does now block on Linux 3.17
29179   and newer until the system urandom entropy pool is initialized to increase
29180   the security. This change is part of the :pep:`524`.
29182 - bpo-27778: Expose the Linux ``getrandom()`` syscall as a new
29183   :func:`os.getrandom` function. This change is part of the :pep:`524`.
29185 - bpo-27691: Fix ssl module's parsing of GEN_RID subject alternative name
29188 - bpo-18844: Add random.choices().
29190 - bpo-25761: Improved error reporting about truncated pickle data in C
29191   implementation of unpickler.  UnpicklingError is now raised instead of
29194 - bpo-26798: Add BLAKE2 (blake2b and blake2s) to hashlib.
29196 - bpo-26032: Optimized globbing in pathlib by using os.scandir(); it is now
29197   about 1.5--4 times faster.
29199 - bpo-25596: Optimized glob() and iglob() functions in the glob module; they
29200   are now about 3--6 times faster.
29202 - bpo-27928: Add scrypt (password-based key derivation function) to hashlib
29205 - bpo-27850: Remove 3DES from ssl module's default cipher list to counter
29206   measure sweet32 attack (CVE-2016-2183).
29208 - bpo-27766: Add ChaCha20 Poly1305 to ssl module's default cipher list.
29211 - bpo-25387: Check return value of winsound.MessageBeep.
29213 - bpo-27866: Add SSLContext.get_ciphers() method to get a list of all
29216 - bpo-27744: Add AF_ALG (Linux Kernel crypto) to socket module.
29218 - bpo-26470: Port ssl and hashlib module to OpenSSL 1.1.0.
29220 - bpo-11620: Fix support for SND_MEMORY in winsound.PlaySound.  Based on a
29223 - bpo-11734: Add support for IEEE 754 half-precision floats to the struct
29226 - bpo-27919: Deprecated ``extra_path`` distribution option in distutils
29229 - bpo-23229: Add new ``cmath`` constants: ``cmath.inf`` and ``cmath.nan`` to
29233 - bpo-27842: The csv.DictReader now returns rows of type OrderedDict.
29236 - Remove support for passing a file descriptor to os.access. It never worked
29239 - bpo-12885: Fix error when distutils encounters symlink.
29241 - bpo-27881: Fixed possible bugs when setting
29244 - bpo-27861: Fixed a crash in sqlite3.Connection.cursor() when a factory
29247 - bpo-19884: Avoid spurious output on OS X with Gnu Readline.
29249 - bpo-27706: Restore deterministic behavior of random.Random().seed() for
29254 - bpo-10513: Fix a regression in Connection.commit().  Statements should not
29257 - bpo-12319: Chunked transfer encoding support added to
29259   urllib.request.AbstractHTTPHandler class does not enforce a Content-Length
29261   Content-Length header, the library now falls back to use chunked
29262   transfer-encoding.
29264 - A new version of typing.py from https://github.com/python/typing: -
29265   Collection (only for 3.6) (Issue #27598) - Add FrozenSet to __all__
29266   (upstream #261) - fix crash in _get_type_vars() (upstream #259) - Remove
29269 - bpo-27832: Make ``_normalize`` parameter to ``Fraction`` constructor
29270   keyword-only, so that ``Fraction(2, 3, 4)`` now raises ``TypeError``.
29272 - bpo-27539: Fix unnormalised ``Fraction.__pow__`` result in the case of
29275 - bpo-21718: cursor.description is now available for queries using CTEs.
29277 - bpo-27819: In distutils sdists, simply produce the "gztar" (gzipped tar
29278   format) distributions on all platforms unless "formats" is supplied.
29280 - bpo-2466: posixpath.ismount now correctly recognizes mount points which
29283 - bpo-9998: On Linux, ctypes.util.find_library now looks in LD_LIBRARY_PATH
29286 - bpo-27573: exit message for code.interact is now configurable.
29288 - bpo-27930: Improved behaviour of logging.handlers.QueueListener. Thanks to
29291 - bpo-6766: Distributed reference counting added to multiprocessing to
29294 - bpo-21201: Improves readability of multiprocessing error message.  Thanks
29297 - asyncio: Add set_protocol / get_protocol to Transports.
29299 - bpo-27456: asyncio: Set TCP_NODELAY by default.
29302 ----
29304 - bpo-15308: Add 'interrupt execution' (^C) to Shell menu. Patch by Roger
29307 - bpo-27922: Stop IDLE tests from 'flashing' gui widgets on the screen.
29309 - bpo-27891: Consistently group and sort imports within idlelib modules.
29311 - bpo-17642: add larger font sizes for classroom projection.
29313 - Add version to title of IDLE help window.
29315 - bpo-25564: In section on IDLE -- console differences, mention that using
29316   exec means that __builtins__ is defined for each statement.
29318 - bpo-27821: Fix 3.6.0a3 regression that prevented custom key sets from
29322 -----
29324 - bpo-26900: Excluded underscored names and other private API from limited
29327 - bpo-26027: Add support for path-like objects in PyUnicode_FSConverter() &
29331 -----
29333 - bpo-27427: Additional tests for the math module. Patch by Francisco Couzo.
29335 - bpo-27953: Skip math and cmath tests that fail on OS X 10.4 due to a poor
29338 - bpo-26040: Improve test_math and test_cmath coverage and rigour. Patch by
29341 - bpo-27787: Call gc.collect() before checking each test for "dangling
29345 -----
29347 - bpo-27566: Fix clean target in freeze makefile (patch by Lisa Roach)
29349 - bpo-27705: Update message in validate_ucrtbase.py
29351 - bpo-27976: Deprecate building _ctypes with the bundled copy of libffi on
29352   non-OSX UNIX platforms.
29354 - bpo-27983: Cause lack of llvm-profdata tool when using clang as required
29356   ``--with-optimizations`` is enabled.  Also improve our ability to find the
29357   llvm-profdata tool on MacOS and some Linuxes.
29359 - bpo-21590: Support for DTrace and SystemTap probes.
29361 - bpo-26307: The profile-opt build now applies PGO to the built-in modules.
29363 - bpo-26359: Add the --with-optimizations flag to turn on LTO and PGO build
29366 - bpo-27917: Set platform triplets for Android builds.
29368 - bpo-25825: Update references to the $(LIBPL) installation path on AIX.
29371 - Update OS X installer to use SQLite 3.14.1 and XZ 5.2.2.
29373 - bpo-21122: Fix LTO builds on OS X.
29375 - bpo-17128: Build OS X installer with a private copy of OpenSSL. Also
29377   root certificates from the third-party certifi module.
29380 -----------
29382 - bpo-27952: Get Tools/scripts/fixcid.py working with Python 3 and the
29387 -------
29389 - bpo-28065: Update xz dependency to 5.2.2 and build it from source.
29391 - bpo-25144: Ensures TargetDir is set before continuing with custom install.
29393 - bpo-1602: Windows console doesn't input or print Unicode (PEP 528)
29395 - bpo-27781: Change file system encoding on Windows to UTF-8 (PEP 529)
29397 - bpo-27731: Opt-out of MAX_PATH on Windows 10
29399 - bpo-6135: Adds encoding and errors parameters to subprocess.
29401 - bpo-27959: Adds oem encoding, alias ansi to mbcs, move aliasmbcs to codec
29404 - bpo-27982: The functions of the winsound module now accept keyword
29407 - bpo-20366: Build full text search support into SQLite on Windows.
29409 - bpo-27756: Adds new icons for Python files and processes on Windows.
29412 - bpo-27883: Update sqlite to 3.14.1.0 on Windows.
29418 *Release date: 2016-08-15*
29421 -----------------
29423 - bpo-27704: Optimized creating bytes and bytearray from byte-like objects
29427 - bpo-26823: Large sections of repeated lines in tracebacks are now
29431 - bpo-27574: Decreased an overhead of parsing keyword arguments in functions
29434 - bpo-22557: Now importing already imported modules is up to 2.5 times
29437 - bpo-17596: Include <wincrypt.h> to help with Min GW building.
29439 - bpo-17599: On Windows, rename the privately defined REPARSE_DATA_BUFFER
29442 - bpo-27507: Add integer overflow check in bytearray.extend().  Patch by
29445 - bpo-27581: Don't rely on wrapping for overflow check in
29448 - bpo-1621: Avoid signed integer overflow in list and tuple operations.
29451 - bpo-27419: Standard __import__() no longer look up "__import__" in globals
29456 - bpo-27083: Respect the PYTHONCASEOK environment variable under Windows.
29458 - bpo-27514: Make having too many statically nested blocks a SyntaxError
29461 - bpo-27366: Implemented :pep:`487` (Simpler customization of class
29462   creation). Upon subclassing, the __init_subclass__ classmethod is called
29467 -------
29469 - bpo-26027: Add :pep:`519`/__fspath__() support to the os and os.path
29470   modules. Includes code from Jelle Zijlstra. (See also: bpo-27524)
29472 - bpo-27598: Add Collections to collections.abc. Patch by Ivan Levkivskyi,
29475 - bpo-25958: Support "anti-registration" of special methods from various
29478   if the method is not defined at all. (Previously, this mechanism existed
29482 - bpo-16764: Support keyword arguments to zlib.decompress().  Patch by Xiang
29485 - bpo-27736: Prevent segfault after interpreter re-initialization due to ref
29489 - bpo-25628: The *verbose* and *rename* parameters for
29490   collections.namedtuple are now keyword-only.
29492 - bpo-12345: Add mathematical constant tau to math and cmath. See also
29495 - bpo-26823: traceback.StackSummary.format now abbreviates large sections of
29500 - bpo-27664: Add to concurrent.futures.thread.ThreadPoolExecutor() the
29503 - bpo-27181: Add geometric_mean and harmonic_mean to statistics module.
29505 - bpo-27573: code.interact now prints an message when exiting.
29507 - bpo-6422: Add autorange method to timeit.Timer objects.
29509 - bpo-27773: Correct some memory management errors server_hostname in
29512 - bpo-26750: unittest.mock.create_autospec() now works properly for
29516 - bpo-26754: Undocumented support of general bytes-like objects as path in
29517   compile() and similar functions is now deprecated.
29519 - bpo-26800: Undocumented support of general bytes-like objects as paths in
29520   os functions is now deprecated.
29522 - bpo-26981: Add _order_ compatibility shim to enum.Enum for Python 2/3 code
29525 - bpo-27661: Added tzinfo keyword argument to datetime.combine.
29527 - In the curses module, raise an error if window.getstr() or window.instr()
29528   is passed a negative value.
29530 - bpo-27783: Fix possible usage of uninitialized memory in
29533 - bpo-27774: Fix possible Py_DECREF on unowned object in _sre.
29535 - bpo-27760: Fix possible integer overflow in binascii.b2a_qp.
29537 - bpo-27758: Fix possible integer overflow in the _csv module for large
29540 - bpo-27568: Prevent HTTPoxy attack (CVE-2016-1000110). Ignore the
29541   HTTP_PROXY variable when REQUEST_METHOD environment is set, which
29542   indicates that the script is in CGI mode.
29544 - bpo-7063: Remove dead code from the "array" module's slice handling. Patch
29547 - bpo-27656: Do not assume sched.h defines any SCHED_* constants.
29549 - bpo-27130: In the "zlib" module, fix handling of large buffers (typically
29554 - bpo-24773: Implemented :pep:`495` (Local Time Disambiguation).
29556 - Expose the EPOLLEXCLUSIVE constant (when it is defined) in the select
29559 - bpo-27567: Expose the EPOLLRDHUP and POLLRDHUP constants in the select
29562 - bpo-1621: Avoid signed int negation overflow in the "audioop" module.
29564 - bpo-27533: Release GIL in nt._isdir
29566 - bpo-17711: Fixed unpickling by the persistent ID with protocol 0. Original
29569 - bpo-27522: Avoid an unintentional reference cycle in email.feedparser.
29571 - bpo-27512: Fix a segfault when os.fspath() called an __fspath__() method
29575 ----
29577 - bpo-27714: text_textview and test_autocomplete now pass when re-run in the
29578   same process.  This occurs when test_idle fails when run with the -w
29579   option but without -jn.  Fix warning from test_config.
29581 - bpo-27621: Put query response validation error messages in the query box
29585 - bpo-27620: Escape key now closes Query box as cancelled.
29587 - bpo-27609: IDLE: tab after initial whitespace should tab, not
29591 - bpo-27609: Explicitly return None when there are also non-None returns. In
29594 - bpo-25507: IDLE no longer runs buggy code because of its tkinter imports.
29597 - bpo-27173: Add 'IDLE Modern Unix' to the built-in key sets. Make the
29601 - bpo-27452: add line counter and crc to IDLE configHandler test dump.
29604 -----
29606 - bpo-25805: Skip a test in test_pkgutil as needed that doesn't work when
29609 - bpo-27472: Add test.support.unix_shell as the path to the default shell.
29611 - bpo-27369: In test_pyexpat, avoid testing an error message detail that
29614 - bpo-27594: Prevent assertion error when running test_ast with coverage
29619 -------
29621 - bpo-27647: Update bundled Tcl/Tk to 8.6.6.
29623 - bpo-27610: Adds :pep:`514` metadata to Windows installer
29625 - bpo-27469: Adds a shell extension to the launcher so that drag and drop
29628 - bpo-27309: Enables proper Windows styles in python[w].exe manifest.
29631 -----
29633 - bpo-27713: Suppress spurious build warnings when updating importlib's
29636 - bpo-25825: Correct the references to Modules/python.exp, which is required
29639 - bpo-27453: CPP invocation in configure must use CPPFLAGS. Patch by Chi
29642 - bpo-27641: The configure script now inserts comments into the makefile to
29644   cross-compiled.
29646 - bpo-26662: Set PYTHON_FOR_GEN in configure as the Python program to be
29649 - bpo-10910: Avoid C++ compilation errors on FreeBSD and OS X. Also update
29650   FreedBSD version checks for the original ctype UTF-8 workaround.
29656 *Release date: 2016-07-11*
29659 --------
29661 - bpo-27278: Fix os.urandom() implementation using getrandom() on Linux.
29665 - bpo-22636: Avoid shell injection problems with ctypes.util.find_library().
29668 -----------------
29670 - bpo-27473: Fixed possible integer overflow in bytes and bytearray
29673 - bpo-23034: The output of a special Python build with defined COUNT_ALLOCS,
29674   SHOW_ALLOC_COUNT or SHOW_TRACK_COUNT macros is now off by  default.  It
29675   can be re-enabled using the "-X showalloccount" option.  It now outputs to
29678 - bpo-27443: __length_hint__() of bytearray iterators no longer return a
29681 - bpo-27007: The fromhex() class methods of bytes and bytearray subclasses
29685 -------
29687 - bpo-26844: Fix error message for imp.find_module() to refer to 'path'
29690 - bpo-23804: Fix SSL zero-length recv() calls to not block and not raise an
29693 - bpo-27466: Change time format returned by http.cookie.time2netscape,
29697 - bpo-21708: Deprecated dbm.dumb behavior that differs from common dbm
29701 - bpo-26721: Change the socketserver.StreamRequestHandler.wfile attribute to
29705 - bpo-22115: Added methods trace_add, trace_remove and trace_info in the
29713 - bpo-26243: Only the level argument to zlib.compress() is keyword argument
29714   now.  The first argument is positional-only.
29716 - bpo-27038: Expose the DirEntry type as os.DirEntry. Code patch by Jelle
29719 - bpo-27186: Update os.fspath()/PyOS_FSPath() to check the return value of
29722 - bpo-18726: All optional parameters of the dump(), dumps(), load() and
29724   the json module are now keyword-only.
29726 - bpo-27319: Methods selection_set(), selection_add(), selection_remove()
29731 - bpo-27079: Fixed curses.ascii functions isblank(), iscntrl() and
29734 - bpo-27294: Numerical state in the repr for Tkinter event objects is now
29737 - bpo-27177: Match objects in the re module now support index-like objects
29740 - bpo-26754: Some functions (compile() etc) accepted a filename argument
29741   encoded as an iterable of integers. Now only strings and byte-like objects
29744 - bpo-26536: socket.ioctl now supports SIO_LOOPBACK_FAST_PATH. Patch by
29747 - bpo-27048: Prevents distutils failing on Windows when environment
29748   variables contain non-ASCII characters
29750 - bpo-27330: Fixed possible leaks in the ctypes module.
29752 - bpo-27238: Got rid of bare excepts in the turtle module.  Original patch
29755 - bpo-27122: When an exception is raised within the context being managed by
29757   raises it in a chain, do not re-raise the original exception when exiting,
29761 - bpo-16864: sqlite3.Cursor.lastrowid now supports REPLACE statement.
29764 - bpo-26386: Fixed ttk.TreeView selection operations with item id's
29767 - bpo-8637: Honor a pager set by the env var MANPAGER (in preference to one
29770 - bpo-16182: Fix various functions in the "readline" module to use the
29774 - bpo-27392: Add loop.connect_accepted_socket(). Patch by Jim Fulton.
29777 ----
29779 - bpo-27477: IDLE search dialogs now use ttk widgets.
29781 - bpo-27173: Add 'IDLE Modern Unix' to the built-in key sets. Make the
29785 - bpo-27452: make command line "idle-test> python test_help.py" work.
29786   __file__ is relative when python is started in the file's directory.
29788 - bpo-27452: add line counter and crc to IDLE configHandler test dump.
29790 - bpo-27380: IDLE: add query.py with base Query dialog and ttk widgets.
29797 - bpo-27372: Test_idle no longer changes the locale.
29799 - bpo-27365: Allow non-ascii chars in IDLE NEWS.txt, for contributor names.
29801 - bpo-27245: IDLE: Cleanly delete custom themes and key bindings.
29805 - bpo-24137: Run IDLE, test_idle, and htest with tkinter default root
29807   to not create a second and redundant root and mainloop.
29809 - bpo-27310: Fix IDLE.app failure to launch on OS X due to vestigial import.
29812 -----
29814 - bpo-26754: PyUnicode_FSDecoder() accepted a filename argument encoded as
29815   an iterable of integers. Now only strings and byte-like objects are
29819 -----
29821 - bpo-28066: Fix the logic that searches build directories for generated
29824 - bpo-27442: Expose the Android API level that python was built against, in
29827 - bpo-27434: The interpreter that runs the cross-build, found in PATH, must
29830 - bpo-26930: Update Windows builds to use OpenSSL 1.0.2h.
29832 - bpo-23968: Rename the platform directory from plat-$(MACHDEP) to
29833   plat-$(PLATFORM_TRIPLET). Rename the config directory (LIBPL) from
29834   config-$(LDVERSION) to config-$(LDVERSION)-$(PLATFORM_TRIPLET). Install
29838 - Don't use largefile support for GNU/Hurd.
29841 -----------
29843 - bpo-27332: Fixed the type of the first argument of module-level functions
29846 - bpo-27418: Fixed Tools/importbench/importbench.py.
29849 -------------
29851 - bpo-19489: Moved the search box from the sidebar to the header and footer
29854 - bpo-27285: Update documentation to reflect the deprecation of ``pyvenv``
29858 -----
29860 - bpo-27027: Added test.support.is_android that is True when this is an
29867 *Release date: 2016-06-13*
29870 --------
29872 - bpo-26556: Update expat to 2.1.1, fixes CVE-2015-1283.
29874 - Fix TLS stripping vulnerability in smtplib, CVE-2016-0772. Reported by
29877 - bpo-26839: On Linux, :func:`os.urandom` now calls ``getrandom()`` with
29879   entropy pool is not initialized yet. Patch written by Colm Buckley.
29882 -----------------
29884 - bpo-27095: Simplified MAKE_FUNCTION and removed MAKE_CLOSURE opcodes.
29887 - bpo-27190: Raise NotSupportedError if sqlite3 is older than 3.3.1. Patch
29890 - bpo-27286: Fixed compiling BUILD_MAP_UNPACK_WITH_CALL opcode.  Calling
29894 - bpo-27140: Added BUILD_CONST_KEY_MAP opcode.
29896 - bpo-27186: Add support for os.PathLike objects to open() (part of
29899 - bpo-27066: Fixed SystemError if a custom opener (for open()) returns a
29902 - bpo-26983: float() now always return an instance of exact float. The
29903   deprecation warning is emitted if __float__ returns an instance of a
29907 - bpo-27097: Python interpreter is now about 7% faster due to optimized
29910 - bpo-26647: Python interpreter now uses 16-bit wordcode instead of
29913 - bpo-23275: Allow assigning to an empty target list in round brackets: () =
29916 - bpo-27243: Update the __aiter__ protocol: instead of returning an
29922 -------
29924 - Comment out socket (SO_REUSEPORT) and posix (O_SHLOCK, O_EXLOCK) constants
29928 - bpo-27025: Generated names for Tkinter widgets are now more meaningful and
29931 - bpo-25455: Fixed crashes in repr of recursive ElementTree.Element and
29934 - bpo-27294: Improved repr for Tkinter event objects.
29936 - bpo-20508: Improve exception message of IPv{4,6}Network.__getitem__. Patch
29939 - bpo-21386: Implement missing IPv4Address.is_global property.  It was
29942 - bpo-27029: Removed deprecated support of universal newlines mode from
29945 - bpo-27030: Unknown escapes consisting of ``'\'`` and an ASCII letter in
29949 - bpo-27186: Add os.PathLike support to DirEntry (part of :pep:`519`).
29952 - bpo-20900: distutils register command now decodes HTTP responses
29955 - bpo-27186: Add os.PathLike support to pathlib, removing its provisional
29958 - bpo-27186: Add support for os.PathLike objects to os.fsencode() and
29961 - bpo-27186: Introduce os.PathLike and os.fspath() (part of :pep:`519`).
29963 - A new version of typing.py provides several new classes and features:
29971 - bpo-25738: Stop http.server.BaseHTTPRequestHandler.send_error() from
29976 - bpo-21313: Fix the "platform" module to tolerate when sys.version contains
29979 - bpo-23883: Added missing APIs to __all__ to match the documented APIs for
29983 - bpo-27164: In the zlib module, allow decompressing raw Deflate streams
29986 - bpo-24291: Fix wsgiref.simple_server.WSGIRequestHandler to completely
29989   doing partial writes, but this is deprecated.
29991 - bpo-21272: Use _sysconfigdata.py to initialize distutils.sysconfig.
29993 - bpo-19611: :mod:`inspect` now reports the implicit ``.0`` parameters
29995   scopes as if they were positional-only parameters called ``implicit0``.
29998 - bpo-26809: Add ``__all__`` to :mod:`string`.  Patch by Emanuel Barry.
30000 - bpo-26373: subprocess.Popen.communicate now correctly ignores
30001   BrokenPipeError when the child process dies before .communicate() is
30004 - signal, socket, and ssl module IntEnum constant name lookups now return a
30009 - bpo-27167: Clarify the subprocess.CalledProcessError error message text
30012 - bpo-25931: Don't define socketserver.Forking* names on platforms such as
30015 - bpo-21776: distutils.upload now correctly handles HTTPError. Initial patch
30018 - bpo-26526: Replace custom parse tree validation in the parser module with
30021 - bpo-27114: Fix SSLContext._load_windows_store_certs fails with
30024 - bpo-18383: Avoid creating duplicate filters when using filterwarnings and
30027 - bpo-23026: winreg.QueryValueEx() now return an integer for REG_QWORD type.
30029 - bpo-26741: subprocess.Popen destructor now emits a ResourceWarning warning
30030   if the child process is still running.
30032 - bpo-27056: Optimize pickle.load() and pickle.loads(), up to 10% faster to
30035 - bpo-21271: New keyword only parameters in reset_mock call.
30038 ----
30040 - bpo-5124: Paste with text selected now replaces the selection on X11. This
30044 - bpo-24750: Switch all scrollbars in IDLE to ttk versions. Where needed,
30047 - bpo-24759: IDLE requires tk 8.5 and availability ttk widgets. Delete now
30051 - bpo-27239: idlelib.macosx.isXyzTk functions initialize as needed.
30053 - bpo-27262: move Aqua unbinding code, which enable context menus, to
30056 - bpo-24759: Make clear in idlelib.idle_test.__init__ that the directory is
30059 - bpo-27196: Stop 'ThemeChanged' warnings when running IDLE tests. These
30064 - bpo-20567: Revise idle_test/README.txt with advice about avoiding tk
30067 - bpo-24225: Update idlelib/README.txt with new file names and event
30070 - bpo-27156: Remove obsolete code not used by IDLE.
30072 - bpo-27117: Make colorizer htest and turtledemo work with dark themes. Move
30075 - bpo-24225: Rename many `idlelib/*.py` and `idle_test/test_*.py` files.
30080 - bpo-26673: When tk reports font size as 0, change to size 10. Such fonts
30083 - bpo-21939: Add test for IDLE's percolator. Original patch by Saimadhav
30086 - bpo-21676: Add test for IDLE's replace dialog. Original patch by Saimadhav
30089 - bpo-18410: Add test for IDLE's search dialog. Original patch by Westley
30092 - bpo-21703: Add test for undo delegator.  Patch mostly by Saimadhav
30095 - bpo-27044: Add ConfigDialog.remove_var_callbacks to stop memory leaks.
30097 - bpo-23977: Add more asserts to test_delegator.
30100 -------------
30102 - bpo-16484: Change the default PYTHONDOCS URL to "https:", and fix the
30106 - bpo-24136: Document the new :pep:`448` unpacking syntax of 3.5.
30108 - bpo-22558: Add remaining doc links to source code for Python-coded
30112 -----
30114 - bpo-25285: regrtest now uses subprocesses when the -j1 command line option
30115   is used: each test file runs in a fresh child process. Before, the -j1
30118 - bpo-25285: Tools/buildbot/test.bat script now uses -j1 by default to run
30122 -------
30124 - bpo-27064: The py.exe launcher now defaults to Python 3. The Windows
30128 - bpo-17500: Remove unused and outdated icons. (See also:
30132 -----
30134 - bpo-27229: Fix the cross-compiling pgen rule for in-tree builds.  Patch by
30137 - bpo-26930: Update OS X 10.5+ 32-bit-only installer to build and link with
30141 -----
30143 - bpo-27186: Add the PyOS_FSPath() function (part of :pep:`519`).
30145 - bpo-26282: PyArg_ParseTupleAndKeywords() now supports positional-only
30149 -----------
30151 - bpo-26282: Argument Clinic now supports positional-only and keyword
30158 *Release date: 2016-05-16*
30161 --------
30163 - bpo-26657: Fix directory traversal vulnerability with http.server on
30167 - bpo-26313: ssl.py _load_windows_store_certs fails if windows cert store is
30170 - bpo-25939: On Windows open the cert store readonly in
30174 -----------------
30176 - bpo-20041: Fixed TypeError when frame.f_trace is set to None. Patch by
30179 - bpo-26168: Fixed possible refleaks in failing Py_BuildValue() with the "N"
30182 - bpo-26991: Fix possible refleak when creating a function with annotations.
30184 - bpo-27039: Fixed bytearray.remove() for values greater than 127.  Based on
30187 - bpo-23640: int.from_bytes() no longer bypasses constructors for
30190 - bpo-27005: Optimized the float.fromhex() class method for exact float. It
30191   is now 2 times faster.
30193 - bpo-18531: Single var-keyword argument of dict subtype was passed
30194   unscathed to the C-defined function.  Now it is converted to exact dict.
30196 - bpo-26811: gc.get_objects() no longer contains a broken tuple with NULL
30199 - bpo-20120: Use RawConfigParser for .pypirc parsing, removing support for
30204 - bpo-26249: Memory functions of the :c:func:`PyMem_Malloc` domain
30211 - bpo-26802: Optimize function calls only using unpacking like
30215 - bpo-26659: Make the builtin slice type support cycle collection.
30217 - bpo-26718: super.__init__ no longer leaks memory if called multiple times.
30218   NOTE: A direct call of super.__init__ is not endorsed!
30220 - bpo-27138: Fix the doc comment for FileFinder.find_spec().
30222 - bpo-27147: Mention :pep:`420` in the importlib docs.
30224 - bpo-25339: PYTHONIOENCODING now has priority over locale in setting the
30227 - bpo-26494: Fixed crash on iterating exhausting iterators. Affected classes
30232 - bpo-26574: Optimize ``bytes.replace(b'', b'.')`` and
30235 - bpo-26581: If coding cookie is specified multiple times on a line in
30236   Python source code file, only the first one is taken to account.
30238 - bpo-19711: Add tests for reloading namespace packages.
30240 - bpo-21099: Switch applicable importlib tests to use :pep:`451` API.
30242 - bpo-26563: Debug hooks on Python memory allocators now raise a fatal error
30246 - bpo-26564: On error, the debug hooks on Python memory allocators now use
30250 - bpo-26558: The debug hooks on Python memory allocator
30254 - bpo-26516: Add :envvar:`PYTHONMALLOC` environment variable to set the
30257 - bpo-26516: The :c:func:`PyMem_SetupDebugHooks` function can now also be
30260 - bpo-26516: The :envvar:`PYTHONMALLOCSTATS` environment variable can now
30264 - bpo-26516: In debug mode, debug hooks are now also installed on Python
30265   memory allocators when Python is configured without pymalloc.
30267 - bpo-26464: Fix str.translate() when string is ASCII and first replacements
30268   removes character, but next replacement uses a non-ASCII character or a
30271 - bpo-22836: Ensure exception reports from PyErr_Display() and
30276 - bpo-26302: Correct behavior to reject comma as a legal character for
30279 - bpo-26136: Upgrade the warning when a generator raises StopIteration from
30282 - bpo-26204: The compiler now ignores all constant statements: bytes, str,
30284   ast.Constant; not only str and int. For example, ``1.0`` is now ignored in
30287 - bpo-4806: Avoid masking the original TypeError exception when using star
30291 - bpo-26146: Add a new kind of AST node: ``ast.Constant``. It can be used by
30295 - bpo-23601: Sped-up allocation of dict key objects by using Python's small
30298 - bpo-18018: Import raises ImportError instead of SystemError if a relative
30299   import is attempted without a known parent package.
30301 - bpo-25843: When compiling code, don't merge constants if they are equal
30303   1.0`` is now correctly compiled to two different functions: ``f1()``
30307 - bpo-26107: The format of the ``co_lnotab`` attribute of code objects
30310 - bpo-26154: Add a new private _PyThreadState_UncheckedGet() function to get
30311   the current Python thread state, but don't issue a fatal error if it is
30313   _PyThreadState_Current variable.  The variable is no more exposed since
30317 - bpo-25791: If __package__ != __spec__.parent or if neither __package__ or
30318   __spec__ are defined then ImportWarning is raised.
30320 - bpo-22995: [UPDATE] Comment out the one of the pickleability tests in
30321   _PyObject_GetState() due to regressions observed in Cython-based projects.
30323 - bpo-25961: Disallowed null characters in the type name.
30325 - bpo-25973: Fix segfault when an invalid nonlocal statement binds a name
30328 - bpo-22995: Instances of extension types with a state that aren't
30329   subclasses of list or dict and haven't implemented any pickle-related
30333 - bpo-20440: Massive replacing unsafe attribute setting code with special
30336 - bpo-25766: Special method __bytes__() now works in str subclasses.
30338 - bpo-25421: __sizeof__ methods of builtin types now use dynamic basic size.
30342 - bpo-25709: Fixed problem with in-place string concatenation and utf-8
30345 - bpo-5319: New Py_FinalizeEx() API allowing Python to set an exit status of
30348 - bpo-25485: telnetlib.Telnet is now a context manager.
30350 - bpo-24097: Fixed crash in object.__reduce__() if slot name is freed inside
30353 - bpo-24731: Fixed crash on converting objects with special methods
30358 - bpo-25630: Fix a possible segfault during argument parsing in functions
30361 - bpo-23564: Fixed a partially broken sanity check in the _posixsubprocess
30365 - bpo-25388: Fixed tokenizer crash when processing undecodable source code
30368 - bpo-25462: The hash of the key now is calculated only once in most
30371 - bpo-22995: Default implementation of __reduce__ and __reduce_ex__ now
30374 - bpo-24802: Avoid buffer overreads when int(), float(), compile(), exec()
30375   and eval() are passed bytes-like objects.  These objects are not
30379 - bpo-25555: Fix parser and AST: fill lineno and col_offset of "arg" node
30382 - bpo-24726: Fixed a crash and leaking NULL in repr() of OrderedDict that
30385 - bpo-25449: Iterating OrderedDict with keys with unstable hash now raises
30388 - bpo-25395: Fixed crash when highly nested OrderedDict structures were
30391 - bpo-25401: Optimize bytes.fromhex() and bytearray.fromhex(): they are now
30394 - bpo-25399: Optimize bytearray % args using the new private _PyBytesWriter
30395   API. Formatting is now between 2.5 and 5 times faster.
30397 - bpo-25274: sys.setrecursionlimit() now raises a RecursionError if the new
30398   recursion limit is too low depending at the current recursion depth.
30399   Modify also the "lower-water mark" formula to make it monotonic. This mark
30400   is used to decide when the overflowed flag of the thread state is reset.
30402 - bpo-24402: Fix input() to prompt to the redirected stdout when
30405 - bpo-25349: Optimize bytes % args using the new private _PyBytesWriter API.
30406   Formatting is now up to 2 times faster.
30408 - bpo-24806: Prevent builtin types that are not allowed to be subclassed
30411 - bpo-25301: The UTF-8 decoder is now up to 15 times as fast for error
30414 - bpo-24848: Fixed a number of bugs in UTF-7 decoding of misformed data.
30416 - bpo-25267: The UTF-8 encoder is now up to 75 times as fast for error
30418   Patch co-written with Serhiy Storchaka.
30420 - bpo-25280: Import trace messages emitted in verbose (-v) mode are no
30423 - bpo-25227: Optimize ASCII and latin1 encoders with the ``surrogateescape``
30427 - bpo-25003: On Solaris 11.3 or newer, os.urandom() now uses the getrandom()
30429   is blocking to generate very good quality entropy, os.urandom() doesn't
30430   need such high-quality entropy.
30432 - bpo-9232: Modify Python's grammar to allow trailing commas in the argument
30433   list of a function declaration.  For example, "def f(\*, a = 3,): pass" is
30436 - bpo-24965: Implement :pep:`498` "Literal String Interpolation". This
30437   allows you to embed expressions inside f-strings, which are converted to
30441 - bpo-26478: Fix semantic bugs when using binary operators with dictionary
30444 - bpo-26171: Fix possible integer overflow and heap corruption in
30447 - bpo-25660: Fix TAB key behaviour in REPL with readline.
30449 - bpo-26288: Optimize PyLong_AsDouble.
30451 - bpo-26289: Optimize floor and modulo division for single-digit longs.
30452   Microbenchmarks show 2-2.5x improvement.  Built-in 'divmod' function is
30453   now also ~10% faster. (See also: bpo-26315)
30455 - bpo-25887: Raise a RuntimeError when a coroutine object is awaited more
30459 -------
30461 - bpo-27057: Fix os.set_inheritable() on Android, ioctl() is blocked by
30465 - bpo-27014: Fix infinite recursion using typing.py.  Thanks to Kalle Tuure!
30467 - bpo-27031: Removed dummy methods in Tkinter widget classes: tk_menuBar()
30470 - bpo-14132: Fix urllib.request redirect handling when the target only has a
30473 - bpo-17214: The "urllib.request" module now percent-encodes non-ASCII bytes
30475   with non-ASCII bytes, but "http.client" requires the request target to be
30476   ASCII-encodable, otherwise a UnicodeEncodeError is raised.  Based on patch
30479 - bpo-27033: The default value of the decode_data parameter for
30480   smtpd.SMTPChannel and smtpd.SMTPServer constructors is changed to False.
30482 - bpo-27034: Removed deprecated class asynchat.fifo.
30484 - bpo-26870: Added readline.set_auto_history(), which can stop entries being
30488 - bpo-26039: zipfile.ZipFile.open() can now be used to write data into a ZIP
30491 - bpo-26892: Honor debuglevel flag in urllib.request.HTTPHandler. Patch
30494 - bpo-22274: In the subprocess module, allow stderr to be redirected to
30495   stdout even when stdout is not redirected.  Patch by Akira Li.
30497 - bpo-26807: mock_open 'files' no longer error on readline at end of file.
30500 - bpo-25745: Fixed leaking a userptr in curses panel destructor.
30502 - bpo-26977: Removed unnecessary, and ignored, call to sum of squares helper
30505 - bpo-26002: Use bisect in statistics.median instead of a linear search.
30508 - bpo-25974: Make use of new Decimal.as_integer_ratio() method in statistics
30511 - bpo-26996: Add secrets module as described in :pep:`506`.
30513 - bpo-26881: The modulefinder module now supports extended opcode arguments.
30515 - bpo-23815: Fixed crashes related to directly created instances of types in
30518 - bpo-17765: weakref.ref() no longer silently ignores keyword arguments.
30521 - bpo-26873: xmlrpc now raises ResponseError on unsupported type tags
30524 - bpo-26915: The __contains__ methods in the collections ABCs now check for
30529 - bpo-26711: Fixed the comparison of plistlib.Data with other types.
30531 - bpo-24114: Fix an uninitialized variable in `ctypes.util`. The bug only
30535 - bpo-26864: In urllib.request, change the proxy bypass host checking
30536   against no_proxy to be case-insensitive, and to not match unrelated host
30540 - bpo-24902: Print server URL on http.server startup.  Initial patch by
30543 - bpo-25788: fileinput.hook_encoded() now supports an "errors" argument for
30546 - bpo-26634: recursive_repr() now sets __qualname__ of wrapper.  Patch by
30549 - bpo-26804: urllib.request will prefer lower_case proxy environment
30551   Hans-Peter Jansen.
30553 - bpo-26837: assertSequenceEqual() now correctly outputs non-stringified
30554   differing items (like bytes in the -b mode).  This affects
30557 - bpo-26041: Remove "will be removed in Python 3.7" from deprecation
30561 - bpo-26822: itemgetter, attrgetter and methodcaller objects no longer
30564 - bpo-26733: Disassembling a class now disassembles class and static
30567 - bpo-26801: Fix error handling in :func:`shutil.get_terminal_size`, catch
30571 - bpo-24838: tarfile's ustar and gnu formats now correctly calculate name
30572   and link field limits for multibyte character encodings like utf-8.
30574 - bpo-26717: Stop encoding Latin-1-ized WSGI paths with UTF-8.  Patch by
30577 - bpo-26782: Add STARTUPINFO to subprocess.__all__ on Windows.
30579 - bpo-26404: Add context manager to socketserver.  Patch by Aviv Palivoda.
30581 - bpo-26735: Fix :func:`os.urandom` on Solaris 11.3 and newer when reading
30585 - bpo-26585: Eliminate http.server._quote_html() and use
30588 - bpo-26685: Raise OSError if closing a socket fails.
30590 - bpo-16329: Add .webm to mimetypes.types_map.  Patch by Giampaolo Rodola'.
30592 - bpo-13952: Add .csv to mimetypes.types_map.  Patch by Geoff Wilson.
30594 - bpo-26587: the site module now allows .pth files to specify files to be
30597 - bpo-25609: Introduce contextlib.AbstractContextManager and
30600 - bpo-26709: Fixed Y2038 problem in loading binary PLists.
30602 - bpo-23735: Handle terminal resizing with Readline 6.3+ by installing our
30605 - bpo-25951: Change SSLSocket.sendall() to return None, as explicitly
30608 - bpo-26586: In http.server, respond with "413 Request header fields too
30612 - bpo-26676: Added missing XMLPullParser to ElementTree.__all__.
30614 - bpo-22854: Change BufferedReader.writable() and BufferedWriter.readable()
30617 - bpo-26492: Exhausted iterator of array.array now conforms with the
30619   if iterated array is extended.
30621 - bpo-26641: doctest.DocFileTest and doctest.testfile() now support packages
30624 - bpo-25195: Fix a regression in mock.MagicMock. _Call is a subclass of
30628 - bpo-26644: Raise ValueError rather than SystemError when a negative length
30629   is passed to SSLSocket.recv() or read().
30631 - bpo-23804: Fix SSL recv(0) and read(0) methods to return zero bytes
30634 - bpo-26616: Fixed a bug in datetime.astimezone() method.
30636 - bpo-26637: The :mod:`importlib` module now emits an :exc:`ImportError`
30637   rather than a :exc:`TypeError` if :func:`__import__` is tried during the
30638   Python shutdown process but :data:`sys.path` is already cleared (set to
30641 - bpo-21925: :func:`warnings.formatwarning` now catches exceptions when
30646 - bpo-23848: On Windows, faulthandler.enable() now also installs an
30650 - bpo-26530: Add C functions :c:func:`_PyTraceMalloc_Track` and
30655 - bpo-26588: The _tracemalloc now supports tracing memory allocations of
30658 - bpo-24266: Ctrl+C during Readline history search now cancels the search
30661 - bpo-26590: Implement a safe finalizer for the _socket.socket type. It now
30664 - bpo-18787: spwd.getspnam() now raises a PermissionError if the user
30667 - bpo-26560: Avoid potential ValueError in BaseHandler.start_response.
30670 - bpo-26567: Add a new function :c:func:`PyErr_ResourceWarning` function to
30675 - bpo-26569: Fix :func:`pyclbr.readmodule` and :func:`pyclbr.readmodule_ex`
30678 - bpo-26499: Account for remaining Content-Length in HTTPResponse.readline()
30682 - bpo-25320: Handle sockets in directories unittest discovery is scanning.
30685 - bpo-16181: cookiejar.http2time() now returns None if year is higher than
30688 - bpo-26513: Fixes platform module detection of Windows Server
30690 - bpo-23718: Fixed parsing time in week 0 before Jan 1.  Original patch by
30693 - bpo-26323: Add Mock.assert_called() and Mock.assert_called_once() methods
30696 - bpo-20589: Invoking Path.owner() and Path.group() on Windows now raise
30699 - bpo-26177: Fixed the keys() method for Canvas and Scrollbar widgets.
30701 - bpo-15068: Got rid of excessive buffering in fileinput. The bufsize
30702   parameter is now deprecated and ignored.
30704 - bpo-19475: Added an optional argument timespec to the datetime isoformat()
30707 - bpo-2202: Fix UnboundLocalError in
30711 - bpo-26167: Minimized overhead in copy.copy() and copy.deepcopy().
30715 - bpo-25718: Fixed pickling and copying the accumulate() iterator with total
30716   is None.
30718 - bpo-26475: Fixed debugging output for regular expressions with the (?x)
30721 - bpo-26482: Allowed pickling recursive dequeues.
30723 - bpo-26335: Make mmap.write() return the number of bytes written like other
30726 - bpo-26457: Fixed the subnets() methods in IP network classes for the case
30727   when resulting prefix length is equal to maximal prefix length. Based on
30730 - bpo-26385: Remove the file if the internal open() call in
30733 - bpo-26402: Fix XML-RPC client to retry when the server shuts down a
30737 - bpo-25913: Leading ``<~`` is optional now in base64.a85decode() with
30740 - bpo-26186: Remove an invalid type check in importlib.util.LazyLoader.
30742 - bpo-26367: importlib.__import__() raises ImportError like
30743   builtins.__import__() when ``level`` is specified but without an
30746 - bpo-26309: In the "socketserver" module, shut down the request (closing
30750 - bpo-23430: Change the socketserver module to only catch exceptions raised
30753   trigger the handle_error() method, and will now to stop a single-threaded
30756 - bpo-25995: os.walk() no longer uses FDs proportional to the tree depth.
30758 - bpo-25994: Added the close() method and the support of the context manager
30761 - bpo-23992: multiprocessing: make MapResult not fail-fast upon exception.
30763 - bpo-26243: Support keyword arguments to zlib.compress().  Patch by Aviv
30766 - bpo-26117: The os.scandir() iterator now closes file descriptor not only
30767   when the iteration is finished, but when it was failed with error.
30769 - bpo-25949: __dict__ for an OrderedDict instance is now created only when
30772 - bpo-25911: Restored support of bytes paths in os.walk() on Windows.
30774 - bpo-26045: Add UTF-8 suggestion to error message when posting a
30775   non-Latin-1 string with http.client.
30777 - bpo-26039: Added zipfile.ZipInfo.from_file() and zipinfo.ZipInfo.is_dir().
30780 - bpo-12923: Reset FancyURLopener's redirect counter even if there is an
30783 - bpo-25945: Fixed a crash when unpickle the functools.partial object with
30788 - bpo-26202: copy.deepcopy() now correctly copies range() objects with
30789   non-atomic attributes.
30791 - bpo-23076: Path.glob() now raises a ValueError if it's called with an
30794 - bpo-19883: Fixed possible integer overflows in zipimport.
30796 - bpo-26227: On Windows, getnameinfo(), gethostbyaddr() and
30798   from the ANSI code page rather than UTF-8.
30800 - bpo-26099: The site module now writes an error into stderr if
30804 - bpo-26147: xmlrpc now works with strings not encodable with used non-UTF-8
30807 - bpo-25935: Garbage collector now breaks reference loops with OrderedDict.
30809 - bpo-16620: Fixed AttributeError in msilib.Directory.glob().
30811 - bpo-26013: Added compatibility with broken protocol 2 pickles created in
30814 - bpo-26129: Deprecated accepting non-integers in grp.getgrgid().
30816 - bpo-25850: Use cross-compilation by default for 64-bit Windows.
30818 - bpo-25822: Add docstrings to the fields of urllib.parse results. Patch
30821 - bpo-22642: Convert trace module option parsing mechanism to argparse.
30824 - bpo-24705: Fix sysconfig._parse_makefile not expanding ${} vars appearing
30827 - bpo-26069: Remove the deprecated apis in the trace module.
30829 - bpo-22138: Fix mock.patch behavior when patching descriptors. Restore
30832 - bpo-25672: In the ssl module, enable the SSL_MODE_RELEASE_BUFFERS mode
30833   option if it is safe to do so.
30835 - bpo-26012: Don't traverse into symlinks for ``**`` pattern in
30838 - bpo-24120: Ignore PermissionError when traversing a tree with
30841 - bpo-21815: Accept ] characters in the data portion of imap responses, in
30845 - bpo-25447: fileinput now uses sys.stdin as-is if it does not have a buffer
30848 - bpo-25971: Optimized creating Fractions from floats by 2 times and from
30851 - bpo-25802: Document as deprecated the remaining implementations of
30854 - bpo-25928: Add Decimal.as_integer_ratio().
30856 - bpo-25447: Copying the lru_cache() wrapper object now always works,
30860 - bpo-25768: Have the functions in compileall return booleans instead of
30863 - bpo-24103: Fixed possible use after free in ElementTree.XMLPullParser.
30865 - bpo-25860: os.fwalk() no longer skips remaining directories when error
30868 - bpo-25914: Fixed and simplified OrderedDict.__sizeof__.
30870 - bpo-25869: Optimized deepcopying ElementTree; it is now 20 times faster.
30872 - bpo-25873: Optimized iterating ElementTree.  Iterating elements
30873   Element.iter() is now 40% faster, iterating text Element.itertext() is now
30876 - bpo-25902: Fixed various refcount issues in ElementTree iteration.
30878 - bpo-22227: The TarFile iterator is reimplemented using generator. This
30879   implementation is simpler that using class.
30881 - bpo-25638: Optimized ElementTree.iterparse(); it is now 2x faster.
30882   Optimized ElementTree parsing; it is now 10% faster.
30884 - bpo-25761: Improved detecting errors in broken pickle data.
30886 - bpo-25717: Restore the previous behaviour of tolerating most fstat()
30890 - bpo-24903: Fix regression in number of arguments compileall accepts when
30891   '-d' is specified.  The check on the number of arguments has been dropped
30894 - bpo-25764: In the subprocess module, preserve any exception caused by
30895   fork() failure when preexec_fn is used.
30897 - bpo-25771: Tweak the exception message for importlib.util.resolve_name()
30900 - bpo-6478: _strptime's regexp cache now is reset after changing timezone
30903 - bpo-14285: When executing a package with the "python -m package" option,
30904   and package initialization fails, a proper traceback is now reported.  The
30908 - bpo-19771: Also in runpy and the "-m" option, omit the irrelevant message
30909   ". . . is a package and cannot be directly executed" if the package could
30912 - bpo-25177: Fixed problem with the mean of very small and very large
30916 - bpo-25718: Fixed copying object with state with boolean value is false.
30918 - bpo-10131: Fixed deep copying of minidom documents.  Based on patch by
30921 - bpo-7990: dir() on ElementTree.Element now lists properties: "tag",
30924 - bpo-25725: Fixed a reference leak in pickle.loads() when unpickling
30927 - bpo-25663: In the Readline completer, avoid listing duplicate global
30930 - bpo-25688: Fixed file leak in ElementTree.iterparse() raising an error.
30932 - bpo-23914: Fixed SystemError raised by unpickler on broken pickle data.
30934 - bpo-25691: Fixed crash on deleting ElementTree.Element attributes.
30936 - bpo-25624: ZipFile now always writes a ZIP_STORED header for directory
30939 - bpo-25626: Change three zlib functions to accept sizes that fit in
30946 - bpo-25583: Avoid incorrect errors raised by os.makedirs(exist_ok=True)
30949 - bpo-25593: Change semantics of EventLoop.stop() in asyncio.
30951 - bpo-6973: When we know a subprocess.Popen process has died, do not allow
30955 - bpo-23883: Added missing APIs to __all__ to match the documented APIs for
30961 - bpo-25590: In the Readline completer, only call getattr() once per
30965 - bpo-25498: Fix a crash when garbage-collecting ctypes objects created by
30969 - bpo-25584: Added "escape" to the __all__ list in the glob module.
30971 - bpo-25584: Fixed recursive glob() with patterns starting with ``**``.
30973 - bpo-25446: Fix regression in smtplib's AUTH LOGIN support.
30975 - bpo-18010: Fix the pydoc web server's module search function to handle
30978 - bpo-25554: Got rid of circular references in regular expression parsing.
30980 - bpo-18973: Command-line interface of the calendar module now uses argparse
30983 - bpo-25510: fileinput.FileInput.readline() now returns b'' instead of '' at
30987 - bpo-25503: Fixed inspect.getdoc() for inherited docstrings of properties.
30990 - bpo-25515: Always use os.urandom as a source of randomness in uuid.uuid4.
30992 - bpo-21827: Fixed textwrap.dedent() for the case when largest common
30993   whitespace is a substring of smallest leading whitespace. Based on patch
30996 - bpo-25447: The lru_cache() wrapper objects now can be copied and pickled
30999 - bpo-25390: typing: Don't crash on Union[str, Pattern].
31001 - bpo-25441: asyncio: Raise error from drain() when socket is closed.
31003 - bpo-25410: Cleaned up and fixed minor bugs in C implementation of
31006 - bpo-25411: Improved Unicode support in SMTPHandler through better use of
31009 - Move the imp module from a PendingDeprecationWarning to
31012 - bpo-25407: Remove mentions of the formatter module being removed in Python
31015 - bpo-25406: Fixed a bug in C implementation of OrderedDict.move_to_end()
31019 - bpo-25382: pickletools.dis() now outputs implicit memo index for the
31022 - bpo-25357: Add an optional newline parameter to binascii.b2a_base64().
31025 - bpo-24164: Objects that need calling ``__new__`` with keyword arguments,
31028 - bpo-25364: zipfile now works in threads disabled builds.
31030 - bpo-25328: smtpd's SMTPChannel now correctly raises a ValueError if both
31033 - bpo-16099: RobotFileParser now supports Crawl-delay and Request-rate
31036 - bpo-25316: distutils raises OSError instead of DistutilsPlatformError when
31037   MSVC is not installed.
31039 - bpo-25380: Fixed protocol for the STACK_GLOBAL opcode in
31042 - bpo-23972: Updates asyncio datagram create method allowing reuseport and
31045   datagram sockets defaults to True if the O/S is 'posix' (except if the
31046   platform is Cygwin). Patch by Chris Laws.
31048 - bpo-25304: Add asyncio.run_coroutine_threadsafe().  This lets you submit a
31052 - bpo-25232: Fix CGIRequestHandler to split the query from the URL at the
31055 - bpo-24657: Prevent CGIRequestHandler from collapsing slashes in the query
31058 - bpo-25287: Don't add crypt.METHOD_CRYPT to crypt.methods if it's not
31059   supported. Check if it is supported, it may not be supported on OpenBSD
31062 - bpo-23600: Default implementation of tzinfo.fromutc() was returning wrong
31065 - bpo-25203: Failed readline.set_completer_delims() no longer left the
31068 - bpo-25011: rlcompleter now omits private and special attribute names
31071 - bpo-25209: rlcompleter now can add a space or a colon after completed
31074 - bpo-22241: timezone.utc name is now plain 'UTC', not 'UTC-00:00'.
31076 - bpo-23517: fromtimestamp() and utcfromtimestamp() methods of
31079   rounding towards -Infinity (ROUND_FLOOR).
31081 - bpo-23552: Timeit now warns when there is substantial (4x) variance
31084 - bpo-24633: site-packages/README -> README.txt.
31086 - bpo-24879: help() and pydoc can now list named tuple fields in the order
31087   they were defined rather than alphabetically.  The ordering is determined
31090 - bpo-24874: Improve speed of itertools.cycle() and make its pickle more
31093 - Fix crash in itertools.cycle.__setstate__() when the first argument wasn't
31096 - bpo-20059: urllib.parse raises ValueError on all invalid ports. Patch by
31099 - bpo-24360: Improve __repr__ of argparse.Namespace() for invalid
31102 - bpo-23426: run_setup was broken in distutils. Patch from Alexander
31105 - bpo-13938: 2to3 converts StringTypes to a tuple. Patch from Mark Hammond.
31107 - bpo-2091: open() accepted a 'U' mode string containing '+', but 'U' can
31110 - bpo-8585: improved tests for zipimporter2. Patch from Mark Lawrence.
31112 - bpo-18622: unittest.mock.mock_open().reset_mock would recurse infinitely.
31115 - bpo-24426: Fast searching optimization in regular expressions now works
31119 - bpo-23661: unittest.mock side_effects can now be exceptions again. This
31122 - bpo-13248: Remove deprecated inspect.getmoduleinfo function.
31124 - bpo-25578: Fix (another) memory leak in SSLSocket.getpeercer().
31126 - bpo-25530: Disable the vulnerable SSLv3 protocol by default when creating
31129 - bpo-25569: Fix memory leak in SSLSocket.getpeercert().
31131 - bpo-25471: Sockets returned from accept() shouldn't appear to be
31134 - bpo-25319: When threading.Event is reinitialized, the underlying condition
31137 - Skip getaddrinfo if host is already resolved. Patch by A. Jesse Jiryu
31140 - bpo-26050: Add asyncio.StreamReader.readuntil() method. Patch by Марк
31143 - bpo-25924: Avoid unnecessary serialization of getaddrinfo(3) calls on OS X
31146 - bpo-26406: Avoid unnecessary serialization of getaddrinfo(3) calls on
31149 - bpo-26848: Fix asyncio/subprocess.communicate() to handle empty input.
31152 - bpo-27040: Add loop.get_exception_handler method
31154 - bpo-27041: asyncio: Add loop.create_future method
31157 ----
31159 - bpo-20640: Add tests for idlelib.configHelpSourceEdit. Patch by Saimadhav
31162 - In the 'IDLE-console differences' section of the IDLE doc, clarify how
31165 - bpo-25507: fix incorrect change in IOBinding that prevented printing.
31168 - bpo-25905: Revert unwanted conversion of ' to ’ RIGHT SINGLE QUOTATION
31169   MARK in README.txt and open this and NEWS.txt with 'ascii'. Re-encode
31170   CREDITS.txt to utf-8 and open it with 'utf-8'.
31172 - bpo-15348: Stop the debugger engine (normally in a user process) before
31176 - bpo-24455: Prevent IDLE from hanging when a) closing the shell while the
31177   debugger is active (15347); b) closing the debugger with the [X] button
31184 - Change 'The program' to 'Your program' in an IDLE 'kill program?' message
31185   to make it clearer that the program referred to is the currently running
31188 - bpo-24750: Improve the appearance of the IDLE editor window status bar.
31191 - bpo-25313: Change the handling of new built-in text color themes to better
31195 - bpo-24782: Extension configuration is now a tab in the IDLE Preferences
31199 - bpo-22726: Re-activate the config dialog help button with some content
31202 - bpo-24820: IDLE now has an 'IDLE Dark' built-in text color theme. It is
31209 - bpo-25224: README.txt is now an idlelib index for IDLE developers and
31210   curious users. The previous user content is now in the IDLE doc chapter.
31213 - bpo-24820: Users can now set breakpoint colors in Settings -> Custom
31216 - bpo-24972: Inactive selection background now matches active selection
31220 - bpo-24570: Idle: make calltip and completion boxes appear on Macs affected
31223 - bpo-24988: Idle ScrolledList context menus (used in debugger) now work on
31226 - bpo-24801: Make right-click for context menu work on Mac Aqua. Patch by
31229 - bpo-25173: Associate tkinter messageboxes with a specific widget. For Mac
31232 - bpo-25198: Enhance the initial html viewer now used for Idle Help.
31233   Properly indent fixed-pitch text (patch by Mark Roseman). Give code
31234   snippet a very Sphinx-like light blueish-gray background. Re-use initial
31236   Contents (TOC) menu is used, put the section header at the top of the
31239 - bpo-25225: Condense and rewrite Idle doc section on text colors.
31241 - bpo-21995: Explain some differences between IDLE and console Python.
31243 - bpo-22820: Explain need for *print* when running file from Idle editor.
31245 - bpo-25224: Doc: augment Idle feature list and no-subprocess section.
31247 - bpo-25219: Update doc for Idle command line options. Some were missing and
31250 - bpo-24861: Most of idlelib is private and subject to change. Use
31253 - bpo-25199: Idle: add synchronization comments for future maintainers.
31255 - bpo-16893: Replace help.txt with help.html for Idle doc display. The new
31256   idlelib/help.html is rstripped Doc/build/html/library/idle.html. It looks
31262 - bpo-24199: Deprecate unused idlelib.idlever with possible removal in 3.6.
31264 - bpo-24790: Remove extraneous code (which also create 2 & 3 conflicts).
31267 -------------
31269 - bpo-26736: Used HTTPS for external links in the documentation if possible.
31271 - bpo-6953: Rework the Readline module documentation to group related
31275 - bpo-23606: Adds note to ctypes documentation regarding cdll.msvcrt.
31277 - bpo-24952: Clarify the default size argument of stack_size() in the
31280 - bpo-26014: Update 3.x packaging documentation: * "See also" links to the
31285 -----
31287 - bpo-21916: Added tests for the turtle module.  Patch by ingrid, Gregory
31290 - bpo-26295: When using "python3 -m test --testdir=TESTDIR", regrtest
31293 - bpo-26523: The multiprocessing thread pool (multiprocessing.dummy.Pool)
31296 - bpo-26015: Added new tests for pickling iterators of mutable sequences.
31298 - bpo-26325: Added test.support.check_no_resource_warning() to check that no
31299   ResourceWarning is emitted.
31301 - bpo-25940: Changed test_ssl to use its internal local server more.  This
31304 - bpo-25616: Tests for OrderedDict are extracted from test_collections into
31307 - bpo-25449: Added tests for OrderedDict subclasses.
31309 - bpo-25188: Add -P/--pgo to test.regrtest to suppress error output when
31313 - bpo-22806: Add ``python -m test --list-tests`` command to list tests.
31315 - bpo-18174: ``python -m test --huntrleaks ...`` now also checks for leak of
31318 - bpo-25260: Fix ``python -m test --coverage`` on Windows. Remove the list
31321 - ``PCbuild\rt.bat`` now accepts an unlimited number of arguments to pass
31324 - bpo-26583: Skip test_timestamp_overflow in test_import if bytecode files
31328 -----
31330 - bpo-21277: Don't try to link _ctypes with a ffi_convenience library.
31332 - bpo-26884: Fix linking extension modules for cross builds. Patch by Xavier
31335 - bpo-26932: Fixed support of RTLD_* constants defined as enum values, not
31338 - bpo-22359: Disable the rules for running _freeze_importlib and pgen when
31339   cross-compiling.  The output of these programs is normally saved with the
31340   source code anyway, and is still regenerated when doing a native build.
31343 - bpo-21668: Link audioop, _datetime, _ctypes_test modules to libm, except
31346 - bpo-25702: A --with-lto configure option has been added that will enable
31347   link time optimizations at build time during a make profile-opt. Some
31350   provide a few % speed up over profile-opt alone.
31352 - bpo-26624: Adds validation of ucrtbase[d].dll version with warning for old
31355 - bpo-17603: Avoid error about nonexistent fileblocks.o file by using a
31356   lower-level check for st_blocks in struct stat.
31358 - bpo-26079: Fixing the build output folder for tix-8.4.3.6. Patch by Bjoern
31361 - bpo-26465: Update Windows builds to use OpenSSL 1.0.2g.
31363 - bpo-25348: Added ``--pgo`` and ``--pgo-job`` arguments to
31364   ``PCbuild\build.bat`` for building with Profile-Guided Optimization.  The
31365   old ``PCbuild\build_pgo.bat`` script is removed.
31367 - bpo-25827: Add support for building with ICC to ``configure``, including a
31368   new ``--with-icc`` flag.
31370 - bpo-25696: Fix installation of Python on UNIX with make -j9.
31372 - bpo-24986: It is now possible to build Python on Windows without errors
31375 - bpo-24421: Compile Modules/_math.c once, before building extensions.
31379 - bpo-26465: Update OS X 10.5+ 32-bit-only installer to build and link with
31382 - bpo-26268: Update Windows builds to use OpenSSL 1.0.2f.
31384 - bpo-25136: Support Apple Xcode 7's new textual SDK stub libraries.
31386 - bpo-24324: Do not enable unreachable code warnings when using gcc as the
31388   silently removed as of gcc-4.5.
31391 -------
31393 - bpo-27053: Updates make_zip.py to correctly generate library ZIP file.
31395 - bpo-26268: Update the prepare_ssl.py script to handle OpenSSL releases
31396   that don't include the contents of the include directory (that is, 1.0.2e
31399 - bpo-26071: bdist_wininst created binaries fail to start and find 32bit
31402 - bpo-26073: Update the list of magic numbers in launcher
31404 - bpo-26065: Excludes venv from library when generating embeddable distro.
31406 - bpo-25022: Removed very outdated PC/example_nt/ directory.
31409 -----------
31411 - bpo-26799: Fix python-gdb.py: don't get C types once when the Python code
31412   is loaded, but get C types on demand. The C types can change if
31413   python-gdb.py is loaded before the Python executable. Patch written by
31416 - bpo-26271: Fix the Freeze tool to properly use flags passed through
31419 - bpo-26489: Add dictionary unpacking support to Tools/parser/unparse.py.
31422 - bpo-26316: Fix variable name typo in Argument Clinic.
31424 - bpo-25440: Fix output of python-config --extension-suffix.
31426 - bpo-25154: The pyvenv script has been deprecated in favour of `python3 -m
31430 -----
31432 - bpo-26312: SystemError is now raised in all programming bugs with using
31436 - bpo-26198: ValueError is now raised instead of TypeError on buffer
31437   overflow in parsing "es#" and "et#" format units.  SystemError is now
31445 *Release date: 2018-02-04*
31454 *Release date: 2018-01-23*
31457 --------
31459 - bpo-32551: The ``sys.path[0]`` initialization change for bpo-29139 caused
31460   a regression by revealing an inconsistency in how sys.path is initialized
31462   location. This is considered a potential security issue, as it may lead to
31468   named on the command line. (Originally reported as bpo-29723 against
31472 - bpo-30657: Fixed possible integer overflow in PyBytes_DecodeEscape,
31473   CVE-2017-1000158. Original patch by Jay Bosamiya; rebased to Python 3 by
31476 - bpo-30947: Upgrade libexpat embedded copy from version 2.2.1 to 2.2.3 to
31480 -----------------
31482 - bpo-31095: Fix potential crash during GC caused by ``tp_dealloc`` which
31486 -------
31488 - bpo-32072: Fixed issues with binary plists: Fixed saving bytearrays.
31493 - bpo-31170: expat: Update libexpat from 2.2.3 to 2.2.4. Fix copying of
31494   partial characters for UTF-8 input (libexpat bug 115):
31501 *Release date: 2017-08-07*
31504 -------
31506 - bpo-30119: ftplib.FTP.putline() now throws ValueError on commands that
31507   contains CR or LF. Patch by Dong-hee Na.
31513 *Release date: 2017-07-23*
31516 --------
31518 - bpo-30730: Prevent environment variables injection in subprocess on
31522 - bpo-30694: Upgrade expat copy from 2.2.0 to 2.2.1 to get fixes of multiple
31523   security vulnerabilities including: CVE-2017-9233 (External entity
31524   infinite loop DoS), CVE-2016-9063 (Integer overflow, re-fix),
31525   CVE-2016-0718 (Fix regression bugs from 2.2.0's fix to CVE-2016-0718) and
31526   CVE-2012-0876 (Counter hash flooding with SipHash). Note: the
31527   CVE-2016-5300 (Use os-specific entropy sources like getrandom) doesn't
31531 - bpo-30500: Fix urllib.parse.splithost() to correctly parse fragments. For
31536 - bpo-29591: Update expat copy from 2.1.1 to 2.2.0 to get fixes of
31537   CVE-2016-0718 and CVE-2016-4472. See
31541 -----------------
31543 - bpo-30876: Relative import from unloaded package now reimports the package
31544   instead of failing with SystemError.  Relative import from non-package now
31547 - bpo-30765: Avoid blocking in pthread_mutex_lock() when
31548   PyThread_acquire_lock() is asked not to block.
31550 - bpo-27945: Fixed various segfaults with dict when input collections are
31554 - bpo-25794: Fixed type.__setattr__() and type.__delattr__() for
31555   non-interned attribute names.  Based on patch by Eryk Sun.
31557 - bpo-29935: Fixed error messages in the index() method of tuple, list and
31560 - bpo-28876: ``bool(range)`` works even if ``len(range)`` raises
31563 - bpo-29600: Fix wrapping coroutine return values in StopIteration.
31565 - bpo-29537: Restore runtime compatibility with bytecode files generated by
31571 - bpo-28598: Support __rmod__ for subclasses of str being called before
31574 - bpo-29602: Fix incorrect handling of signed zeros in complex constructor
31578 - bpo-29347: Fixed possibly dereferencing undefined pointers when creating
31581 - bpo-29438: Fixed use-after-free problem in key sharing dict.
31583 - bpo-29319: Prevent RunMainFromImporter overwriting sys.path[0].
31585 - bpo-29337: Fixed possible BytesWarning when compare the code objects.
31588 - bpo-29478: If max_line_length=None is specified while using the Compat32
31589   policy, it is no longer ignored.  Patch by Mircea Cosbuc.
31592 -------
31594 - bpo-29403: Fix ``unittest.mock``'s autospec to not fail on method-bound
31597 - bpo-30961: Fix decrementing a borrowed reference in tracemalloc.
31599 - bpo-30886: Fix multiprocessing.Queue.join_thread(): it now waits until the
31603 - bpo-29854: Fix segfault in readline when using readline's history-size
31606 - bpo-30807: signal.setitimer() may disable the timer when passed a tiny
31607   value. Tiny values (such as 1e-6) are valid non-zero values for
31608   setitimer(), which is specified as taking microsecond-resolution
31610   1e-6 into a zero interval, therefore disabling the timer instead of
31611   (re-)scheduling it.
31613 - bpo-30441: Fix bug when modifying os.environ while iterating over it
31615 - bpo-30532: Fix email header value parser dropping folding white space in
31618 - bpo-29169: Update zlib to 1.2.11.
31620 - bpo-30879: os.listdir() and os.scandir() now emit bytes names when called
31621   with bytes-like argument.
31623 - bpo-30746: Prohibited the '=' character in environment variable names in
31626 - bpo-29755: Fixed the lgettext() family of functions in the gettext module.
31629 - bpo-30645: Fix path calculation in imp.load_package(), fixing it for cases
31630   when a package is only shipped with bytecodes. Patch by Alexandru
31633 - bpo-23890: unittest.TestCase.assertRaises() now manually breaks a
31636 - bpo-30149: inspect.signature() now supports callables with
31637   variable-argument parameters wrapped with partialmethod. Patch by Dong-hee
31640 - bpo-29931: Fixed comparison check for ipaddress.ip_interface objects.
31643 - bpo-24484: Avoid race condition in multiprocessing cleanup.
31645 - bpo-28994: The traceback no longer displayed for SystemExit raised in a
31648 - bpo-30508: Don't log exceptions if Task/Future "cancel()" method was
31651 - bpo-28556: Updates to typing module: Add generic AsyncContextManager, add
31655 - bpo-29870: Fix ssl sockets leaks when connection is aborted in asyncio/ssl
31658 - bpo-29743: Closing transport during handshake process leaks open socket.
31661 - bpo-27585: Fix waiter cancellation in asyncio.Lock. Patch by Mathieu
31664 - bpo-30418: On Windows, subprocess.Popen.communicate() now also ignore
31665   EINVAL on stdin.write() if the child process is still running but closed
31668 - bpo-30378: Fix the problem that logging.handlers.SysLogHandler cannot
31671 - bpo-29960: Preserve generator state when _random.Random.setstate() raises
31674 - bpo-30414: multiprocessing.Queue._feed background running thread do not
31677 - bpo-30003: Fix handling escape characters in HZ codec.  Based on patch by
31680 - bpo-30301: Fix AttributeError when using SimpleQueue.empty() under *spawn*
31683 - bpo-30329: imaplib and poplib now catch the Windows socket WSAEINVAL error
31687 - bpo-30375: Warnings emitted when compile a regular expression now always
31691 - bpo-30048: Fixed ``Task.cancel()`` can be ignored when the task is running
31694 - bpo-29990: Fix range checking in GB18030 decoder.  Original patch by Ma
31697 - bpo-26293: Change resulted because of zipfile breakage. (See also:
31698   bpo-29094)
31700 - bpo-30243: Removed the __init__ methods of _json's scanner and encoder.
31704 - bpo-30185: Avoid KeyboardInterrupt tracebacks in forkserver helper process
31705   when Ctrl-C is received.
31707 - bpo-28556: Various updates to typing module: add typing.NoReturn type, use
31708   WrapperDescriptorType, minor bug-fixes.  Original PRs by Jim
31709   Fasarakis-Hilliard and Ivan Levkivskyi.
31711 - bpo-30205: Fix getsockname() for unbound AF_UNIX sockets on Linux.
31713 - bpo-30070: Fixed leaks and crashes in errors handling in the parser
31716 - bpo-30061: Fixed crashes in IOBase methods __next__() and readlines() when
31717   readline() or __next__() respectively return non-sizeable object. Fixed
31721 - bpo-30068: _io._IOBase.readlines will check if it's closed first when hint
31722   is present.
31724 - bpo-29694: Fixed race condition in pathlib mkdir with flags parents=True.
31727 - bpo-29692: Fixed arbitrary unchaining of RuntimeError exceptions in
31730 - bpo-29998: Pickling and copying ImportError now preserves name and path
31733 - bpo-29942: Fix a crash in itertools.chain.from_iterable when encountering
31736 - bpo-27863: Fixed multiple crashes in ElementTree caused by race conditions
31739 - bpo-28699: Fixed a bug in pools in multiprocessing.pool that raising an
31743 - bpo-25803: Avoid incorrect errors raised by Path.mkdir(exist_ok=True) when
31746 - bpo-29861: Release references to tasks, their arguments and their results
31749 - bpo-29884: faulthandler: Restore the old sigaltstack during teardown.
31752 - bpo-25455: Fixed crashes in repr of recursive buffered file-like objects.
31754 - bpo-29800: Fix crashes in partial.__repr__ if the keys of partial.keywords
31757 - bpo-29742: get_extra_info() raises exception if get called on closed ssl
31760 - bpo-8256: Fixed possible failing or crashing input() if attributes
31764 - bpo-28298: Fix a bug that prevented array 'Q', 'L' and 'I' from accepting
31768 - bpo-29615: SimpleXMLRPCDispatcher no longer chains KeyError (or any other
31772 - bpo-29704: asyncio.subprocess.SubprocessStreamProtocol no longer closes
31775 - bpo-29703: Fix asyncio to support instantiation of new event loops in
31778 - bpo-29376: Fix assertion error in threading._DummyThread.is_alive().
31780 - bpo-29110: Fix file object leak in aifc.open() when file is given as a
31781   filesystem path and is not in valid AIFF format. Patch by Anthony Zhang.
31783 - bpo-28961: Fix unittest.mock._Call helper: don't ignore the name parameter
31786 - bpo-29532: Altering a kwarg dictionary passed to functools.partial() no
31789 - bpo-28556: Various updates to typing module: typing.Counter,
31793 - bpo-29100: Fix datetime.fromtimestamp() regression introduced in Python
31796 - bpo-29519: Fix weakref spewing exceptions during interpreter shutdown when
31799 - bpo-29416: Prevent infinite loop in pathlib.Path.mkdir
31801 - bpo-29444: Fixed out-of-bounds buffer access in the group() method of the
31804 - bpo-29335: Fix subprocess.Popen.wait() when the child process has exited
31807 - bpo-29290: Fix a regression in argparse that help messages would wrap at
31808   non-breaking spaces.
31810 - bpo-28735: Fixed the comparison of mock.MagickMock with mock.ANY.
31812 - bpo-29011: Fix an important omission by adding Deque to the typing module.
31814 - bpo-29219: Fixed infinite recursion in the repr of uninitialized
31817 - bpo-28969: Fixed race condition in C implementation of
31822 - bpo-29142: In urllib.request, suffixes in no_proxy environment variable
31827 -------------
31829 - bpo-30176: Add missing attribute related constants in curses
31832 - bpo-26985: Add missing info of code object in inspect documentation.
31834 - bpo-28929: Link the documentation to its source file on GitHub.
31836 - bpo-25008: Document smtpd.py as effectively deprecated and add a pointer
31837   to aiosmtpd, a third-party asyncio-based replacement.
31839 - bpo-26355: Add canonical header link on each page to corresponding major
31842 - bpo-29349: Fix Python 2 syntax in code for building the documentation.
31845 -----
31847 - bpo-30822: Fix regrtest command line parser to allow passing -u
31850 - bpo-30383: regrtest: Enhance regrtest and backport features from the
31851   master branch. Add options: --coverage, --testdir, --list-tests (list test
31852   files, don't run them), --list-cases (list test identifiers, don't run
31853   them, :issue:`30523`), --matchfile (load a list of test filters from a
31854   text file, :issue:`30540`), --slowest (alias to --slow). Enhance output:
31857   --huntrleaks: regrtest now warms up caches, create explicitly all internal
31861 - bpo-30357: test_thread: setUp() now uses support.threading_setup() and
31866 - bpo-28087: Skip test_asyncore and test_eintr poll failures on macOS. Skip
31870 - bpo-30197: Enhanced functions swap_attr() and swap_item() in the
31874   clause, if there is one.
31876 - bpo-29571: to match the behaviour of the ``re.LOCALE`` flag,
31879   correctly skip the test when the default locale encoding is a multi-byte
31883 -----
31885 - bpo-29243: Prevent unnecessary rebuilding of Python during ``make test``,
31887   ``--enable-optimizations``.
31889 - bpo-23404: Don't regenerate generated files based on file modification
31890   time anymore: the action is now explicit. Replace ``make touch`` with
31891   ``make regen-all``.
31893 - bpo-29643: Fix ``--enable-optimization`` didn't work.
31896 -------
31898 - bpo-30687: Locate msbuild.exe on Windows when building rather than
31901 - bpo-29392: Prevent crash when passing invalid arguments into msvcrt
31905 -----
31907 - bpo-27867: Function PySlice_GetIndicesEx() is replaced with a macro if
31908   Py_LIMITED_API is set to the value between 0x03050400 and 0x03060000 (not
31911 - bpo-29083: Fixed the declaration of some public API functions.
31915   PY_SSIZE_T_CLEAN is defined.
31921 *Release date: 2017-01-17*
31930 *Release date: 2017-01-02*
31933 --------
31935 - bpo-27278: Fix os.urandom() implementation using getrandom() on Linux.
31939 - bpo-22636: Avoid shell injection problems with ctypes.util.find_library().
31942 -----------------
31944 - bpo-29073: bytearray formatting no longer truncates on first null byte.
31946 - bpo-28932: Do not include <sys/random.h> if it does not exist.
31948 - bpo-28147: Fix a memory leak in split-table dictionaries: setattr() must
31951 - bpo-25677: Correct the positioning of the syntax error caret for indented
31954 - bpo-29000: Fixed bytes formatting of octals with zero padding in alternate
31957 - bpo-28512: Fixed setting the offset attribute of SyntaxError by
31960 - bpo-28991: functools.lru_cache() was susceptible to an obscure reentrancy
31961   bug caused by a monkey-patched len() function.
31963 - bpo-28648: Fixed crash in Py_DecodeLocale() in debug build on Mac OS X
31966 - bpo-19398: Extra slash no longer added to sys.path components in case of
31967   empty compile-time PYTHONPATH components.
31969 - bpo-28426: Fixed potential crash in PyUnicode_AsDecodedObject() in debug
31972 - bpo-23782: Fixed possible memory leak in _PyTraceback_Add() and exception
31975 - bpo-28379: Added sanity checks and tests for PyUnicode_CopyCharacters().
31978 - bpo-28376: The type of long range iterator is now registered as Iterator.
31981 - bpo-28376: The constructor of range_iterator now checks that step is not
31984 - bpo-26906: Resolving special methods of uninitialized type now causes
31987 - bpo-18287: PyType_Ready() now checks that tp_name is not NULL. Original
31990 - bpo-24098: Fixed possible crash when AST is changed in process of
31993 - bpo-28350: String constants with null character no longer interned.
31995 - bpo-26617: Fix crash when GC runs during weakref callbacks.
31997 - bpo-27942: String constants now interned recursively in tuples and
32000 - bpo-21578: Fixed misleading error message when ImportError called with
32003 - bpo-28203: Fix incorrect type in error message from ``complex(1.0,
32006 - bpo-27955: Fallback on reading /dev/urandom device when the getrandom()
32009 - bpo-28131: Fix a regression in zipimport's compile_source().  zipimport
32012 - bpo-25221: Fix corrupted result from PyLong_FromLong(0) when Python is
32015 - bpo-25758: Prevents zipimport from unnecessarily encoding a filename
32018 - bpo-28189: dictitems_contains no longer swallows compare errors. (Patch by
32021 - bpo-27812: Properly clear out a generator's frame's backreference to the
32024 - bpo-27811: Fix a crash when a coroutine that has not been awaited is
32025   finalized with warnings-as-errors enabled.
32027 - bpo-27587: Fix another issue found by PVS-Studio: Null pointer check after
32030 - bpo-26020: set literal evaluation order did not match documented
32033 - bpo-27782: Multi-phase extension module import now correctly allows the
32035   of non-module types returned from ``Py_create_mod``. Patch by Xiang Zhang.
32037 - bpo-27936: The round() function accepted a second None argument for some
32041 - bpo-27487: Warn if a submodule argument to "python -m" or
32042   runpy.run_module() is found in sys.modules after parent packages are
32043   imported, but before the submodule is executed.
32045 - bpo-27558: Fix a SystemError in the implementation of "raise" statement.
32046   In a brand new thread, raise a RuntimeError since there is no active
32049 - bpo-27419: Standard __import__() no longer look up "__import__" in globals
32051   error of non-string package name.
32053 - bpo-27083: Respect the PYTHONCASEOK environment variable under Windows.
32055 - bpo-27514: Make having too many statically nested blocks a SyntaxError
32058 - bpo-27473: Fixed possible integer overflow in bytes and bytearray
32061 - bpo-27507: Add integer overflow check in bytearray.extend().  Patch by
32064 - bpo-27581: Don't rely on wrapping for overflow check in
32067 - bpo-27443: __length_hint__() of bytearray iterators no longer return a
32070 - bpo-27942: Fix memory leak in codeobject.c
32073 -------
32075 - bpo-15812: inspect.getframeinfo() now correctly shows the first line of a
32078 - bpo-29094: Offsets in a ZIP file created with extern file object and modes
32081 - bpo-13051: Fixed recursion errors in large or resized
32084 - bpo-29119: Fix weakrefs in the pure python version of
32088 - bpo-9770: curses.ascii predicates now work correctly with negative
32091 - bpo-28427: old keys should not remove new values from WeakValueDictionary
32094 - bpo-28923: Remove editor artifacts from Tix.py.
32096 - bpo-28871: Fixed a crash when deallocate deep ElementTree.
32098 - bpo-19542: Fix bugs in WeakValueDictionary.setdefault() and
32101 - bpo-20191: Fixed a crash in resource.prlimit() when pass a sequence that
32104 - bpo-28779: multiprocessing.set_forkserver_preload() would crash the
32108 - bpo-28847: dbm.dumb now supports reading read-only files and no longer
32109   writes the index file when it is not changed.
32111 - bpo-25659: In ctypes, prevent a crash calling the from_buffer() and
32114 - bpo-28732: Fix crash in os.spawnv() with no elements in args
32116 - bpo-28485: Always raise ValueError for negative
32117   compileall.compile_dir(workers=...) parameter, even when multithreading is
32120 - bpo-28387: Fixed possible crash in _io.TextIOWrapper deallocator when the
32121   garbage collector is invoked in other thread.  Based on patch by Sebastian
32124 - bpo-27517: LZMA compressor and decompressor no longer raise exceptions if
32127 - bpo-28549: Fixed segfault in curses's addch() with ncurses6.
32129 - bpo-28449: tarfile.open() with mode "r" or "r:" now tries to open a tar
32133 - bpo-23262: The webbrowser module now supports Firefox 36+ and derived
32136 - bpo-27939: Fixed bugs in tkinter.ttk.LabeledScale and tkinter.Scale caused
32138   now works if float value is set to underlying Tk variable.
32140 - bpo-28255: calendar.TextCalendar().prmonth() no longer prints a space at
32144 - bpo-20491: The textwrap.TextWrapper class now honors non-breaking spaces.
32147 - bpo-28353: os.fwalk() no longer fails on broken links.
32149 - bpo-25464: Fixed HList.header_exists() in tkinter.tix module by addin a
32152 - bpo-28488: shutil.make_archive() no longer add entry "./" to ZIP archive.
32154 - bpo-24452: Make webbrowser support Chrome on Mac OS X.
32156 - bpo-20766: Fix references leaked by pdb in the handling of SIGINT
32159 - bpo-26293: Fixed writing ZIP files that starts not from the start of the
32163 - bpo-28321: Fixed writing non-BMP characters with binary format in
32166 - bpo-28322: Fixed possible crashes when unpickle itertools objects from
32169 - Fix possible integer overflows and crashes in the mmap module with unusual
32172 - bpo-1703178: Fix the ability to pass the --link-objects option to the
32175 - bpo-28253: Fixed calendar functions for extreme months: 0001-01 and
32176   9999-12. Methods itermonthdays() and itermonthdays2() are reimplemented so
32180 - bpo-28275: Fixed possible use after free in the decompress() methods of
32184 - bpo-27897: Fixed possible crash in sqlite3.Connection.create_collation()
32185   if pass invalid string-like object as a name.  Patch by Xiang Zhang.
32187 - bpo-18893: Fix invalid exception handling in Lib/ctypes/macholib/dyld.py.
32190 - bpo-27611: Fixed support of default root window in the tkinter.tix module.
32192 - bpo-27348: In the traceback module, restore the formatting of exception
32196 - bpo-25651: Allow falsy values to be used for msg parameter of subTest().
32198 - bpo-27932: Prevent memory leak in win32_ver().
32200 - Fix UnboundLocalError in socket._sendfile_use_sendfile.
32202 - bpo-28075: Check for ERROR_ACCESS_DENIED in Windows implementation of
32205 - bpo-25270: Prevent codecs.escape_encode() from raising SystemError when an
32206   empty bytestring is passed.
32208 - bpo-28181: Get antigravity over HTTPS. Patch by Kaartic Sivaraam.
32210 - bpo-25895: Enable WebSocket URL schemes in urllib.parse.urljoin. Patch by
32213 - bpo-27599: Fixed buffer overrun in binascii.b2a_qp() and
32216 - bpo-19003: m email.generator now replaces only ``\r`` and/or ``\n`` line
32219 - bpo-28019: itertools.count() no longer rounds non-integer step in range
32222 - bpo-25969: Update the lib2to3 grammar to handle the unpacking
32225 - bpo-14977: mailcap now respects the order of the lines in the mailcap
32228 - bpo-24594: Validates persist parameter when opening MSI database
32230 - bpo-17582: xml.etree.ElementTree nows preserves whitespaces in attributes
32233 - bpo-28047: Fixed calculation of line length used for the base64 CTE in the
32236 - bpo-27445: Don't pass str(_charset) to MIMEText.set_payload(). Patch by
32239 - bpo-22450: urllib now includes an ``Accept: */*`` header among the default
32243 - lib2to3.pgen3.driver.load_grammar() now creates a stable cache file
32247 - bpo-27570: Avoid zero-length memcpy() etc calls with null source pointers
32250 - bpo-22233: Break email header lines *only* on the RFC specified CR and LF
32254 - bpo-27988: Fix email iter_attachments incorrect mutation of payload list.
32256 - bpo-27691: Fix ssl module's parsing of GEN_RID subject alternative name
32259 - bpo-27850: Remove 3DES from ssl module's default cipher list to counter
32260   measure sweet32 attack (CVE-2016-2183).
32262 - bpo-27766: Add ChaCha20 Poly1305 to ssl module's default cipher list.
32265 - bpo-26470: Port ssl and hashlib module to OpenSSL 1.1.0.
32267 - Remove support for passing a file descriptor to os.access. It never worked
32270 - bpo-12885: Fix error when distutils encounters symlink.
32272 - bpo-27881: Fixed possible bugs when setting
32275 - bpo-27861: Fixed a crash in sqlite3.Connection.cursor() when a factory
32278 - bpo-19884: Avoid spurious output on OS X with Gnu Readline.
32280 - bpo-27706: Restore deterministic behavior of random.Random().seed() for
32285 - bpo-10513: Fix a regression in Connection.commit().  Statements should not
32288 - A new version of typing.py from https://github.com/python/typing:
32293 - bpo-27539: Fix unnormalised ``Fraction.__pow__`` result in the case of
32296 - bpo-21718: cursor.description is now available for queries using CTEs.
32298 - bpo-2466: posixpath.ismount now correctly recognizes mount points which
32301 - bpo-27773: Correct some memory management errors server_hostname in
32304 - bpo-26750: unittest.mock.create_autospec() now works properly for
32307 - In the curses module, raise an error if window.getstr() or window.instr()
32308   is passed a negative value.
32310 - bpo-27783: Fix possible usage of uninitialized memory in
32313 - bpo-27774: Fix possible Py_DECREF on unowned object in _sre.
32315 - bpo-27760: Fix possible integer overflow in binascii.b2a_qp.
32317 - bpo-27758: Fix possible integer overflow in the _csv module for large
32320 - bpo-27568: Prevent HTTPoxy attack (CVE-2016-1000110). Ignore the
32321   HTTP_PROXY variable when REQUEST_METHOD environment is set, which
32322   indicates that the script is in CGI mode.
32324 - bpo-27656: Do not assume sched.h defines any SCHED_* constants.
32326 - bpo-27130: In the "zlib" module, fix handling of large buffers (typically
32331 - bpo-27533: Release GIL in nt._isdir
32333 - bpo-17711: Fixed unpickling by the persistent ID with protocol 0. Original
32336 - bpo-27522: Avoid an unintentional reference cycle in email.feedparser.
32338 - bpo-26844: Fix error message for imp.find_module() to refer to 'path'
32341 - bpo-23804: Fix SSL zero-length recv() calls to not block and not raise an
32344 - bpo-27466: Change time format returned by http.cookie.time2netscape,
32348 - bpo-26664: Fix activate.fish by removing mis-use of ``$``.
32350 - bpo-22115: Fixed tracing Tkinter variables: trace_vdelete() with wrong
32354 - Fix a scoping issue in importlib.util.LazyLoader which triggered an
32355   UnboundLocalError when lazy-loading a module that was already put into
32358 - bpo-27079: Fixed curses.ascii functions isblank(), iscntrl() and
32361 - bpo-26754: Some functions (compile() etc) accepted a filename argument
32362   encoded as an iterable of integers. Now only strings and byte-like objects
32365 - bpo-27048: Prevents distutils failing on Windows when environment
32366   variables contain non-ASCII characters
32368 - bpo-27330: Fixed possible leaks in the ctypes module.
32370 - bpo-27238: Got rid of bare excepts in the turtle module.  Original patch
32373 - bpo-27122: When an exception is raised within the context being managed by
32375   raises it in a chain, do not re-raise the original exception when exiting,
32379 - bpo-26386: Fixed ttk.TreeView selection operations with item id's
32382 - bpo-16182: Fix various functions in the "readline" module to use the
32386 - bpo-27392: Add loop.connect_accepted_socket(). Patch by Jim Fulton.
32388 - bpo-27930: Improved behaviour of logging.handlers.QueueListener. Thanks to
32391 - bpo-21201: Improves readability of multiprocessing error message.  Thanks
32394 - bpo-27456: asyncio: Set TCP_NODELAY by default.
32396 - bpo-27906: Fix socket accept exhaustion during high TCP traffic. Patch by
32399 - bpo-28174: Handle when SO_REUSEPORT isn't properly supported. Patch by
32402 - bpo-26654: Inspect functools.partial in asyncio.Handle.__repr__. Patch by
32405 - bpo-26909: Fix slow pipes IO in asyncio. Patch by INADA Naoki.
32407 - bpo-28176: Fix callbacks race in asyncio.SelectorLoop.sock_connect.
32409 - bpo-27759: Fix selectors incorrectly retain invalid file descriptors.
32412 - bpo-28368: Refuse monitoring processes if the child watcher has no loop
32415 - bpo-28369: Raise RuntimeError when transport's FD is used with add_reader,
32418 - bpo-28370: Speedup asyncio.StreamReader.readexactly. Patch by Коренберг
32421 - bpo-28371: Deprecate passing asyncio.Handles to run_in_executor.
32423 - bpo-28372: Fix asyncio to support formatting of non-python coroutines.
32425 - bpo-28399: Remove UNIX socket from FS before binding. Patch by Коренберг
32428 - bpo-27972: Prohibit Tasks to await on themselves.
32430 - bpo-26923: Fix asyncio.Gather to refuse being cancelled once all children
32433 - bpo-26796: Don't configure the number of workers for default threadpool
32436 - bpo-28600: Optimize loop.call_soon().
32438 - bpo-28613: Fix get_event_loop() return the current loop if called from
32441 - bpo-28639: Fix inspect.isawaitable to always return bool Patch by Justin
32444 - bpo-28652: Make loop methods reject socket kinds they do not support.
32446 - bpo-28653: Fix a refleak in functools.lru_cache.
32448 - bpo-28703: Fix asyncio.iscoroutinefunction to handle Mock objects.
32450 - bpo-24142: Reading a corrupt config file left the parser in an invalid
32453 - bpo-28990: Fix SSL hanging if connection is closed before handshake
32454   completed. (Patch by HoHo-Ho)
32457 ----
32459 - bpo-15308: Add 'interrupt execution' (^C) to Shell menu. Patch by Roger
32462 - bpo-27922: Stop IDLE tests from 'flashing' gui widgets on the screen.
32464 - Add version to title of IDLE help window.
32466 - bpo-25564: In section on IDLE -- console differences, mention that using
32467   exec means that __builtins__ is defined for each statement.
32469 - bpo-27714: text_textview and test_autocomplete now pass when re-run in the
32470   same process.  This occurs when test_idle fails when run with the -w
32471   option but without -jn.  Fix warning from test_config.
32473 - bpo-25507: IDLE no longer runs buggy code because of its tkinter imports.
32476 - bpo-27452: add line counter and crc to IDLE configHandler test dump.
32478 - bpo-27365: Allow non-ascii chars in IDLE NEWS.txt, for contributor names.
32480 - bpo-27245: IDLE: Cleanly delete custom themes and key bindings.
32485 -----
32487 - bpo-28808: PyUnicode_CompareWithASCIIString() now never raises exceptions.
32489 - bpo-26754: PyUnicode_FSDecoder() accepted a filename argument encoded as
32490   an iterable of integers. Now only strings and bytes-like objects are
32494 -------------
32496 - bpo-28513: Documented command-line interface of zipfile.
32499 -----
32501 - bpo-28950: Disallow -j0 to be combined with -T/-l/-M in regrtest command
32504 - bpo-28666: Now test.support.rmtree is able to remove unwritable or
32507 - bpo-23839: Various caches now are cleared before running every test file.
32509 - bpo-28409: regrtest: fix the parser of command line arguments.
32511 - bpo-27787: Call gc.collect() before checking each test for "dangling
32514 - bpo-27369: In test_pyexpat, avoid testing an error message detail that
32518 -----------
32520 - bpo-27952: Get Tools/scripts/fixcid.py working with Python 3 and the
32524 - bpo-27332: Fixed the type of the first argument of module-level functions
32527 - bpo-27418: Fixed Tools/importbench/importbench.py.
32530 -------
32532 - bpo-28251: Improvements to help manuals on Windows.
32534 - bpo-28110: launcher.msi has different product codes between 32-bit and
32535   64-bit
32537 - bpo-25144: Ensures TargetDir is set before continuing with custom install.
32539 - bpo-27469: Adds a shell extension to the launcher so that drag and drop
32542 - bpo-27309: Enabled proper Windows styles in python[w].exe manifest.
32545 -----
32547 - bpo-29080: Removes hard dependency on hg.exe from PCBuild/build.bat
32549 - bpo-23903: Added missed names to PC/python3.def.
32551 - bpo-10656: Fix out-of-tree building on AIX.  Patch by Tristan Carel and
32554 - bpo-26359: Rename --with-optimiations to --enable-optimizations.
32556 - bpo-28444: Fix missing extensions modules when cross compiling.
32558 - bpo-28248: Update Windows build and OS X installers to use OpenSSL 1.0.2j.
32560 - bpo-28258: Fixed build with Estonian locale (python-config and distclean
32563 - bpo-26661: setup.py now detects system libffi with multiarch wrapper.
32565 - bpo-28066: Fix the logic that searches build directories for generated
32568 - bpo-15819: Remove redundant include search directory option for building
32571 - bpo-27566: Fix clean target in freeze makefile (patch by Lisa Roach)
32573 - bpo-27705: Update message in validate_ucrtbase.py
32575 - bpo-27983: Cause lack of llvm-profdata tool when using clang as required
32577   --with-optimizations is enabled.  Also improve our ability to find the
32578   llvm-profdata tool on MacOS and some Linuxes.
32580 - bpo-26307: The profile-opt build now applies PGO to the built-in modules.
32582 - bpo-26359: Add the --with-optimizations configure flag.
32584 - bpo-27713: Suppress spurious build warnings when updating importlib's
32587 - bpo-25825: Correct the references to Modules/python.exp and ld_so_aix,
32592 - bpo-27453: CPP invocation in configure must use CPPFLAGS. Patch by Chi
32595 - bpo-27641: The configure script now inserts comments into the makefile to
32597   cross-compiled.
32599 - bpo-26662: Set PYTHON_FOR_GEN in configure as the Python program to be
32602 - bpo-10910: Avoid C++ compilation errors on FreeBSD and OS X. Also update
32603   FreedBSD version checks for the original ctype UTF-8 workaround.
32605 - bpo-28676: Prevent missing 'getentropy' declaration warning on macOS.
32612 *Release date: 2016-06-26*
32615 -----------------
32617 - bpo-26930: Update Windows builds to use OpenSSL 1.0.2h.
32620 -----
32622 - bpo-26867: Ubuntu's openssl OP_NO_SSLv3 is forced on by default; fix test.
32625 ----
32627 - bpo-27365: Allow non-ascii in idlelib/NEWS.txt - minimal part for 3.5.2.
32633 *Release date: 2016-06-12*
32636 --------
32638 - bpo-26556: Update expat to 2.1.1, fixes CVE-2015-1283.
32640 - Fix TLS stripping vulnerability in smtplib, CVE-2016-0772. Reported by
32643 - bpo-26839: On Linux, :func:`os.urandom` now calls ``getrandom()`` with
32645   entropy pool is not initialized yet. Patch written by Colm Buckley.
32647 - bpo-26657: Fix directory traversal vulnerability with http.server on
32651 - bpo-26313: ssl.py _load_windows_store_certs fails if windows cert store is
32654 - bpo-25939: On Windows open the cert store readonly in
32658 -----------------
32660 - bpo-27066: Fixed SystemError if a custom opener (for open()) returns a
32663 - bpo-20041: Fixed TypeError when frame.f_trace is set to None. Patch by
32666 - bpo-26168: Fixed possible refleaks in failing Py_BuildValue() with the "N"
32669 - bpo-26991: Fix possible refleak when creating a function with annotations.
32671 - bpo-27039: Fixed bytearray.remove() for values greater than 127.  Patch by
32674 - bpo-23640: int.from_bytes() no longer bypasses constructors for
32677 - bpo-26811: gc.get_objects() no longer contains a broken tuple with NULL
32680 - bpo-20120: Use RawConfigParser for .pypirc parsing, removing support for
32685 - bpo-26659: Make the builtin slice type support cycle collection.
32687 - bpo-26718: super.__init__ no longer leaks memory if called multiple times.
32688   NOTE: A direct call of super.__init__ is not endorsed!
32690 - bpo-25339: PYTHONIOENCODING now has priority over locale in setting the
32693 - bpo-26494: Fixed crash on iterating exhausting iterators. Affected classes
32698 - bpo-26581: If coding cookie is specified multiple times on a line in
32699   Python source code file, only the first one is taken to account.
32701 - bpo-26464: Fix str.translate() when string is ASCII and first replacements
32702   removes character, but next replacement uses a non-ASCII character or a
32705 - bpo-22836: Ensure exception reports from PyErr_Display() and
32710 - bpo-26302: Correct behavior to reject comma as a legal character for
32713 - bpo-4806: Avoid masking the original TypeError exception when using star
32717 - bpo-27138: Fix the doc comment for FileFinder.find_spec().
32719 - bpo-26154: Add a new private _PyThreadState_UncheckedGet() function to get
32720   the current Python thread state, but don't issue a fatal error if it is
32722   _PyThreadState_Current variable.  The variable is no more exposed since
32726 - bpo-26194: Deque.insert() gave odd results for bounded deques that had
32730 - bpo-25843: When compiling code, don't merge constants if they are equal
32732   1.0`` is now correctly compiled to two different functions: ``f1()``
32736 - bpo-22995: [UPDATE] Comment out the one of the pickleability tests in
32737   _PyObject_GetState() due to regressions observed in Cython-based projects.
32739 - bpo-25961: Disallowed null characters in the type name.
32741 - bpo-25973: Fix segfault when an invalid nonlocal statement binds a name
32744 - bpo-22995: Instances of extension types with a state that aren't
32745   subclasses of list or dict and haven't implemented any pickle-related
32749 - bpo-20440: Massive replacing unsafe attribute setting code with special
32752 - bpo-25766: Special method __bytes__() now works in str subclasses.
32754 - bpo-25421: __sizeof__ methods of builtin types now use dynamic basic size.
32758 - bpo-25709: Fixed problem with in-place string concatenation and utf-8
32761 - bpo-27147: Mention :pep:`420` in the importlib docs.
32763 - bpo-24097: Fixed crash in object.__reduce__() if slot name is freed inside
32766 - bpo-24731: Fixed crash on converting objects with special methods
32771 - bpo-26478: Fix semantic bugs when using binary operators with dictionary
32774 - bpo-26171: Fix possible integer overflow and heap corruption in
32777 - bpo-25660: Fix TAB key behaviour in REPL with readline.
32779 - bpo-25887: Raise a RuntimeError when a coroutine object is awaited more
32782 - bpo-27243: Update the __aiter__ protocol: instead of returning an
32788 -------
32790 - bpo-21386: Implement missing IPv4Address.is_global property.  It was
32793 - bpo-20900: distutils register command now decodes HTTP responses
32796 - A new version of typing.py provides several new classes and features:
32804 - bpo-25738: Stop http.server.BaseHTTPRequestHandler.send_error() from
32809 - bpo-21313: Fix the "platform" module to tolerate when sys.version contains
32812 - bpo-27164: In the zlib module, allow decompressing raw Deflate streams
32815 - bpo-24291: Fix wsgiref.simple_server.WSGIRequestHandler to completely
32818   doing partial writes, but this is deprecated.
32820 - bpo-26809: Add ``__all__`` to :mod:`string`.  Patch by Emanuel Barry.
32822 - bpo-26373: subprocess.Popen.communicate now correctly ignores
32823   BrokenPipeError when the child process dies before .communicate() is
32826 - bpo-21776: distutils.upload now correctly handles HTTPError. Initial patch
32829 - bpo-27114: Fix SSLContext._load_windows_store_certs fails with
32832 - bpo-18383: Avoid creating duplicate filters when using filterwarnings and
32835 - bpo-27057: Fix os.set_inheritable() on Android, ioctl() is blocked by
32839 - bpo-27014: Fix infinite recursion using typing.py.  Thanks to Kalle Tuure!
32841 - bpo-14132: Fix urllib.request redirect handling when the target only has a
32844 - bpo-17214: The "urllib.request" module now percent-encodes non-ASCII bytes
32846   with non-ASCII bytes, but "http.client" requires the request target to be
32847   ASCII-encodable, otherwise a UnicodeEncodeError is raised.  Based on patch
32850 - bpo-26892: Honor debuglevel flag in urllib.request.HTTPHandler. Patch
32853 - bpo-22274: In the subprocess module, allow stderr to be redirected to
32854   stdout even when stdout is not redirected.  Patch by Akira Li.
32856 - bpo-26807: mock_open 'files' no longer error on readline at end of file.
32859 - bpo-25745: Fixed leaking a userptr in curses panel destructor.
32861 - bpo-26977: Removed unnecessary, and ignored, call to sum of squares helper
32864 - bpo-26881: The modulefinder module now supports extended opcode arguments.
32866 - bpo-23815: Fixed crashes related to directly created instances of types in
32869 - bpo-17765: weakref.ref() no longer silently ignores keyword arguments.
32872 - bpo-26873: xmlrpc now raises ResponseError on unsupported type tags
32875 - bpo-26711: Fixed the comparison of plistlib.Data with other types.
32877 - bpo-24114: Fix an uninitialized variable in `ctypes.util`. The bug only
32881 - bpo-26864: In urllib.request, change the proxy bypass host checking
32882   against no_proxy to be case-insensitive, and to not match unrelated host
32886 - bpo-26634: recursive_repr() now sets __qualname__ of wrapper.  Patch by
32889 - bpo-26804: urllib.request will prefer lower_case proxy environment
32891   Hans-Peter Jansen.
32893 - bpo-26837: assertSequenceEqual() now correctly outputs non-stringified
32894   differing items (like bytes in the -b mode).  This affects
32897 - bpo-26041: Remove "will be removed in Python 3.7" from deprecation
32901 - bpo-26822: itemgetter, attrgetter and methodcaller objects no longer
32904 - bpo-26733: Disassembling a class now disassembles class and static
32907 - bpo-26801: Fix error handling in :func:`shutil.get_terminal_size`, catch
32911 - bpo-24838: tarfile's ustar and gnu formats now correctly calculate name
32912   and link field limits for multibyte character encodings like utf-8.
32914 - bpo-26717: Stop encoding Latin-1-ized WSGI paths with UTF-8.  Patch by
32917 - bpo-26735: Fix :func:`os.urandom` on Solaris 11.3 and newer when reading
32921 - bpo-16329: Add .webm to mimetypes.types_map.  Patch by Giampaolo Rodola'.
32923 - bpo-13952: Add .csv to mimetypes.types_map.  Patch by Geoff Wilson.
32925 - bpo-26709: Fixed Y2038 problem in loading binary PLists.
32927 - bpo-23735: Handle terminal resizing with Readline 6.3+ by installing our
32930 - bpo-26586: In http.server, respond with "413 Request header fields too
32934 - bpo-22854: Change BufferedReader.writable() and BufferedWriter.readable()
32937 - bpo-25195: Fix a regression in mock.MagicMock. _Call is a subclass of
32941 - bpo-26644: Raise ValueError rather than SystemError when a negative length
32942   is passed to SSLSocket.recv() or read().
32944 - bpo-23804: Fix SSL recv(0) and read(0) methods to return zero bytes
32947 - bpo-26616: Fixed a bug in datetime.astimezone() method.
32949 - bpo-21925: :func:`warnings.formatwarning` now catches exceptions on
32953 - bpo-24266: Ctrl+C during Readline history search now cancels the search
32956 - bpo-26560: Avoid potential ValueError in BaseHandler.start_response.
32959 - bpo-26569: Fix :func:`pyclbr.readmodule` and :func:`pyclbr.readmodule_ex`
32962 - bpo-26499: Account for remaining Content-Length in HTTPResponse.readline()
32966 - bpo-25320: Handle sockets in directories unittest discovery is scanning.
32969 - bpo-16181: cookiejar.http2time() now returns None if year is higher than
32972 - bpo-26513: Fixes platform module detection of Windows Server
32974 - bpo-23718: Fixed parsing time in week 0 before Jan 1.  Original patch by
32977 - bpo-20589: Invoking Path.owner() and Path.group() on Windows now raise
32980 - bpo-26177: Fixed the keys() method for Canvas and Scrollbar widgets.
32982 - bpo-15068: Got rid of excessive buffering in the fileinput module. The
32983   bufsize parameter is no longer used.
32985 - bpo-2202: Fix UnboundLocalError in
32989 - bpo-25718: Fixed pickling and copying the accumulate() iterator with total
32990   is None.
32992 - bpo-26475: Fixed debugging output for regular expressions with the (?x)
32995 - bpo-26457: Fixed the subnets() methods in IP network classes for the case
32996   when resulting prefix length is equal to maximal prefix length. Based on
32999 - bpo-26385: Remove the file if the internal open() call in
33002 - bpo-26402: Fix XML-RPC client to retry when the server shuts down a
33006 - bpo-25913: Leading ``<~`` is optional now in base64.a85decode() with
33009 - bpo-26186: Remove an invalid type check in importlib.util.LazyLoader.
33011 - bpo-26367: importlib.__import__() raises SystemError like
33012   builtins.__import__() when ``level`` is specified but without an
33015 - bpo-26309: In the "socketserver" module, shut down the request (closing
33019 - bpo-25995: os.walk() no longer uses FDs proportional to the tree depth.
33021 - bpo-26117: The os.scandir() iterator now closes file descriptor not only
33022   when the iteration is finished, but when it was failed with error.
33024 - bpo-25911: Restored support of bytes paths in os.walk() on Windows.
33026 - bpo-26045: Add UTF-8 suggestion to error message when posting a
33027   non-Latin-1 string with http.client.
33029 - bpo-12923: Reset FancyURLopener's redirect counter even if there is an
33032 - bpo-25945: Fixed a crash when unpickle the functools.partial object with
33037 - bpo-26202: copy.deepcopy() now correctly copies range() objects with
33038   non-atomic attributes.
33040 - bpo-23076: Path.glob() now raises a ValueError if it's called with an
33043 - bpo-19883: Fixed possible integer overflows in zipimport.
33045 - bpo-26227: On Windows, getnameinfo(), gethostbyaddr() and
33047   from the ANSI code page rather than UTF-8.
33049 - bpo-26147: xmlrpc now works with strings not encodable with used non-UTF-8
33052 - bpo-25935: Garbage collector now breaks reference loops with OrderedDict.
33054 - bpo-16620: Fixed AttributeError in msilib.Directory.glob().
33056 - bpo-26013: Added compatibility with broken protocol 2 pickles created in
33059 - bpo-25850: Use cross-compilation by default for 64-bit Windows.
33061 - bpo-17633: Improve zipimport's support for namespace packages.
33063 - bpo-24705: Fix sysconfig._parse_makefile not expanding ${} vars appearing
33066 - bpo-22138: Fix mock.patch behavior when patching descriptors. Restore
33069 - bpo-25672: In the ssl module, enable the SSL_MODE_RELEASE_BUFFERS mode
33070   option if it is safe to do so.
33072 - bpo-26012: Don't traverse into symlinks for ``**`` pattern in
33075 - bpo-24120: Ignore PermissionError when traversing a tree with
33078 - bpo-25447: fileinput now uses sys.stdin as-is if it does not have a buffer
33081 - bpo-25447: Copying the lru_cache() wrapper object now always works,
33085 - bpo-24103: Fixed possible use after free in ElementTree.XMLPullParser.
33087 - bpo-25860: os.fwalk() no longer skips remaining directories when error
33090 - bpo-25914: Fixed and simplified OrderedDict.__sizeof__.
33092 - bpo-25902: Fixed various refcount issues in ElementTree iteration.
33094 - bpo-25717: Restore the previous behaviour of tolerating most fstat()
33098 - bpo-24903: Fix regression in number of arguments compileall accepts when
33099   '-d' is specified.  The check on the number of arguments has been dropped
33102 - bpo-25764: In the subprocess module, preserve any exception caused by
33103   fork() failure when preexec_fn is used.
33105 - bpo-6478: _strptime's regexp cache now is reset after changing timezone
33108 - bpo-14285: When executing a package with the "python -m package" option,
33109   and package initialization fails, a proper traceback is now reported.  The
33113 - bpo-19771: Also in runpy and the "-m" option, omit the irrelevant message
33114   ". . . is a package and cannot be directly executed" if the package could
33117 - bpo-25177: Fixed problem with the mean of very small and very large
33121 - bpo-25718: Fixed copying object with state with boolean value is false.
33123 - bpo-10131: Fixed deep copying of minidom documents.  Based on patch by
33126 - bpo-25725: Fixed a reference leak in pickle.loads() when unpickling
33129 - bpo-25663: In the Readline completer, avoid listing duplicate global
33132 - bpo-25688: Fixed file leak in ElementTree.iterparse() raising an error.
33134 - bpo-23914: Fixed SystemError raised by unpickler on broken pickle data.
33136 - bpo-25691: Fixed crash on deleting ElementTree.Element attributes.
33138 - bpo-25624: ZipFile now always writes a ZIP_STORED header for directory
33141 - Skip getaddrinfo if host is already resolved. Patch by A. Jesse Jiryu
33144 - bpo-26050: Add asyncio.StreamReader.readuntil() method. Patch by Марк
33147 - bpo-25924: Avoid unnecessary serialization of getaddrinfo(3) calls on OS X
33150 - bpo-26406: Avoid unnecessary serialization of getaddrinfo(3) calls on
33153 - bpo-26848: Fix asyncio/subprocess.communicate() to handle empty input.
33156 - bpo-27040: Add loop.get_exception_handler method
33158 - bpo-27041: asyncio: Add loop.create_future method
33160 - bpo-27223: asyncio: Fix _read_ready and _write_ready to respect
33163 - bpo-22970: asyncio: Fix inconsistency cancelling Condition.wait. Patch by
33167 ----
33169 - bpo-5124: Paste with text selected now replaces the selection on X11. This
33173 - bpo-24759: Make clear in idlelib.idle_test.__init__ that the directory is
33176 - bpo-27196: Stop 'ThemeChanged' warnings when running IDLE tests. These
33181 - bpo-20567: Revise idle_test/README.txt with advice about avoiding tk
33184 - bpo-27117: Make colorizer htest and turtledemo work with dark themes. Move
33187 - bpo-26673: When tk reports font size as 0, change to size 10. Such fonts
33190 - bpo-21939: Add test for IDLE's percolator. Original patch by Saimadhav
33193 - bpo-21676: Add test for IDLE's replace dialog. Original patch by Saimadhav
33196 - bpo-18410: Add test for IDLE's search dialog. Original patch by Westley
33199 - bpo-21703: Add test for IDLE's undo delegator. Original patch by Saimadhav
33202 - bpo-27044: Add ConfigDialog.remove_var_callbacks to stop memory leaks.
33204 - bpo-23977: Add more asserts to test_delegator.
33206 - bpo-20640: Add tests for idlelib.configHelpSourceEdit. Patch by Saimadhav
33209 - In the 'IDLE-console differences' section of the IDLE doc, clarify how
33212 - bpo-25507: fix incorrect change in IOBinding that prevented printing.
33215 - bpo-25905: Revert unwanted conversion of ' to ’ RIGHT SINGLE QUOTATION
33216   MARK in README.txt and open this and NEWS.txt with 'ascii'. Re-encode
33217   CREDITS.txt to utf-8 and open it with 'utf-8'.
33220 -------------
33222 - bpo-19489: Moved the search box from the sidebar to the header and footer
33225 - bpo-24136: Document the new :pep:`448` unpacking syntax of 3.5.
33227 - bpo-26736: Used HTTPS for external links in the documentation if possible.
33229 - bpo-6953: Rework the Readline module documentation to group related
33233 - bpo-23606: Adds note to ctypes documentation regarding cdll.msvcrt.
33235 - bpo-25500: Fix documentation to not claim that __import__ is searched for
33238 - bpo-26014: Update 3.x packaging documentation: * "See also" links to the
33243 -----
33245 - bpo-21916: Added tests for the turtle module.  Patch by ingrid, Gregory
33248 - bpo-26523: The multiprocessing thread pool (multiprocessing.dummy.Pool)
33251 - bpo-26015: Added new tests for pickling iterators of mutable sequences.
33253 - bpo-26325: Added test.support.check_no_resource_warning() to check that no
33254   ResourceWarning is emitted.
33256 - bpo-25940: Changed test_ssl to use self-signed.pythontest.net.  This
33259 - bpo-25616: Tests for OrderedDict are extracted from test_collections into
33262 - bpo-26583: Skip test_timestamp_overflow in test_import if bytecode files
33266 -----
33268 - bpo-26884: Fix linking extension modules for cross builds. Patch by Xavier
33271 - bpo-22359: Disable the rules for running _freeze_importlib and pgen when
33272   cross-compiling.  The output of these programs is normally saved with the
33273   source code anyway, and is still regenerated when doing a native build.
33276 - bpo-27229: Fix the cross-compiling pgen rule for in-tree builds.  Patch by
33279 - bpo-21668: Link audioop, _datetime, _ctypes_test modules to libm, except
33282 - bpo-25702: A --with-lto configure option has been added that will enable
33283   link time optimizations at build time during a make profile-opt. Some
33286   provide a few % speed up over profile-opt alone.
33288 - bpo-26624: Adds validation of ucrtbase[d].dll version with warning for old
33291 - bpo-17603: Avoid error about nonexistent fileblocks.o file by using a
33292   lower-level check for st_blocks in struct stat.
33294 - bpo-26079: Fixing the build output folder for tix-8.4.3.6. Patch by Bjoern
33297 - bpo-26465: Update Windows builds to use OpenSSL 1.0.2g.
33299 - bpo-24421: Compile Modules/_math.c once, before building extensions.
33303 - bpo-25348: Added ``--pgo`` and ``--pgo-job`` arguments to
33304   ``PCbuild\build.bat`` for building with Profile-Guided Optimization.  The
33305   old ``PCbuild\build_pgo.bat`` script is now deprecated, and simply calls
33306   ``PCbuild\build.bat --pgo %*``.
33308 - bpo-25827: Add support for building with ICC to ``configure``, including a
33309   new ``--with-icc`` flag.
33311 - bpo-25696: Fix installation of Python on UNIX with make -j9.
33313 - bpo-26930: Update OS X 10.5+ 32-bit-only installer to build and link with
33316 - bpo-26268: Update Windows builds to use OpenSSL 1.0.2f.
33318 - bpo-25136: Support Apple Xcode 7's new textual SDK stub libraries.
33320 - bpo-24324: Do not enable unreachable code warnings when using gcc as the
33322   silently removed as of gcc-4.5.
33325 -------
33327 - bpo-27053: Updates make_zip.py to correctly generate library ZIP file.
33329 - bpo-26268: Update the prepare_ssl.py script to handle OpenSSL releases
33330   that don't include the contents of the include directory (that is, 1.0.2e
33333 - bpo-26071: bdist_wininst created binaries fail to start and find 32bit
33336 - bpo-26073: Update the list of magic numbers in launcher
33338 - bpo-26065: Excludes venv from library when generating embeddable distro.
33340 - bpo-17500: Remove unused and outdated icons. (See also:
33344 -----------
33346 - bpo-26799: Fix python-gdb.py: don't get C types once when the Python code
33347   is loaded, but get C types on demand. The C types can change if
33348   python-gdb.py is loaded before the Python executable. Patch written by
33351 - bpo-26271: Fix the Freeze tool to properly use flags passed through
33354 - bpo-26489: Add dictionary unpacking support to Tools/parser/unparse.py.
33357 - bpo-26316: Fix variable name typo in Argument Clinic.
33363 *Release date: 2015-12-06*
33366 -----------------
33368 - bpo-25709: Fixed problem with in-place string concatenation and utf-8
33372 -------
33374 - bpo-25715: Python 3.5.1 installer shows wrong upgrade path and incorrect
33381 *Release date: 2015-11-22*
33384 -----------------
33386 - bpo-25630: Fix a possible segfault during argument parsing in functions
33389 - bpo-23564: Fixed a partially broken sanity check in the _posixsubprocess
33393 - bpo-25388: Fixed tokenizer crash when processing undecodable source code
33396 - bpo-25462: The hash of the key now is calculated only once in most
33399 - bpo-22995: Default implementation of __reduce__ and __reduce_ex__ now
33402 - bpo-25555: Fix parser and AST: fill lineno and col_offset of "arg" node
33405 - bpo-24802: Avoid buffer overreads when int(), float(), compile(), exec()
33406   and eval() are passed bytes-like objects.  These objects are not
33410 - bpo-24726: Fixed a crash and leaking NULL in repr() of OrderedDict that
33413 - bpo-25449: Iterating OrderedDict with keys with unstable hash now raises
33416 - bpo-25395: Fixed crash when highly nested OrderedDict structures were
33419 - bpo-25274: sys.setrecursionlimit() now raises a RecursionError if the new
33420   recursion limit is too low depending at the current recursion depth.
33421   Modify also the "lower-water mark" formula to make it monotonic. This mark
33422   is used to decide when the overflowed flag of the thread state is reset.
33424 - bpo-24402: Fix input() to prompt to the redirected stdout when
33427 - bpo-24806: Prevent builtin types that are not allowed to be subclassed
33430 - bpo-24848: Fixed a number of bugs in UTF-7 decoding of misformed data.
33432 - bpo-25280: Import trace messages emitted in verbose (-v) mode are no
33435 - bpo-25003: On Solaris 11.3 or newer, os.urandom() now uses the getrandom()
33437   is blocking to generate very good quality entropy, os.urandom() doesn't
33438   need such high-quality entropy.
33440 - bpo-25182: The stdprinter (used as sys.stderr before the io module is
33443 - bpo-25131: Make the line number and column offset of set/dict literals and
33446 - bpo-25150: Hide the private _Py_atomic_xxx symbols from the public
33452 -------
33454 - bpo-25626: Change three zlib functions to accept sizes that fit in
33461 - bpo-25583: Avoid incorrect errors raised by os.makedirs(exist_ok=True)
33464 - bpo-25593: Change semantics of EventLoop.stop() in asyncio.
33466 - bpo-6973: When we know a subprocess.Popen process has died, do not allow
33470 - bpo-25590: In the Readline completer, only call getattr() once per
33473 - bpo-25498: Fix a crash when garbage-collecting ctypes objects created by
33477 - bpo-25584: Added "escape" to the __all__ list in the glob module.
33479 - bpo-25584: Fixed recursive glob() with patterns starting with ``**``.
33481 - bpo-25446: Fix regression in smtplib's AUTH LOGIN support.
33483 - bpo-18010: Fix the pydoc web server's module search function to handle
33486 - bpo-25554: Got rid of circular references in regular expression parsing.
33488 - bpo-25510: fileinput.FileInput.readline() now returns b'' instead of '' at
33492 - bpo-25503: Fixed inspect.getdoc() for inherited docstrings of properties.
33495 - bpo-25515: Always use os.urandom as a source of randomness in uuid.uuid4.
33497 - bpo-21827: Fixed textwrap.dedent() for the case when largest common
33498   whitespace is a substring of smallest leading whitespace. Based on patch
33501 - bpo-25447: The lru_cache() wrapper objects now can be copied and pickled
33504 - bpo-25390: typing: Don't crash on Union[str, Pattern].
33506 - bpo-25441: asyncio: Raise error from drain() when socket is closed.
33508 - bpo-25410: Cleaned up and fixed minor bugs in C implementation of
33511 - bpo-25411: Improved Unicode support in SMTPHandler through better use of
33514 - bpo-25407: Remove mentions of the formatter module being removed in Python
33517 - bpo-25406: Fixed a bug in C implementation of OrderedDict.move_to_end()
33521 - bpo-25364: zipfile now works in threads disabled builds.
33523 - bpo-25328: smtpd's SMTPChannel now correctly raises a ValueError if both
33526 - bpo-25316: distutils raises OSError instead of DistutilsPlatformError when
33527   MSVC is not installed.
33529 - bpo-25380: Fixed protocol for the STACK_GLOBAL opcode in
33532 - bpo-23972: Updates asyncio datagram create method allowing reuseport and
33535   datagram sockets defaults to True if the O/S is 'posix' (except if the
33536   platform is Cygwin). Patch by Chris Laws.
33538 - bpo-25304: Add asyncio.run_coroutine_threadsafe().  This lets you submit a
33542 - bpo-25232: Fix CGIRequestHandler to split the query from the URL at the
33545 - bpo-24657: Prevent CGIRequestHandler from collapsing slashes in the query
33548 - bpo-24483: C implementation of functools.lru_cache() now calculates key's
33551 - bpo-22958: Constructor and update method of weakref.WeakValueDictionary
33554 - bpo-22609: Constructor of collections.UserDict now accepts the self
33557 - bpo-25111: Fixed comparison of traceback.FrameSummary.
33559 - bpo-25262: Added support for BINBYTES8 opcode in Python implementation of
33560   unpickler. Highest 32 bits of 64-bit size for BINUNICODE8 and BINBYTES8
33561   opcodes no longer silently ignored on 32-bit platforms in C
33564 - bpo-25034: Fix string.Formatter problem with auto-numbering and nested
33567 - bpo-25233: Rewrite the guts of asyncio.Queue and asyncio.Semaphore to be
33570 - bpo-25203: Failed readline.set_completer_delims() no longer left the
33573 - bpo-23600: Default implementation of tzinfo.fromutc() was returning wrong
33576 - bpo-23329: Allow the ssl module to be built with older versions of
33579 - Prevent overflow in _Unpickler_Read.
33581 - bpo-25047: The XML encoding declaration written by Element Tree now
33583   write encoding names in uppercase like "UTF-8", which worked in Python 2.
33585 - bpo-25135: Make deque_clear() safer by emptying the deque before clearing.
33588 - bpo-19143: platform module now reads Windows version from kernel32.dll to
33591 - bpo-25092: Fix datetime.strftime() failure when errno was already set to
33594 - bpo-23517: Fix rounding in fromtimestamp() and utcfromtimestamp() methods
33603 - bpo-25155: Fix datetime.datetime.now() and datetime.datetime.utcnow() on
33607 - bpo-25108: Omitted internal frames in traceback functions print_stack(),
33610 - bpo-25118: Fix a regression of Python 3.5.0 in os.waitpid() on Windows.
33612 - bpo-24684: socket.socket.getaddrinfo() now calls
33615   doesn't return a byte string. The encoder of the IDNA codec is now called
33618 - bpo-25060: Correctly compute stack usage of the BUILD_MAP opcode.
33620 - bpo-24857: Comparing call_args to a long sequence now correctly returns a
33623 - bpo-23144: Make sure that HTMLParser.feed() returns all the data, even
33624   when convert_charrefs is True.
33626 - bpo-24982: shutil.make_archive() with the "zip" format now adds entries
33629 - bpo-25019: Fixed a crash caused by setting non-string key of expat parser.
33632 - bpo-16180: Exit pdb if file has syntax error, instead of trapping user in
33635 - bpo-24891: Fix a race condition at Python startup if the file descriptor
33636   of stdin (0), stdout (1) or stderr (2) is closed while Python is creating
33641 - bpo-24992: Fix error handling and a race condition (related to garbage
33644 - bpo-24881: Fixed setting binary mode in Python implementation of FileIO on
33647 - bpo-25578: Fix (another) memory leak in SSLSocket.getpeercer().
33649 - bpo-25530: Disable the vulnerable SSLv3 protocol by default when creating
33652 - bpo-25569: Fix memory leak in SSLSocket.getpeercert().
33654 - bpo-25471: Sockets returned from accept() shouldn't appear to be
33657 - bpo-25319: When threading.Event is reinitialized, the underlying condition
33660 - bpo-21112: Fix regression in unittest.expectedFailure on subclasses. Patch
33663 - bpo-24764: cgi.FieldStorage.read_multi() now ignores the Content-Length
33667 - bpo-24913: Fix overrun error in deque.index(). Found by John Leitch and
33670 - bpo-24774: Fix docstring in http.server.test. Patch from Chiu-Hsiang Hsu.
33672 - bpo-21159: Improve message in
33675 - bpo-20362: Honour TestCase.longMessage correctly in assertRegex. Patch
33678 - bpo-23572: Fixed functools.singledispatch on classes with falsy
33681 - asyncio: ensure_future() now accepts awaitable objects.
33684 ----
33686 - bpo-15348: Stop the debugger engine (normally in a user process) before
33690 - bpo-24455: Prevent IDLE from hanging when a) closing the shell while the
33691   debugger is active (15347); b) closing the debugger with the [X] button
33698 - Change 'The program' to 'Your program' in an IDLE 'kill program?' message
33699   to make it clearer that the program referred to is the currently running
33702 - bpo-24750: Improve the appearance of the IDLE editor window status bar.
33705 - bpo-25313: Change the handling of new built-in text color themes to better
33709 - bpo-24782: Extension configuration is now a tab in the IDLE Preferences
33713 - bpo-22726: Re-activate the config dialog help button with some content
33716 - bpo-24820: IDLE now has an 'IDLE Dark' built-in text color theme. It is
33723 - bpo-25224: README.txt is now an idlelib index for IDLE developers and
33724   curious users. The previous user content is now in the IDLE doc chapter.
33727 - bpo-24820: Users can now set breakpoint colors in Settings -> Custom
33730 - bpo-24972: Inactive selection background now matches active selection
33734 - bpo-24570: Idle: make calltip and completion boxes appear on Macs affected
33737 - bpo-24988: Idle ScrolledList context menus (used in debugger) now work on
33740 - bpo-24801: Make right-click for context menu work on Mac Aqua. Patch by
33743 - bpo-25173: Associate tkinter messageboxes with a specific widget. For Mac
33746 - bpo-25198: Enhance the initial html viewer now used for Idle Help.
33747   Properly indent fixed-pitch text (patch by Mark Roseman). Give code
33748   snippet a very Sphinx-like light blueish-gray background. Re-use initial
33750   Contents (TOC) menu is used, put the section header at the top of the
33753 - bpo-25225: Condense and rewrite Idle doc section on text colors.
33755 - bpo-21995: Explain some differences between IDLE and console Python.
33757 - bpo-22820: Explain need for *print* when running file from Idle editor.
33759 - bpo-25224: Doc: augment Idle feature list and no-subprocess section.
33761 - bpo-25219: Update doc for Idle command line options. Some were missing and
33764 - bpo-24861: Most of idlelib is private and subject to change. Use
33767 - bpo-25199: Idle: add synchronization comments for future maintainers.
33769 - bpo-16893: Replace help.txt with help.html for Idle doc display. The new
33770   idlelib/help.html is rstripped Doc/build/html/library/idle.html. It looks
33776 - bpo-24199: Deprecate unused idlelib.idlever with possible removal in 3.6.
33778 - bpo-24790: Remove extraneous code (which also create 2 & 3 conflicts).
33781 -------------
33783 - bpo-22558: Add remaining doc links to source code for Python-coded
33786 - bpo-12067: Rewrite Comparisons section in the Expressions chapter of the
33787   language reference. Some of the details of comparing mixed types were
33788   incorrect or ambiguous. NotImplemented is only relevant at a lower level
33790   and default behaviour and consistency suggestions for user-defined
33793 - bpo-24952: Clarify the default size argument of stack_size() in the
33796 - bpo-23725: Overhaul tempfile docs. Note deprecated status of mktemp. Patch
33797   from Zbigniew Jędrzejewski-Szmek.
33799 - bpo-24808: Update the types of some PyTypeObject fields.  Patch by Joseph
33802 - bpo-22812: Fix unittest discovery examples. Patch from Pam McA'Nulty.
33805 -----
33807 - bpo-25449: Added tests for OrderedDict subclasses.
33809 - bpo-25099: Make test_compileall not fail when an entry on sys.path cannot
33812 - bpo-23919: Prevents assert dialogs appearing in the test suite.
33814 - ``PCbuild\rt.bat`` now accepts an unlimited number of arguments to pass
33818 -----
33820 - bpo-24915: Add LLVM support for PGO builds and use the test suite to
33823 - bpo-24910: Windows MSIs now have unique display names.
33825 - bpo-24986: It is now possible to build Python on Windows without errors
33829 -------
33831 - bpo-25450: Updates shortcuts to start Python in installation directory.
33833 - bpo-25164: Changes default all-users install directory to match per-user
33836 - bpo-25143: Improves installer error messages for unsupported platforms.
33838 - bpo-25163: Display correct directory in installer when using non-default
33841 - bpo-25361: Disables use of SSE2 instructions in Windows 32-bit build
33843 - bpo-25089: Adds logging to installer for case where launcher is not
33846 - bpo-25165: Windows uninstallation should not remove launcher if other
33849 - bpo-25112: py.exe launcher is missing icons
33851 - bpo-25102: Windows installer does not precompile for -O or -OO.
33853 - bpo-25081: Makes Back button in installer go back to upgrade page when
33856 - bpo-25091: Increases font size of the installer.
33858 - bpo-25126: Clarifies that the non-web installer will download some
33861 - bpo-25213: Restores requestedExecutionLevel to manifest to disable UAC
33864 - bpo-25022: Removed very outdated PC/example_nt/ directory.
33867 -----------
33869 - bpo-25440: Fix output of python-config --extension-suffix.
33875 *Release date: 2015-09-13*
33878 -----
33880 - bpo-25071: Windows installer should not require TargetDir parameter when
33887 *Release date: 2015-09-09*
33890 -------
33892 - bpo-25029: Fixes MemoryError in test_strptime.
33895 -----
33897 - bpo-25027: Reverts partial-static build options and adds vcruntime140.dll
33904 *Release date: 2015-09-07*
33907 -----------------
33909 - bpo-24305: Prevent import subsystem stack frames from being counted by the
33912 - bpo-24912: Prevent __class__ assignment to immutable built-in objects.
33914 - bpo-24975: Fix AST compilation for :pep:`448` syntax.
33917 -------
33919 - bpo-24917: time_strftime() buffer over-read.
33921 - bpo-24748: To resolve a compatibility problem found with py2exe and
33926 - bpo-24635: Fixed a bug in typing.py where isinstance([], typing.Iterable)
33929 - bpo-24989: Fixed buffer overread in BytesIO.readline() if a position is
33932 - bpo-24913: Fix overrun error in deque.index(). Found by John Leitch and
33939 *Release date: 2015-08-25*
33942 -----------------
33944 - bpo-24769: Interpreter now starts properly when dynamic loading is
33947 - bpo-21167: NAN operations are now handled correctly when python is
33948   compiled with ICC even if -fp-model strict is not specified.
33950 - bpo-24492: A "package" lacking a __name__ attribute when trying to perform
33955 -------
33957 - bpo-24847: Removes vcruntime140.dll dependency from Tcl/Tk.
33959 - bpo-24839: platform._syscmd_ver raises DeprecationWarning
33961 - bpo-24867: Fix Task.get_stack() for 'async def' coroutines
33967 *Release date: 2015-08-09*
33970 -----------------
33972 - bpo-24667: Resize odict in all cases that the underlying dict resizes.
33975 -------
33977 - bpo-24824: Signatures of codecs.encode() and codecs.decode() now are
33980 - bpo-24634: Importing uuid should not try to load libc on Windows
33982 - bpo-24798: _msvccompiler.py doesn't properly support manifests
33984 - bpo-4395: Better testing and documentation of binary operators. Patch by
33987 - bpo-23973: Update typing.py from GitHub repo.
33989 - bpo-23004: mock_open() now reads binary data correctly when the type of
33990   read_data is bytes.  Initial patch by Aaron Hill.
33992 - bpo-23888: Handle fractional time in cookie expiry. Patch by ssh.
33994 - bpo-23652: Make it possible to compile the select module against the libc
33998 - bpo-22932: Fix timezones in email.utils.formatdate. Patch from Dmitry
34001 - bpo-23779: imaplib raises TypeError if authenticator tries to abort. Patch
34004 - bpo-23319: Fix ctypes.BigEndianStructure, swap correctly bytes. Patch
34007 - bpo-23254: Document how to close the TCPServer listening socket. Patch
34010 - bpo-19450: Update Windows and OS X installer builds to use SQLite 3.8.11.
34012 - bpo-17527: Add PATCH to wsgiref.validator. Patch from Luca Sbardella.
34014 - bpo-24791: Fix grammar regression for call syntax: 'g(\*a or b)'.
34017 ----
34019 - bpo-23672: Allow Idle to edit and run files with astral chars in name.
34022 - bpo-24745: Idle editor default font. Switch from Courier to
34023   platform-sensitive TkFixedFont.  This should not affect current customized
34024   font selections.  If there is a problem, edit
34025   $HOME/.idlerc/config-main.cfg and remove 'fontxxx' entries from [Editor
34028 - bpo-21192: Idle editor. When a file is run, put its name in the restart
34031 - bpo-13884: Idle menus. Remove tearoff lines. Patch by Roger Serwy.
34034 -------------
34036 - bpo-24129: Clarify the reference documentation for name resolution. This
34041 - bpo-20769: Improve reload() docs. Patch by Dorian Pula.
34043 - bpo-23589: Remove duplicate sentence from the FAQ.  Patch by Yongzhi Pan.
34045 - bpo-24729: Correct IO tutorial to match implementation regarding encoding
34049 -----
34051 - bpo-24751: When running regrtest with the ``-w`` command line option, a
34052   test run is no longer marked as a failure if all tests succeed when
34053   re-run.
34059 *Release date: 2015-07-26*
34062 -----------------
34064 - bpo-23573: Restored optimization of bytes.rfind() and bytearray.rfind()
34065   for single-byte argument on Linux.
34067 - bpo-24569: Make :pep:`448` dictionary evaluation more consistent.
34069 - bpo-24583: Fix crash when set is mutated while being updated.
34071 - bpo-24407: Fix crash when dict is mutated while being updated.
34073 - bpo-24619: New approach for tokenizing async/await. As a consequence, it
34074   is now possible to have one-line 'async def foo(): await ..' functions.
34076 - bpo-24687: Plug refleak on SyntaxError in function parameters annotations.
34078 - bpo-15944: memoryview: Allow arbitrary formats when casting to bytes.
34082 -------
34084 - bpo-23441: rcompleter now prints a tab character instead of displaying
34087 - bpo-24683: Fixed crashes in _json functions called with arguments of
34090 - bpo-21697: shutil.copytree() now correctly handles symbolic links that
34093 - bpo-14373: Fixed segmentation fault when gc.collect() is called during
34096 - bpo-24695: Fix a regression in traceback.print_exception().  If
34097   exc_traceback is None we shouldn't print a traceback header like described
34100 - bpo-24620: Random.setstate() now validates the value of state last
34103 - bpo-22485: Fixed an issue that caused `inspect.getsource` to return
34106 - bpo-22153: Improve unittest docs. Patch from Martin Panter and evilzero.
34108 - bpo-24580: Symbolic group references to open group in re patterns now are
34111 - bpo-24206: Fixed __eq__ and __ne__ methods of inspect classes.
34113 - bpo-24631: Fixed regression in the timeit module with multiline setup.
34115 - bpo-18622: unittest.mock.mock_open().reset_mock would recurse infinitely.
34118 - bpo-23661: unittest.mock side_effects can now be exceptions again. This
34121 - bpo-24608: chunk.Chunk.read() now always returns bytes, not str.
34123 - bpo-18684: Fixed reading out of the buffer in the re module.
34125 - bpo-24259: tarfile now raises a ReadError if an archive is truncated
34128 - bpo-15014: SMTP.auth() and SMTP.login() now support RFC 4954's optional
34129   initial-response argument to the SMTP AUTH command.
34131 - bpo-24669: Fix inspect.getsource() for 'async def' functions. Patch by Kai
34134 - bpo-24688: ast.get_docstring() for 'async def' functions.
34137 -----
34139 - bpo-24603: Update Windows builds and OS X 10.5 installer to use OpenSSL
34146 *Release date: 2015-07-05*
34149 -----------------
34151 - bpo-24467: Fixed possible buffer over-read in bytearray. The bytearray
34153   now is always null-terminated.
34155 - Upgrade to Unicode 8.0.0.
34157 - bpo-24345: Add Py_tp_finalize slot for the stable ABI.
34159 - bpo-24400: Introduce a distinct type for :pep:`492` coroutines; add
34167   collections.abc.Coroutine can no longer be used to detect generator-based
34168   coroutines--use inspect.isawaitable instead.
34170 - bpo-24450: Add gi_yieldfrom to generators and cr_await to coroutines.
34173 - bpo-19235: Add new RecursionError exception. Patch by Georg Brandl.
34176 -------
34178 - bpo-21750: mock_open.read_data can now be read from each instance, as it
34181 - bpo-24552: Fix use after free in an error case of the _pickle module.
34183 - bpo-24514: tarfile now tolerates number fields consisting of only
34186 - bpo-19176: Fixed doctype() related bugs in C implementation of
34189   warning.  Parser's doctype() now is not called if target's doctype() is
34192 - bpo-20387: Restore semantic round-trip correctness in tokenize/untokenize
34193   for tab-indented blocks.
34195 - bpo-24456: Fixed possible buffer over-read in adpcm2lin() and lin2adpcm()
34198 - bpo-24336: The contextmanager decorator now works with functions with
34201 - bpo-24522: Fix possible integer overflow in json accelerator module.
34203 - bpo-24489: ensure a previously set C errno doesn't disturb cmath.polar().
34205 - bpo-24408: Fixed AttributeError in measure() and metrics() methods of
34208 - bpo-14373: C implementation of functools.lru_cache() now can be used with
34211 - bpo-24347: Set KeyError if PyDict_GetItemWithError returns NULL.
34213 - bpo-24348: Drop superfluous incref/decref.
34215 - bpo-24359: Check for changed OrderedDict size during iteration.
34217 - bpo-24368: Support keyword arguments in OrderedDict methods.
34219 - bpo-24362: Simplify the C OrderedDict fast nodes resize logic.
34221 - bpo-24377: Fix a ref leak in OrderedDict.__repr__.
34223 - bpo-24369: Defend against key-changes during iteration.
34226 -----
34228 - bpo-24373: _testmultiphase and xxlimited now use tp_traverse and
34233 -------------
34235 - bpo-24458: Update documentation to cover multi-phase initialization for
34238 - bpo-24351: Clarify what is meant by "identifier" in the context of
34242 -----
34244 - bpo-24432: Update Windows builds and OS X 10.5 installer to use OpenSSL
34251 *Release date: 2015-05-31*
34254 -----------------
34256 - bpo-24284: The startswith and endswith methods of the str class no longer
34260 - bpo-24115: Update uses of PyObject_IsTrue(), PyObject_Not(),
34264 - bpo-24328: Fix importing one character extension modules.
34266 - bpo-11205: In dictionary displays, evaluate the key before the value.
34268 - bpo-24285: Fixed regression that prevented importing extension modules
34272 -------
34274 - bpo-23247: Fix a crash in the StreamWriter.reset() of CJK codecs.
34276 - bpo-24270: Add math.isclose() and cmath.isclose() functions as per
34279 - bpo-5633: Fixed timeit when the statement is a string and the setup is
34282 - bpo-24326: Fixed audioop.ratecv() with non-default weightB argument.
34285 - bpo-16991: Add a C implementation of OrderedDict.
34287 - bpo-23934: Fix inspect.signature to fail correctly for builtin types
34294 *Release date: 2015-05-24*
34297 -----------------
34299 - bpo-24276: Fixed optimization of property descriptor getter.
34301 - bpo-24268: PEP 489: Multi-phase extension module initialization. Patch by
34304 - bpo-23955: Add pyvenv.cfg option to suppress registry/environment lookup
34307 - bpo-24257: Fixed system error in the comparison of faked
34310 - bpo-22939: Fixed integer overflow in iterator object.  Patch by Clement
34313 - bpo-23985: Fix a possible buffer overrun when deleting a slice from the
34316 - bpo-24102: Fixed exception type checking in standard error handlers.
34318 - bpo-15027: The UTF-32 encoder is now 3x to 7x faster.
34320 - bpo-23290: Optimize set_merge() for cases where the target is empty.
34323 - bpo-2292: PEP 448: Additional Unpacking Generalizations.
34325 - bpo-24096: Make warnings.warn_explicit more robust against mutation of the
34328 - bpo-23996: Avoid a crash when a delegated generator raises an unnormalized
34331 - bpo-23910: Optimize property() getter calls.  Patch by Joe Jevnik.
34333 - bpo-23911: Move path-based importlib bootstrap code to a separate frozen
34336 - bpo-24192: Fix namespace package imports.
34338 - bpo-24022: Fix tokenizer crash when processing undecodable source code.
34340 - bpo-9951: Added a hex() method to bytes, bytearray, and memoryview.
34342 - bpo-22906: PEP 479: Change StopIteration handling inside generators.
34344 - bpo-24017: PEP 492: Coroutines with async and await syntax.
34347 -------
34349 - bpo-14373: Added C implementation of functools.lru_cache().  Based on
34352 - bpo-24230: The tempfile module now accepts bytes for prefix, suffix and
34356 - bpo-22189: collections.UserString now supports __getnewargs__(),
34360 - bpo-24244: Prevents termination when an invalid format string is
34363 - bpo-23973: PEP 484: Add the typing module.
34365 - bpo-23086: The collections.abc.Sequence() abstract base class added
34369 - bpo-20035: Replaced the ``tkinter._fix`` module used for setting up the
34373 - bpo-24257: Fixed segmentation fault in sqlite3.Row constructor with faked
34376 - bpo-15836: assertRaises(), assertRaisesRegex(), assertWarns() and
34378   prevent possible user error.  Based on patch by Daniel Wagner-Hall.
34380 - bpo-9858: Add missing method stubs to _io.RawIOBase.  Patch by Laura
34383 - bpo-22955: attrgetter, itemgetter and methodcaller objects in the operator
34387 - bpo-22107: tempfile.gettempdir() and tempfile.mkdtemp() now try again when
34389   Unix. tempfile.mkstemp() now fails early if parent directory is not valid
34390   (not exists or is a file) on Windows.
34392 - bpo-23780: Improved error message in os.path.join() with single argument.
34394 - bpo-6598: Increased time precision and random number range in
34397 - bpo-24091: Fixed various crashes in corner cases in C implementation of
34400 - bpo-21931: msilib.FCICreate() now raises TypeError in the case of a bad
34404 - bpo-13866: *quote_via* argument added to urllib.parse.urlencode.
34406 - bpo-20098: New mangle_from policy option for email, default True for
34409 - bpo-24211: The email library now supports RFC 6532: it can generate
34410   headers using utf-8 instead of encoded words.
34412 - bpo-16314: Added support for the LZMA compression in distutils.
34414 - bpo-21804: poplib now supports RFC 6856 (UTF8).
34416 - bpo-18682: Optimized pprint functions for builtin scalar types.
34418 - bpo-22027: smtplib now supports RFC 6531 (SMTPUTF8).
34420 - bpo-23488: Random generator objects now consume 2x less memory on 64-bit.
34422 - bpo-1322: platform.dist() and platform.linux_distribution() functions are
34425 - bpo-22486: Added the math.gcd() function.  The fractions.gcd() function
34426   now is deprecated.  Based on patch by Mark Dickinson.
34428 - bpo-24064: Property() docstrings are now writeable. (Patch by Berker
34431 - bpo-22681: Added support for the koi8_t encoding.
34433 - bpo-22682: Added support for the kz1048 encoding.
34435 - bpo-23796: peek and read1 methods of BufferedReader now raise ValueError
34438 - bpo-21795: smtpd now supports the 8BITMIME extension whenever the new
34439   *decode_data* constructor argument is set to False.
34441 - bpo-24155: optimize heapq.heapify() for better cache performance when
34444 - bpo-21800: imaplib now supports RFC 5161 (enable), RFC 6855
34445   (utf8/internationalized email) and automatically encodes non-ASCII
34448 - bpo-20274: When calling a _sqlite.Connection, it now complains if passed
34451 - bpo-20274: Remove ignored and erroneous "kwargs" parameters from three
34454 - bpo-24134: assertRaises(), assertRaisesRegex(), assertWarns() and
34455   assertWarnsRegex() checks now emits a deprecation warning when callable is
34456   None or keyword arguments except msg is passed in the context manager
34459 - bpo-24018: Add a collections.abc.Generator abstract base class.
34462 - bpo-23880: Tkinter's getint() and getdouble() now support Tcl_Obj.
34465 - bpo-22619: Added negative limit support in the traceback module. Based on
34468 - bpo-24094: Fix possible crash in json.encode with poorly behaved dict
34471 - bpo-9246: On POSIX, os.getcwd() now supports paths longer than 1025 bytes.
34474 - bpo-17445: add difflib.diff_bytes() to support comparison of byte strings
34477 - bpo-23917: Fall back to sequential compilation when ProcessPoolExecutor
34480 - bpo-23008: Fixed resolving attributes with boolean value is False in
34483 - Fix asyncio issue 235: LifoQueue and PriorityQueue's put didn't increment
34487 - bpo-23908: os functions now reject paths with embedded null character on
34490 - bpo-23728: binascii.crc_hqx() could return an integer outside of the range
34491   0-0xffff for empty data.
34493 - bpo-23887: urllib.error.HTTPError now has a proper repr() representation.
34496 - asyncio: New event loop APIs: set_task_factory() and get_task_factory().
34498 - asyncio: async() function is deprecated in favour of ensure_future().
34500 - bpo-24178: asyncio.Lock, Condition, Semaphore, and BoundedSemaphore
34503 - bpo-24179: Support 'async for' for asyncio.StreamReader. Contributed by
34506 - bpo-24184: Add AsyncIterator and AsyncIterable ABCs to collections.abc.
34509 - bpo-22547: Implement informative __repr__ for inspect.BoundArguments.
34512 - bpo-24190: Implement inspect.BoundArgument.apply_defaults() method.
34515 - bpo-20691: Add 'follow_wrapped' argument to
34519 - bpo-24248: Deprecate inspect.Signature.from_function() and
34522 - bpo-23898: Fix inspect.classify_class_attrs() to support attributes with
34525 - bpo-24298: Fix inspect.signature() to correctly unwrap wrappers around
34529 ----
34531 - bpo-23184: remove unused names and imports in idlelib. Initial patch by Al
34535 -----
34537 - bpo-21520: test_zipfile no longer fails if the word 'bad' appears anywhere
34540 - bpo-9517: Move script_helper into the support package. Patch by Christie
34544 -------------
34546 - bpo-22155: Add File Handlers subsection with createfilehandler to tkinter
34549 - bpo-24029: Document the name binding behavior for submodule imports.
34551 - bpo-24077: Fix typo in man page for -I command option: -s, not -S
34554 -----------
34556 - bpo-24000: Improved Argument Clinic's mapping of converters to legacy
34559 - bpo-24001: Argument Clinic converters now use accept={type} instead of
34562 - bpo-23330: h2py now supports arbitrary filenames in #include.
34564 - bpo-24031: make patchcheck now supports git checkouts, too.
34570 *Release date: 2015-04-19*
34573 -----------------
34575 - bpo-22980: Under Linux, GNU/KFreeBSD and the Hurd, C extensions now
34578   extension name now includes :pep:`3149`-style information.
34580 - bpo-22631: Added Linux-specific socket constant CAN_RAW_FD_FRAMES. Patch
34583 - bpo-23731: Implement :pep:`488`: removal of .pyo files.
34585 - bpo-23726: Don't enable GC for user subclasses of non-GC types that don't
34588 - bpo-23309: Avoid a deadlock at shutdown if a daemon thread is aborted
34589   while it is holding a lock to a buffered I/O object, and the main thread
34591   error is emitted instead.
34593 - bpo-22977: Fixed formatting Windows error messages on Wine. Patch by
34596 - bpo-23466: %c, %o, %x, and %X in bytes formatting now raise TypeError on
34597   non-integer input.
34599 - bpo-24044: Fix possible null pointer dereference in list.sort in out of
34602 - bpo-21354: PyCFunction_New function is exposed by python DLL again.
34605 -------
34607 - bpo-23840: tokenize.open() now closes the temporary binary file on error
34610 - bpo-16914: new debuglevel 2 in smtplib adds timestamps to debug output.
34612 - bpo-7159: urllib.request now supports sending auth credentials
34613   automatically after the first 401.  This enhancement is a superset of the
34616 - bpo-23703: Fix a regression in urljoin() introduced in 901e4e52b20a. Patch
34619 - bpo-4254: Adds _curses.update_lines_cols().  Patch by Arnon Yaari
34621 - bpo-19933: Provide default argument for ndigits in round. Patch by
34624 - bpo-23193: Add a numeric_owner parameter to tarfile.TarFile.extract and
34627 - bpo-23342: Add a subprocess.run() function than returns a CalledProcess
34630 - bpo-21217: inspect.getsourcelines() now tries to compute the start and end
34631   lines from the code object, fixing an issue when a lambda function is used
34634 - bpo-24521: Fix possible integer overflows in the pickle module.
34636 - bpo-22931: Allow '[' and ']' in cookie values.
34638 - The keywords attribute of functools.partial is now always a dictionary.
34640 - bpo-23811: Add missing newline to the PyCompileError error message. Patch
34643 - bpo-21116: Avoid blowing memory when allocating a multiprocessing shared
34647 - bpo-22982: Improve BOM handling when seeking to multiple positions of a
34650 - bpo-23464: Removed deprecated asyncio JoinableQueue.
34652 - bpo-23529: Limit the size of decompressed data when reading from GzipFile,
34657 - bpo-21859: Added Python implementation of io.FileIO.
34659 - bpo-23865: close() methods in multiple modules now are idempotent and more
34663 - bpo-23400: Raise same exception on both Python 2 and 3 if sem_open is not
34666 - bpo-10838: The subprocess now module includes SubprocessError and
34670 - bpo-23411: Added DefragResult, ParseResult, SplitResult,
34674 - bpo-23881: urllib.request.ftpwrapper constructor now closes the socket if
34677 - bpo-23853: :meth:`socket.socket.sendall` does no more reset the socket
34678   timeout each time data is sent successfully. The socket timeout is now the
34681 - bpo-22721: An order of multiline pprint output of set or dict containing
34682   orderable and non-orderable elements no longer depends on iteration order
34685 - bpo-15133: _tkinter.tkapp.getboolean() now supports Tcl_Obj and always
34690 - bpo-10590: xml.sax.parseString() now supports string argument.
34692 - bpo-23338: Fixed formatting ctypes error messages on Cygwin. Patch by
34695 - bpo-15582: inspect.getdoc() now follows inheritance chains.
34697 - bpo-2175: SAX parsers now support a character stream of InputSource
34700 - bpo-16840: Tkinter now supports 64-bit integers added in Tcl 8.4 and
34703 - bpo-23834: Fix socket.sendto(), use the C Py_ssize_t type to store the
34706 - bpo-23618: :meth:`socket.socket.connect` now waits until the connection
34707   completes instead of raising :exc:`InterruptedError` if the connection is
34709   socket is blocking or has a timeout. :meth:`socket.socket.connect` still
34710   raise :exc:`InterruptedError` for non-blocking sockets.
34712 - bpo-21526: Tkinter now supports new boolean type in Tcl 8.5.
34714 - bpo-23836: Fix the faulthandler module to handle reentrant calls to its
34717 - bpo-23838: linecache now clears the cache and returns an empty result on
34720 - bpo-10395: Added os.path.commonpath(). Implemented in posixpath and
34723 - bpo-23611: Serializing more "lookupable" objects (such as unbound methods
34726 - bpo-13583: sqlite3.Row now supports slice indexing.
34728 - bpo-18473: Fixed 2to3 and 3to2 compatible pickle mappings.  Fixed
34729   ambiguous reverse mappings.  Added many new mappings.  Import mapping is
34732 - bpo-23485: select.select() is now retried automatically with the
34734   handler raises an exception. This change is part of the :pep:`475`.
34736 - bpo-23752: When built from an existing file descriptor, io.FileIO() now
34740 - bpo-23704: collections.deque() objects now support __add__, __mul__, and
34743 - bpo-23171: csv.Writer.writerow() now supports arbitrary iterables.
34745 - bpo-23745: The new email header parser now handles duplicate MIME
34748 - bpo-22117: Fix os.utime(), it now rounds the timestamp towards minus
34749   infinity (-inf) instead of rounding towards zero.
34751 - bpo-23310: Fix MagicMock's initializer to work with __methods__, just like
34755 -----
34757 - bpo-23817: FreeBSD now uses "1.0" in the SOVERSION as other operating
34760 - bpo-23501: Argument Clinic now generates code into separate files by
34764 -----
34766 - bpo-23799: Added test.support.start_threads() for running and cleaning up
34769 - bpo-22390: test.regrtest now emits a warning if temporary files or
34773 -----------
34775 - bpo-18128: pygettext now uses standard +NNNN format in the
34776   POT-Creation-Date header.
34778 - bpo-23935: Argument Clinic's understanding of format units accepting
34779   bytes, bytearrays, and buffers is now consistent with both the
34782 - bpo-23944: Argument Clinic now wraps long impl prototypes at column 78.
34784 - bpo-20586: Argument Clinic now ensures that functions without docstrings
34787 - bpo-23492: Argument Clinic now generates argument parsing code with
34790 - bpo-23500: Argument Clinic is now smarter about generating the "#ifndef"
34797 -----
34799 - bpo-23998: PyImport_ReInitLock() now checks for lock allocation error
34805 *Release date: 2015-03-28*
34808 -----------------
34810 - bpo-23573: Increased performance of string search operations (str.find,
34814 - bpo-23753: Python doesn't support anymore platforms without stat() or
34817 - bpo-23681: The -b option now affects comparisons of bytes with int.
34819 - bpo-23632: Memoryviews now allow tuple indexing (including for
34820   multi-dimensional memoryviews).
34822 - bpo-23192: Fixed generator lambdas.  Patch by Bruno Cauet.
34824 - bpo-23629: Fix the default __sizeof__ implementation for variable-sized
34828 -------
34830 - bpo-14260: The groupindex attribute of regular expression pattern object
34831   now is non-modifiable mapping.
34833 - bpo-23792: Ignore KeyboardInterrupt when the pydoc pager is active. This
34835   from shutting down while the pager itself is still running.
34837 - bpo-23775: pprint() of OrderedDict now outputs the same representation as
34840 - bpo-23765: Removed IsBadStringPtr calls in ctypes
34842 - bpo-22364: Improved some re error messages using regex for hints.
34844 - bpo-23742: ntpath.expandvars() no longer loses unbalanced single quotes.
34846 - bpo-21717: The zipfile.ZipFile.open function now supports 'x' (exclusive
34849 - bpo-21802: The reader in BufferedRWPair now is closed even when closing
34852 - bpo-23622: Unknown escapes in regular expressions that consist of ``'\'``
34856 - bpo-23671: string.Template now allows specifying the "self" parameter as a
34860 - bpo-23502: The pprint module now supports mapping proxies.
34862 - bpo-17530: pprint now wraps long bytes objects and bytearrays.
34864 - bpo-22687: Fixed some corner cases in breaking words in tetxtwrap. Got rid
34867 - bpo-4727: The copy module now uses pickle protocol 4 (PEP 3154) and
34869   keyword-only arguments.
34871 - bpo-23491: Added a zipapp module to support creating executable zip file
34875 - bpo-23657: Avoid explicit checks for str in zipapp, adding support for
34878 - bpo-23688: Added support of arbitrary bytes-like objects and avoided
34882 - bpo-23252: Added support for writing ZIP files to unseekable streams.
34884 - bpo-23647: Increase imaplib's MAXLINE to accommodate modern mailbox sizes.
34886 - bpo-23539: If body is None, http.client.HTTPConnection.request now sets
34887   Content-Length to 0 for PUT, POST, and PATCH headers to avoid 411 errors
34890 - bpo-22351: The nntplib.NNTP constructor no longer leaves the connection
34894 - bpo-23704: collections.deque() objects now support methods for index(),
34898 - bpo-23715: :func:`signal.sigwaitinfo` and :func:`signal.sigtimedwait` are
34901   recomputes the timeout with a monotonic clock when it is retried.
34903 - bpo-23001: Few functions in modules mmap, ossaudiodev, socket, ssl, and
34904   codecs, that accepted only read-only bytes-like object now accept writable
34905   bytes-like object too.
34907 - bpo-23646: If time.sleep() is interrupted by a signal, the sleep is now
34911 - bpo-23136: _strptime now uniformly handles all days in week 0, including
34914 - bpo-23700: Iterator of NamedTemporaryFile now keeps a reference to
34917 - bpo-22903: The fake test case created by unittest.loader when it fails
34918   importing a test module is now picklable.
34920 - bpo-22181: On Linux, os.urandom() now uses the new getrandom() syscall if
34921   available, syscall introduced in the Linux kernel 3.17. It is more
34925 - bpo-2211: Updated the implementation of the http.cookies.Morsel class.
34926   Setting attributes key, value and coded_value directly now is deprecated.
34933 - bpo-18983: Allow selection of output units in timeit. Patch by Julian
34936 - bpo-23631: Fix traceback.format_list when a traceback has been mutated.
34938 - bpo-23568: Add rdivmod support to MagicMock() objects. Patch by Håkan
34941 - bpo-2052: Add charset parameter to HtmlDiff.make_file().
34943 - bpo-23668: Support os.truncate and os.ftruncate on Windows.
34945 - bpo-23138: Fixed parsing cookies with absent keys or values in cookiejar.
34948 - bpo-23051: multiprocessing.Pool methods imap() and imap_unordered() now
34952 - bpo-23581: Add matmul support to MagicMock. Patch by Håkan Lövdahl.
34954 - bpo-23566: enable(), register(), dump_traceback() and
34958 - bpo-22928: Disabled HTTP header injections in http.client. Original patch
34961 - bpo-23615: Modules bz2, tarfile and tokenize now can be reloaded with
34964 - bpo-23605: os.walk() now calls os.scandir() instead of os.listdir(). The
34969 -----
34971 - bpo-23585: make patchcheck will ensure the interpreter is built.
34974 -----
34976 - bpo-23583: Added tests for standard IO streams in IDLE.
34978 - bpo-22289: Prevent test_urllib2net failures due to ftp connection timeout.
34981 -----------
34983 - bpo-22826: The result of open() in Tools/freeze/bkfile.py is now better
34991 *Release date: 2015-03-09*
34994 -----------------
34996 - bpo-23571: PyObject_Call() and PyCFunction_Call() now raise a SystemError
34997   if a function returns a result and raises an exception. The SystemError is
35001 -------
35003 - bpo-22524: New os.scandir() function, part of the :pep:`471`:
35004   "os.scandir() function -- a better and faster directory iterator". Patch
35007 - bpo-23103: Reduced the memory consumption of IPv4Address and IPv6Address.
35009 - bpo-21793: BaseHTTPRequestHandler again logs response code as numeric, not
35012 - bpo-23476: In the ssl module, enable OpenSSL's X509_V_FLAG_TRUSTED_FIRST
35013   flag on certificate stores when it is available.
35015 - bpo-23576: Avoid stalling in SSL reads when EOF has been reached in the
35018 - bpo-23504: Added an __all__ to the types module.
35020 - bpo-23563: Optimized utility functions in urllib.parse.
35022 - bpo-7830: Flatten nested functools.partial.
35024 - bpo-20204: Added the __module__ attribute to _tkinter classes.
35026 - bpo-19980: Improved help() for non-recognized strings.  help('') now shows
35030 - bpo-23521: Corrected pure python implementation of timedelta division.
35034 - bpo-21619: Popen objects no longer leave a zombie after exit in the with
35037 - bpo-22936: Make it possible to show local variables in tracebacks for both
35040 - bpo-15955: Add an option to limit the output size in bz2.decompress().
35043 - bpo-6639: Module-level turtle functions no longer raise TclError after
35046 - bpo-814253: Group references and conditional group references now work in
35047   lookbehind assertions in regular expressions. (See also: bpo-9179)
35049 - bpo-23215: Multibyte codecs with custom error handlers that ignores errors
35053 - bpo-5700: io.FileIO() called flush() after closing the file. flush() was
35056 - bpo-23374: Fixed pydoc failure with non-ASCII files when stdout encoding
35059 - bpo-23481: Remove RC4 from the SSL module's default cipher list.
35061 - bpo-21548: Fix pydoc.synopsis() and pydoc.apropos() on modules with empty
35064 - bpo-22885: Fixed arbitrary code execution vulnerability in the dbm.dumb
35067 - bpo-23239: ssl.match_hostname() now supports matching of IP addresses.
35069 - bpo-23146: Fix mishandling of absolute Windows paths with forward slashes
35072 - bpo-23096: Pickle representation of floats with protocol 0 now is the same
35075 - bpo-19105: pprint now more efficiently uses free space at the right.
35077 - bpo-14910: Add allow_abbrev parameter to argparse.ArgumentParser. Patch by
35080 - bpo-21717: tarfile.open() now supports 'x' (exclusive creation) mode.
35082 - bpo-23344: marshal.dumps() is now 20-25% faster on average.
35084 - bpo-20416: marshal.dumps() with protocols 3 and 4 is now 40-50% faster on
35087 - bpo-23421: Fixed compression in tarfile CLI.  Patch by wdv4758h.
35089 - bpo-23367: Fix possible overflows in the unicodedata module.
35091 - bpo-23361: Fix possible overflow in Windows subprocess creation code.
35093 - logging.handlers.QueueListener now takes a respect_handler_level keyword
35097 - bpo-19705: turtledemo now has a visual sorting algorithm demo.  Original
35100 - bpo-23801: Fix issue where cgi.FieldStorage did not always ignore the
35104 -----
35106 - bpo-23445: pydebug builds now use "gcc -Og" where possible, to make the
35109 - bpo-23686: Update OS X 10.5 installer build to use OpenSSL 1.0.2a.
35112 -----
35114 - bpo-20204: Deprecation warning is now raised for builtin types without the
35118 -------
35120 - bpo-23465: Implement :pep:`486` - Make the Python Launcher aware of
35123 - bpo-23437: Make user scripts directory versioned on Windows. Patch by Paul
35130 *Release date: 2015-02-08*
35133 -----------------
35135 - bpo-23285: PEP 475 - EINTR handling.
35137 - bpo-22735: Fix many edge cases (including crashes) involving custom mro()
35140 - bpo-22896: Avoid using PyObject_AsCharBuffer(), PyObject_AsReadBuffer()
35143 - bpo-21295: Revert some changes (issue #16795) to AST line numbers and
35146 - bpo-22986: Allow changing an object's __class__ between a dynamic type and
35149 - bpo-15859: PyUnicode_EncodeFSDefault(), PyUnicode_EncodeMBCS() and
35150   PyUnicode_EncodeCodePage() now raise an exception if the object is not a
35154 - bpo-21408: The default __ne__() now returns NotImplemented if __eq__()
35157 - bpo-23321: Fixed a crash in str.decode() when error handler returned
35160 - bpo-22286: The "backslashreplace" error handlers now works with decoding
35163 - bpo-23253: Delay-load ShellExecute[AW] in os.startfile for reduced startup
35166 - bpo-22038: pyatomic.h now uses stdatomic.h or GCC built-in functions for
35170 - bpo-20284: %-interpolation (aka printf) formatting added for bytes and
35173 - bpo-23048: Fix jumping out of an infinite while loop in the pdb.
35175 - bpo-20335: bytes constructor now raises TypeError when encoding or errors
35176   is specified with non-string argument.  Based on patch by Renaud Blanch.
35178 - bpo-22834: If the current working directory ends up being set to a
35179   non-existent directory then import will no longer raise FileNotFoundError.
35181 - bpo-22869: Move the interpreter startup & shutdown code to a new dedicated
35184 - bpo-22847: Improve method cache efficiency.
35186 - bpo-22335: Fix crash when trying to enlarge a bytearray to 0x7fffffff
35187   bytes on a 32-bit platform.
35189 - bpo-22653: Fix an assertion failure in debug mode when doing a reentrant
35192 - bpo-22643: Fix integer overflow in Unicode case operations (upper, lower,
35195 - bpo-17636: Circular imports involving relative imports are now supported.
35197 - bpo-22604: Fix assertion error in debug mode when dividing a complex
35200 - bpo-21052: Do not raise ImportWarning when sys.path_hooks or sys.meta_path
35203 - bpo-16518: Use 'bytes-like object required' in error messages that
35207 - bpo-22470: Fixed integer overflow issues in "backslashreplace",
35210 - bpo-22540: speed up `PyObject_IsInstance` and `PyObject_IsSubclass` in the
35211   common case that the second argument has metaclass `type`.
35213 - bpo-18711: Add a new `PyErr_FormatV` function, similar to `PyErr_Format`
35216 - bpo-22520: Fix overflow checking when generating the repr of a unicode
35219 - bpo-22519: Fix overflow checking in PyBytes_Repr.
35221 - bpo-22518: Fix integer overflow issues in latin-1 encoding.
35223 - bpo-16324: _charset parameter of MIMEText now also accepts
35226 - bpo-1764286: Fix inspect.getsource() to support decorated functions. Patch
35229 - bpo-18554: os.__all__ includes posix functions.
35231 - bpo-21391: Use os.path.abspath in the shutil module.
35233 - bpo-11471: avoid generating a JUMP_FORWARD instruction at the end of an
35234   if-block if there is no else-clause.  Original patch by Eugene Toder.
35236 - bpo-22215: Now ValueError is raised instead of TypeError when str or bytes
35239 - bpo-22258: Fix the internal function set_inheritable() on Illumos. This
35241   with errno is ENOTTY: "Inappropriate ioctl for device". set_inheritable()
35245 - bpo-21389: Displaying the __qualname__ of the underlying function in the
35248 - bpo-22206: Using pthread, PyThread_create_key() now sets errno to ENOMEM
35249   and returns -1 (error) on integer overflow.
35251 - bpo-20184: Argument Clinic based signature introspection added for 30 of
35254 - bpo-22116: C functions and methods (of the 'builtin_function_or_method'
35257 - bpo-22077: Improve index error messages for bytearrays, bytes, lists, and
35261 - bpo-20179: Apply Argument Clinic to bytes and bytearray. Patch by Tal
35264 - bpo-22082: Clear interned strings in slotdefs.
35266 - Upgrade Unicode database to Unicode 7.0.0.
35268 - bpo-21897: Fix a crash with the f_locals attribute with closure variables
35271 - bpo-21205: Add a new ``__qualname__`` attribute to generator, the
35274   attribute) is now get from the function instead of the code. Use
35277 - bpo-21669: With the aid of heuristics in SyntaxError.__init__, the parser
35281 - bpo-21642: In the conditional if-else expression, allow an integer written
35285 - bpo-21523: Fix over-pessimistic computation of the stack effect of some
35290 - bpo-21418: Fix a crash in the builtin function super() when called without
35293 - bpo-21425: Fix flushing of standard streams in the interactive
35296 - bpo-21435: In rare cases, when running finalizers on objects in cyclic
35300 - bpo-21377: PyBytes_Concat() now tries to concatenate in-place when the
35303 - bpo-20355: -W command line options now have higher priority than the
35306 - bpo-21274: Define PATH_MAX for GNU/Hurd in Python/pythonrun.c.
35308 - bpo-20904: Support setting FPU precision on m68k.
35310 - bpo-21209: Fix sending tuples to custom generator objects with the yield
35313 - bpo-21193: pow(a, b, c) now raises ValueError rather than TypeError when b
35314   is negative. Patch by Josh Rosenberg.
35316 - bpo-21176: PEP 465: Add the '@' operator for matrix multiplication.
35318 - bpo-21134: Fix segfault when str is called on an uninitialized
35321 - bpo-19537: Fix PyUnicode_DATA() alignment under m68k.  Patch by Andreas
35324 - bpo-20929: Add a type cast to avoid shifting a negative number.
35326 - bpo-20731: Properly position in source code files even if they are opened
35329 - bpo-20637: Key-sharing now also works for instance dictionaries of
35332 - bpo-8297: Attributes missing from modules now include the module name in
35335 - bpo-19995: %c, %o, %x, and %X now raise TypeError on non-integer input.
35337 - bpo-19655: The ASDL parser - used by the build process to generate code
35338   for managing the Python AST in C - was rewritten. The new parser is self
35339   contained and does not require to carry long the spark.py parser-generator
35342 - bpo-12546: Allow ``\x00`` to be used as a fill character when using str,
35345 - bpo-20480: Add ipaddress.reverse_pointer. Patch by Leon Weber.
35347 - bpo-13598: Modify string.Formatter to support auto-numbering of
35351 - bpo-8931: Make alternate formatting ('#') for type 'c' raise an exception.
35352   In versions prior to 3.5, '#' with 'c' had no effect. Now specifying it is
35355 - bpo-23165: Perform overflow checks before allocating memory in the
35359 -------
35361 - bpo-23399: pyvenv creates relative symlinks where possible.
35363 - bpo-20289: cgi.FieldStorage() now supports the context management
35366 - bpo-13128: Print response headers for CONNECT requests when debuglevel >
35369 - bpo-15381: Optimized io.BytesIO to make less allocations and copyings.
35371 - bpo-22818: Splitting on a pattern that could match an empty string now
35375 - bpo-23099: Closing io.BytesIO with exported buffer is rejected now to
35378 - bpo-23326: Removed __ne__ implementations.  Since fixing default __ne__
35381 - bpo-23363: Fix possible overflow in itertools.permutations.
35383 - bpo-23364: Fix possible overflow in itertools.product.
35385 - bpo-23366: Fixed possible integer overflow in itertools.combinations.
35387 - bpo-23369: Fixed possible integer overflow in
35390 - bpo-23353: Fix the exception handling of generators in
35392   PyEval_EvalFrameEx() is called with throwflag=0. At exit, the exception
35393   state is now always restored or swapped, not only if why is WHY_YIELD or
35394   WHY_RETURN. Patch co-written with Antoine Pitrou.
35396 - bpo-14099: Restored support of writing ZIP files to tellable but
35397   non-seekable streams.
35399 - bpo-14099: Writing to ZipFile and reading multiple ZipExtFiles is
35402 - bpo-19361: JSON decoder now raises JSONDecodeError instead of ValueError.
35404 - bpo-18518: timeit now rejects statements which can't be compiled outside a
35407 - bpo-23094: Fixed readline with frames in Python implementation of pickle.
35409 - bpo-23268: Fixed bugs in the comparison of ipaddress classes.
35411 - bpo-21408: Removed incorrect implementations of __ne__() which didn't
35415 - bpo-19996: :class:`email.feedparser.FeedParser` now handles (malformed)
35418 - bpo-20188: Support Application-Layer Protocol Negotiation (ALPN) in the
35421 - bpo-23133: Pickling of ipaddress objects now produces more compact and
35424 - bpo-23248: Update ssl error codes from latest OpenSSL git master.
35426 - bpo-23266: Much faster implementation of ipaddress.collapse_addresses()
35427   when there are many non-consecutive addresses.
35429 - bpo-23098: 64-bit dev_t is now supported in the os module.
35431 - bpo-21817: When an exception is raised in a task submitted to a
35432   ProcessPoolExecutor, the remote traceback is now displayed in the parent
35435 - bpo-15955: Add an option to limit output size when decompressing LZMA
35438 - bpo-23250: In the http.cookies module, capitalize "HttpOnly" and "Secure"
35441 - bpo-23063: In the distutils' check command, fix parsing of reST with code
35442   or code-block directives.
35444 - bpo-23209: selectors.BaseSelector.get_key() now raises a RuntimeError if
35445   the selector is closed. And selectors.BaseSelector.close() now clears its
35447   Initial patch written by Martin Richard. (See also: bpo-23225)
35449 - bpo-17911: Provide a way to seed the linecache for a PEP-302 module
35452 - bpo-17911: Provide a new object API for traceback, including the ability
35453   to not lookup lines at all until the traceback is actually rendered,
35456 - bpo-19777: Provide a home() classmethod on Path objects.  Contributed by
35459 - bpo-23206: Make ``json.dumps(..., ensure_ascii=False)`` as fast as the
35462 - bpo-23185: Add math.inf and math.nan constants.
35464 - bpo-23186: Add ssl.SSLObject.shared_ciphers() and
35468 - bpo-23143: Remove compatibility with OpenSSLs older than 0.9.8.
35470 - bpo-23132: Improve performance and introspection support of comparison
35473 - bpo-19776: Add an expanduser() method on Path objects.
35475 - bpo-23112: Fix SimpleHTTPServer to correctly carry the query string and
35478 - bpo-21793: Added http.HTTPStatus enums (i.e. HTTPStatus.OK,
35481 - bpo-23093: In the io, module allow more operations to work on detached
35484 - bpo-23111: In the ftplib, make ssl.PROTOCOL_SSLv23 the default protocol
35487 - bpo-22585: On OpenBSD 5.6 and newer, os.urandom() now calls getentropy(),
35488   instead of reading /dev/urandom, to get pseudo-random bytes.
35490 - bpo-19104: pprint now produces evaluable output for wrapped strings.
35492 - bpo-23071: Added missing names to codecs.__all__.  Patch by Martin Panter.
35494 - bpo-22783: Pickling now uses the NEWOBJ opcode instead of the NEWOBJ_EX
35497 - bpo-15513: Added a __sizeof__ implementation for pickle classes.
35499 - bpo-19858: pickletools.optimize() now aware of the MEMOIZE opcode, can
35503 - bpo-22095: Fixed HTTPConnection.set_tunnel with default port.  The port
35506 - bpo-23016: A warning no longer produces an AttributeError when the program
35507   is run with pythonw.exe.
35509 - bpo-21775: shutil.copytree(): fix crash when copying to VFAT. An exception
35511   That is not the case, so the exception handler itself raised
35512   AttributeError when run on Linux (and, presumably, any other non-Windows
35515 - bpo-1218234: Fix inspect.getsource() to load updated source of reloaded
35518 - bpo-21740: Support wrapped callables in doctest. Patch by Claudiu Popa.
35520 - bpo-23009: Make sure selectors.EpollSelector.select() works when no FD is
35523 - bpo-22959: In the constructor of http.client.HTTPSConnection, prefer the
35526 - bpo-22696: Add function :func:`sys.is_finalizing` to know about
35529 - bpo-16043: Add a default limit for the amount of data
35530   xmlrpclib.gzip_decode will return. This resolves CVE-2013-1753.
35532 - bpo-14099: ZipFile.open() no longer reopen the underlying file.  Objects
35534   even if the ZipFile was created by passing in a file-like object as the
35537 - bpo-22966: Fix __pycache__ pyc file name clobber when pyc_compile is asked
35540 - bpo-21971: Update turtledemo doc and add module to the index.
35542 - bpo-21032: Fixed socket leak if HTTPConnection.getresponse() fails.
35545 - bpo-22407: Deprecated the use of re.LOCALE flag with str patterns or
35548 - bpo-22902: The "ip" command is now used on Linux to determine MAC address
35551 - bpo-22960: Add a context argument to xmlrpclib.ServerProxy constructor.
35553 - bpo-22389: Add contextlib.redirect_stderr().
35555 - bpo-21356: Make ssl.RAND_egd() optional to support LibreSSL. The
35556   availability of the function is checked during the compilation. Patch
35559 - bpo-22915: SAX parser now supports files opened with file descriptor or
35562 - bpo-22609: Constructors and update methods of mapping classes in the
35565 - bpo-22940: Add readline.append_history_file.
35567 - bpo-19676: Added the "namereplace" error handler.
35569 - bpo-22788: Add *context* parameter to logging.handlers.HTTPHandler.
35571 - bpo-22921: Allow SSLContext to take the *hostname* parameter even if
35574 - bpo-22894: TestCase.subTest() would cause the test suite to be stopped
35577 - bpo-22796: HTTP cookie parsing is now stricter, in order to protect
35580 - bpo-22370: Windows detection in pathlib is now more robust.
35582 - bpo-22841: Reject coroutines in asyncio add_signal_handler(). Patch by
35585 - bpo-19494: Added urllib.request.HTTPBasicPriorAuthHandler. Patch by Matej
35588 - bpo-22578: Added attributes to the re.error class.
35590 - bpo-22849: Fix possible double free in the io.TextIOWrapper constructor.
35592 - bpo-12728: Different Unicode characters having the same uppercase but
35593   different lowercase are now matched in case-insensitive regular
35596 - bpo-22821: Fixed fcntl() with integer argument on 64-bit big-endian
35599 - bpo-21650: Add an `--sort-keys` option to json.tool CLI.
35601 - bpo-22824: Updated reprlib output format for sets to use set literals.
35604 - bpo-22824: Updated reprlib output format for arrays to display empty
35607 - bpo-22406: Fixed the uu_codec codec incorrectly ported to 3.x. Based on
35610 - bpo-17293: uuid.getnode() now determines MAC address on AIX using netstat.
35613 - bpo-22769: Fixed ttk.Treeview.tag_has() when called without arguments.
35615 - bpo-22417: Verify certificates by default in httplib (PEP 476).
35617 - bpo-22775: Fixed unpickling of http.cookies.SimpleCookie with protocol 2
35620 - bpo-22776: Brought excluded code into the scope of a try block in
35623 - bpo-22665: Add missing get_terminal_size and SameFileError to
35626 - bpo-6623: Remove deprecated Netrc class in the ftplib module. Patch by
35629 - bpo-17381: Fixed handling of case-insensitive ranges in regular
35632 - bpo-22410: Module level functions in the re module now cache compiled
35633   locale-dependent regular expressions taking into account the locale.
35635 - bpo-22759: Query methods on pathlib.Path() (exists(), is_dir(), etc.) now
35638 - bpo-8876: distutils now falls back to copying files when hard linking
35642 - bpo-22217: Implemented reprs of classes in the zipfile module.
35644 - bpo-22457: Honour load_tests in the start_dir of discovery.
35646 - bpo-18216: gettext now raises an error when a .mo file has an unsupported
35649 - bpo-13918: Provide a locale.delocalize() function which can remove
35650   locale-specific number formatting from a string representing a number,
35653 - bpo-22676: Make the pickling of global objects which don't have a
35656 - bpo-18853: Fixed ResourceWarning in shlex.__nain__.
35658 - bpo-9351: Defaults set with set_defaults on an argparse subparser are no
35661 - bpo-7559: unittest test loading ImportErrors are reported as import errors
35665 - bpo-19746: Make it possible to examine the errors from unittest discovery
35667   exposes these non-fatal errors encountered during discovery.
35669 - bpo-21991: Make email.headerregistry's header 'params' attributes be
35670   read-only (MappingProxyType).  Previously the dictionary was modifiable
35673 - bpo-22638: SSLv3 is now disabled throughout the standard library. It can
35676 - bpo-22641: In asyncio, the default SSL context for client connections is
35679 - bpo-17401: Include closefd in io.FileIO repr.
35681 - bpo-21338: Add silent mode for compileall. quiet parameters of
35682   compile_{dir, file, path} functions now have a multilevel value. Also, -q
35685 - bpo-20152: Convert the array and cmath modules to Argument Clinic.
35687 - bpo-18643: Add socket.socketpair() on Windows.
35689 - bpo-22435: Fix a file descriptor leak when socketserver bind fails.
35691 - bpo-13096: Fixed segfault in CTypes POINTER handling of large values.
35693 - bpo-11694: Raise ConversionError in xdrlib as documented.  Patch by Filip
35696 - bpo-19380: Optimized parsing of regular expressions.
35698 - bpo-1519638: Now unmatched groups are replaced with empty strings in
35701 - bpo-18615: sndhdr.what/whathdr now return a namedtuple.
35703 - bpo-22462: Fix pyexpat's creation of a dummy frame to make it appear in
35706 - bpo-21965: Add support for in-memory SSL to the ssl module.  Patch by
35709 - bpo-21173: Fix len() on a WeakKeyDictionary when .clear() was called with
35712 - bpo-11866: Eliminated race condition in the computation of names for new
35715 - bpo-21905: Avoid RuntimeError in pickle.whichmodule() when sys.modules is
35718 - bpo-11271: concurrent.futures.Executor.map() now takes a *chunksize*
35722 - bpo-21883: os.path.join() and os.path.relpath() now raise a TypeError with
35726 - bpo-22219: The zipfile module CLI now adds entries for directories
35729 - bpo-22449: In the ssl.SSLContext.load_default_certs, consult the
35732 - bpo-22508: The email.__version__ variable has been removed; the email code
35733   is no longer shipped separately from the stdlib, and __version__ hasn't
35736 - bpo-20076: Added non derived UTF-8 aliases to locale aliases table.
35738 - bpo-20079: Added locales supported in glibc 2.18 to locale alias table.
35740 - bpo-20218: Added convenience methods read_text/write_text and read_bytes/
35743 - bpo-22396: On 32-bit AIX platform, don't expose os.posix_fadvise() nor
35746 - bpo-22517: When an io.BufferedRWPair object is deallocated, clear its
35749 - bpo-22437: Number of capturing groups in regular expression is no longer
35752 - bpo-17442: InteractiveInterpreter now displays the full chained traceback
35756 - bpo-23392: Added tests for marshal C API that works with FILE*.
35758 - bpo-10510: distutils register and upload methods now use HTML standards
35761 - bpo-9850: Fixed macpath.join() for empty first component.  Patch by Oleg
35764 - bpo-5309: distutils' build and build_ext commands now accept a ``-j``
35767 - bpo-22448: Improve canceled timer handles cleanup to prevent unbound
35768   memory usage. Patch by Joshua Moore-Oliva.
35770 - bpo-22427: TemporaryDirectory no longer attempts to clean up twice when
35773 - bpo-22362: Forbidden ambiguous octal escapes out of range 0-0o377 in
35776 - bpo-20912: Now directories added to ZIP file have correct Unix and MS-DOS
35779 - bpo-21866: ZipFile.close() no longer writes ZIP64 central directory
35780   records if allowZip64 is false.
35782 - bpo-22278: Fix urljoin problem with relative urls, a regression observed
35785 - bpo-22415: Fixed debugging output of the GROUPREF_EXISTS opcode in the re
35788 - bpo-22423: Unhandled exception in thread no longer causes unhandled
35789   AttributeError when sys.stderr is None.
35791 - bpo-21332: Ensure that ``bufsize=1`` in subprocess.Popen() selects line
35794 - bpo-21091: Fix API bug: email.message.EmailMessage.is_attachment is now a
35797 - bpo-21079: Fix email.message.EmailMessage.is_attachment to return the
35800 - bpo-22247: Add NNTPError to nntplib.__all__.
35802 - bpo-22366: urllib.request.urlopen will accept a context object
35806 - bpo-4180: The warnings registries are now reset when the filters are
35809 - bpo-22419: Limit the length of incoming HTTP request in wsgiref server to
35813 - Lax cookie parsing in http.cookies could be a security issue when combined
35814   with non-standard cookie handling in some web browsers.  Reported by
35817 - bpo-20537: logging methods now accept an exception instance as well as a
35820 - bpo-22384: An exception in Tkinter callback no longer crashes the program
35821   when it is run with pythonw.exe.
35823 - bpo-22168: Prevent turtle AttributeError with non-default Canvas on OS X.
35825 - bpo-21147: sqlite3 now raises an exception if the request contains a null
35828 - bpo-13968: The glob module now supports recursive search in subdirectories
35831 - bpo-21951: Fixed a crash in Tkinter on AIX when called Tcl command with
35834 - bpo-21951: Tkinter now most likely raises MemoryError instead of crash if
35837 - bpo-22338: Fix a crash in the json module on memory allocation failure.
35839 - bpo-12410: imaplib.IMAP4 now supports the context management protocol.
35842 - bpo-21270: We now override tuple methods in mock.call objects so that they
35845 - bpo-16662: load_tests() is now unconditionally run when it is present in a
35847   use_load_tests, but it is deprecated and ignored.  A new keyword-only
35848   attribute `pattern` is added and documented.  Patch given by Robert
35851 - bpo-22226: First letter no longer is stripped from the "status" key in the
35854 - bpo-19524: Fixed resource leak in the HTTP connection when an invalid
35855   response is received.  Patch by Martin Panter.
35857 - bpo-20421: Add a .version() method to SSL sockets exposing the actual
35860 - bpo-19546: configparser exceptions no longer expose implementation
35864 - bpo-22051: turtledemo no longer reloads examples to re-run them.
35866   is called each time a demo is run, but not on import.
35868 - bpo-21933: Turtledemo users can change the code font size with a menu
35869   selection or control(command) '-' or '+' or control-mousewheel. Original
35872 - bpo-21597: The separator between the turtledemo text pane and the drawing
35878 - bpo-18132: Turtledemo buttons no longer disappear when the window is
35881 - bpo-22043: time.monotonic() is now always available.
35884   timeout is used.
35886 - bpo-21527: Add a default number of workers to ThreadPoolExecutor equal to
35889 - bpo-22216: smtplib now resets its state more completely after a quit.  The
35893 - bpo-22098: ctypes' BigEndianStructure and LittleEndianStructure now define
35897 - bpo-22185: Fix an occasional RuntimeError in threading.Condition.wait()
35901 - bpo-22287: On UNIX, _PyTime_gettimeofday() now uses
35906 - bpo-22182: Use e.args to unpack exceptions correctly in
35909 - The webbrowser module now uses subprocess's start_new_session=True rather
35912 - bpo-22042: signal.set_wakeup_fd(fd) now raises an exception if the file
35913   descriptor is in blocking mode.
35915 - bpo-16808: inspect.stack() now returns a named tuple instead of a tuple.
35918 - bpo-22236: Fixed Tkinter images copying operations in NoDefaultRoot mode.
35920 - bpo-2527: Add a *globals* argument to timeit functions, in order to
35921   override the globals namespace in which the timed code is executed. Patch
35924 - bpo-22118: Switch urllib.parse to use RFC 3986 semantics for the
35928 - bpo-21549: Added the "members" parameter to TarFile.list().
35930 - bpo-19628: Allow compileall recursion depth to be specified with a -r
35933 - bpo-15696: Add a __sizeof__ implementation for mmap objects on Windows.
35935 - bpo-22068: Avoided reference loops with Variables and Fonts in Tkinter.
35937 - bpo-22165: SimpleHTTPRequestHandler now supports undecodable file names.
35939 - bpo-15381: Optimized line reading in io.BytesIO.
35941 - bpo-8797: Raise HTTPError on failed Basic Authentication immediately.
35944 - bpo-20729: Restored the use of lazy iterkeys()/itervalues()/iteritems() in
35947 - bpo-21448: Changed FeedParser feed() to avoid O(N\ :sup:`2`) behavior when
35950 - bpo-22184: The functools LRU Cache decorator factory now gives an earlier
35953 - bpo-17923: glob() patterns ending with a slash no longer match non-dirs on
35956 - bpo-21725: Added support for RFC 6531 (SMTPUTF8) in smtpd.
35958 - bpo-22176: Update the ctypes module's libffi to v3.1.  This release adds
35962 - bpo-5411: Added support for the "xztar" format in the shutil module.
35964 - bpo-21121: Don't force 3rd party C extensions to be built with
35965   -Werror=declaration-after-statement.
35967 - bpo-21975: Fixed crash when using uninitialized sqlite3.Row (in particular
35968   when unpickling pickled sqlite3.Row).  sqlite3.Row is now initialized in
35971 - bpo-20170: Convert posixmodule to use Argument Clinic.
35973 - bpo-21539: Add an *exists_ok* argument to `Pathlib.mkdir()` to mimic
35974   `mkdir -p` and `os.makedirs()` functionality.  When true, ignore
35977 - bpo-22127: Bypass IDNA for pure-ASCII host names in the socket module (in
35980 - bpo-21047: set the default value for the *convert_charrefs* argument of
35983 - Add an __all__ to html.entities.
35985 - bpo-15114: the strict mode and argument of HTMLParser, HTMLParser.error,
35988 - bpo-22085: Dropped support of Tk 8.3 in Tkinter.
35990 - bpo-21580: Now Tkinter correctly handles bytes arguments passed to Tk. In
35993 - bpo-22003: When initialized from a bytes object, io.BytesIO() now defers
35994   making a copy until it is mutated, improving performance and memory use on
35997 - bpo-22018: On Windows, signal.set_wakeup_fd() now also supports sockets. A
35998   side effect is that Python depends to the WinSock library.
36000 - bpo-22054: Add os.get_blocking() and os.set_blocking() functions to get
36002   flag is set, True otherwise). These functions are not available on
36005 - bpo-17172: Make turtledemo start as active on OS X even when run with
36008 - bpo-21704: Fix build error for _multiprocessing when semaphores are not
36011 - bpo-20173: Convert sha1, sha256, sha512 and md5 to ArgumentClinic. Patch
36014 - Fix repr(_socket.socket) on Windows 64-bit: don't fail with OverflowError
36017 - bpo-22033: Reprs of most Python implemented classes now contain actual
36020 - bpo-21947: The dis module can now disassemble generator-iterator objects
36023 - bpo-16133: The asynchat.async_chat.handle_read() method now ignores
36026 - bpo-22044: Fixed premature DECREF in call_tzinfo_method. Patch by Tom
36029 - bpo-19884: readline: Disable the meta modifier key if stdout is not a
36031   sequence is used on some terminal (ex: TERM=xterm-256color") to enable
36034 - bpo-4350: Removed a number of out-of-dated and non-working for a long time
36037 - bpo-6167: Scrollbar.activate() now returns the name of active element if
36038   the argument is not specified.  Scrollbar.set() now always accepts only 2
36041 - bpo-15275: Clean up and speed up the ntpath module.
36043 - bpo-21888: plistlib's load() and loads() now work if the fmt parameter is
36046 - bpo-22032: __qualname__ instead of __name__ is now always used to format
36049 - bpo-22031: Reprs now always use hexadecimal format with the "0x" prefix
36052 - bpo-22018: signal.set_wakeup_fd() now raises an OSError instead of a
36055 - bpo-21044: tarfile.open() now handles fileobj with an integer 'name'
36058 - bpo-21966: Respect -q command-line option when code module is ran.
36060 - bpo-19076: Don't pass the redundant 'file' argument to self.error().
36062 - bpo-16382: Improve exception message of warnings.warn() for bad category.
36065 - bpo-21932: os.read() now uses a :c:func:`Py_ssize_t` type instead of
36067   Windows, the size is truncated to INT_MAX. As any call to os.read(), the
36070 - bpo-21942: Fixed source file viewing in pydoc's server mode on Windows.
36072 - bpo-11259: asynchat.async_chat().set_terminator() now raises a ValueError
36073   if the number of received bytes is negative.
36075 - bpo-12523: asynchat.async_chat.push() now raises a TypeError if it doesn't
36078 - bpo-21707: Add missing kwonlyargcount argument to
36081 - bpo-20639: calling Path.with_suffix('') allows removing the suffix again.
36084 - bpo-21714: Disallow the construction of invalid paths using
36087 - bpo-15014: Added 'auth' method to smtplib to make implementing auth
36090 - bpo-21151: Fixed a segfault in the winreg module when ``None`` is passed
36093 - bpo-21090: io.FileIO.readall() does not ignore I/O errors anymore. Before,
36096 - bpo-5800: headers parameter of wsgiref.headers.Headers is now optional.
36099 - bpo-21781: ssl.RAND_add() now supports strings longer than 2 GB.
36101 - bpo-21679: Prevent extraneous fstat() calls during open().  Patch by
36104 - bpo-21863: cProfile now displays the module name of C extension functions,
36107 - bpo-11453: asyncore: emit a ResourceWarning when an unclosed file_wrapper
36108   object is destroyed. The destructor now closes the file if needed. The
36109   close() method can now be called twice: the second call does nothing.
36111 - bpo-21858: Better handling of Python exceptions in the sqlite3 module.
36113 - bpo-21476: Make sure the email.parser.BytesParser TextIOWrapper is
36116 - bpo-20295: imghdr now recognizes OpenEXR format images.
36118 - bpo-21729: Used the "with" statement in the dbm.dumb module to ensure
36121 - bpo-21491: socketserver: Fix a race condition in child processes reaping.
36123 - bpo-21719: Added the ``st_file_attributes`` field to os.stat_result on
36126 - bpo-21832: Require named tuple inputs to be exact strings.
36128 - bpo-21722: The distutils "upload" command now exits with a non-zero return
36131 - bpo-21723: asyncio.Queue: support any type of number (ex: float) for the
36134 - bpo-21711: support for "site-python" directories has now been removed from
36137 - bpo-17552: new socket.sendfile() method allowing a file to be sent over a
36138   socket by using high-performance os.sendfile() on UNIX. Patch by Giampaolo
36141 - bpo-18039: dbm.dump.open() now always creates a new database when the flag
36144 - bpo-21326: Add a new is_closed() method to asyncio.BaseEventLoop.
36148 - bpo-21766: Prevent a security hole in CGIHTTPServer by URL unquoting paths
36151 - bpo-21310: Fixed possible resource leak in failed open().
36153 - bpo-21256: Printout of keyword args should be in deterministic order in a
36156 - bpo-21677: Fixed chaining nonnormalized exceptions in io close() methods.
36158 - bpo-11709: Fix the pydoc.help function to not fail when sys.stdin is not a
36161 - bpo-21515: tempfile.TemporaryFile now uses os.O_TMPFILE flag is available.
36163 - bpo-13223: Fix pydoc.writedoc so that the HTML documentation for methods
36164   that use 'self' in the example code is generated correctly.
36166 - bpo-21463: In urllib.request, fix pruning of the FTP cache.
36168 - bpo-21618: The subprocess module could fail to close open fds that were
36171   or /dev/fd interface the max is now ignored and all fds are closed.
36173 - bpo-20383: Introduce importlib.util.module_from_spec() as the preferred
36176 - bpo-21552: Fixed possible integer overflow of too long string lengths in
36177   the tkinter module on 64-bit platforms.
36179 - bpo-14315: The zipfile module now ignores extra fields in the central
36182   world zip files in the wild and is ignored by other zip tools.
36184 - bpo-13742: Added "key" and "reverse" parameters to heapq.merge(). (First
36187 - bpo-21402: tkinter.ttk now works when default root window is not set.
36189 - bpo-3015: _tkinter.create() now creates tkapp object with wantobject=1 by
36192 - bpo-10203: sqlite3.Row now truly supports sequence protocol.  In
36196 - bpo-18807: If copying (no symlinks) specified for a venv, then the python
36200 - bpo-20197: Added support for the WebP image type in the imghdr module.
36203 - bpo-21513: Speedup some properties of IP addresses (IPv4Address,
36206 - bpo-21137: Improve the repr for threading.Lock() and its variants by
36209 - bpo-21538: The plistlib module now supports loading of binary plist files
36210   when reference or offset size is not a power of two.
36212 - bpo-21455: Add a default backlog to socket.listen().
36214 - bpo-21525: Most Tkinter methods which accepted tuples now accept lists
36217 - bpo-22166: With the assistance of a new internal _codecs._forget_codec
36221 - bpo-22236: Tkinter tests now don't reuse default root window.  New root
36222   window is created for every test class.
36224 - bpo-10744: Fix :pep:`3118` format strings on ctypes objects with a
36227 - bpo-20826: Optimize ipaddress.collapse_addresses().
36229 - bpo-21487: Optimize ipaddress.summarize_address_range() and
36232 - bpo-21486: Optimize parsing of netmasks in ipaddress.IPv4Network and
36235 - bpo-13916: Disallowed the surrogatepass error handler for non UTF-\*
36238 - bpo-20998: Fixed re.fullmatch() of repeated single character pattern with
36241 - bpo-21075: fileinput.FileInput now reads bytes from standard stream if
36242   binary mode is specified.  Patch by Sam Kimbrel.
36244 - bpo-19775: Add a samefile() method to pathlib Path objects.  Initial patch
36247 - bpo-21226: Set up modules properly in PyImport_ExecCodeModuleObject (and
36250 - bpo-21398: Fix a unicode error in the pydoc pager when the documentation
36253 - bpo-16531: ipaddress.IPv4Network and ipaddress.IPv6Network now accept an
36257 - bpo-21156: importlib.abc.InspectLoader.source_to_code() is now a
36260 - bpo-21424: Simplified and optimized heaqp.nlargest() and nmsmallest() to
36263 - bpo-21396: Fix TextIOWrapper(..., write_through=True) to not force a
36266 - bpo-18314: Unlink now removes junctions on Windows. Patch by Kim Gräsman
36268 - bpo-21088: Bugfix for curses.window.addch() regression in 3.4.0. In
36271 - bpo-21407: _decimal: The module now supports function signatures.
36273 - bpo-10650: Remove the non-standard 'watchexp' parameter from the
36277 - bpo-21469: Reduced the risk of false positives in robotparser by checking
36281 - bpo-19414: Have the OrderedDict mark deleted links as unusable. This gives
36282   an early failure if the link is deleted during iteration.
36284 - bpo-21421: Add __slots__ to the MappingViews ABC. Patch by Josh Rosenberg.
36286 - bpo-21101: Eliminate double hashing in the C speed-up code for
36289 - bpo-21321: itertools.islice() now releases the reference to the source
36290   iterator when the slice is exhausted.  Patch by Anton Afanasyev.
36292 - bpo-21057: TextIOWrapper now allows the underlying binary stream's read()
36293   or read1() method to return an arbitrary bytes-like object (such as a
36296 - bpo-20951: SSLSocket.send() now raises either SSLWantReadError or
36297   SSLWantWriteError on a non-blocking socket if the operation would block.
36300 - bpo-13248: removed previously deprecated asyncore.dispatcher __getattr__
36303 - bpo-9815: assertRaises now tries to clear references to local variables in
36306 - bpo-19940: ssl.cert_time_to_seconds() now interprets the given time string
36309 - bpo-13204: Calling sys.flags.__new__ would crash the interpreter, now it
36312 - bpo-19385: Make operations on a closed dbm.dumb database always raise the
36315 - bpo-21207: Detect when the os.urandom cached fd has been closed or
36318 - bpo-21291: subprocess's Popen.wait() is now thread safe so that multiple
36322 - bpo-21127: Path objects can now be instantiated from str subclass
36325 - bpo-15002: urllib.response object to use _TemporaryFileWrapper (and
36329 - bpo-12220: mindom now raises a custom ValueError indicating it doesn't
36332 - bpo-21068: The ssl.PROTOCOL* constants are now enum members.
36334 - bpo-21276: posixmodule: Don't define USE_XATTRS on KFreeBSD and the Hurd.
36336 - bpo-21262: New method assert_not_called for Mock. It raises AssertionError
36339 - bpo-21238: New keyword argument `unsafe` to Mock. It raises
36342 - bpo-20896: ssl.get_server_certificate() now uses PROTOCOL_SSLv23, not
36345 - bpo-21239: patch.stopall() didn't work deterministically when the same
36348 - bpo-21203: Updated fileConfig and dictConfig to remove inconsistencies.
36351 - bpo-21222: Passing name keyword argument to mock.create_autospec now
36354 - bpo-21197: Add lib64 -> lib symlink in venvs on 64-bit non-OS X POSIX.
36356 - bpo-17498: Some SMTP servers disconnect after certain errors, violating
36359   the SMTPServerDisconnected error until the next command is issued.
36361 - bpo-17826: setting an iterable side_effect on a mock function created by
36364 - bpo-7776: Fix ``Host:`` header and reconnection when using
36367 - bpo-20968: unittest.mock.MagicMock now supports division. Patch by
36370 - bpo-21529: Fix arbitrary memory access in JSONDecoder.raw_decode with a
36371   negative second parameter. Bug reported by Guido Vranken. (See also:
36372   CVE-2014-4616)
36374 - bpo-21169: getpass now handles non-ascii characters that the input stream
36375   encoding cannot encode by re-encoding using the replace error handler.
36377 - bpo-21171: Fixed undocumented filter API of the rot13 codec. Patch by
36380 - bpo-20539: Improved math.factorial error message for large positive inputs
36381   and changed exception type (OverflowError -> ValueError) for large
36384 - bpo-21172: isinstance check relaxed from dict to collections.Mapping.
36386 - bpo-21155: asyncio.EventLoop.create_unix_server() now raises a ValueError
36389 - bpo-21136: Avoid unnecessary normalization of Fractions resulting from
36392 - bpo-17621: Introduce importlib.util.LazyLoader.
36394 - bpo-21076: signal module constants were turned into enums. Patch by
36397 - bpo-20636: Improved the repr of Tkinter widgets.
36399 - bpo-19505: The items, keys, and values views of OrderedDict now support
36402 - bpo-21149: Improved thread-safety in logging cleanup during interpreter
36405 - bpo-21058: Fix a leak of file descriptor in
36409 - bpo-21200: Return None from pkgutil.get_loader() when __spec__ is missing.
36411 - bpo-21013: Enhance ssl.create_default_context() when used for server side
36414 - bpo-20145: `assertRaisesRegex` and `assertWarnsRegex` now raise a
36415   TypeError if the second argument is not a string or compiled regex.
36417 - bpo-20633: Replace relative import by absolute import.
36419 - bpo-20980: Stop wrapping exception when using ThreadPool.
36421 - bpo-21082: In os.makedirs, do not set the process-wide umask. Note this
36424 - bpo-20990: Fix issues found by pyflakes for multiprocessing.
36426 - bpo-21015: SSL contexts will now automatically select an elliptic curve
36430 - bpo-21000: Improve the command-line interface of json.tool.
36432 - bpo-20995: Enhance default ciphers used by the ssl module to enable better
36435 - bpo-20884: Don't assume that __file__ is defined on importlib.__init__.
36437 - bpo-21499: Ignore __builtins__ in several test_importlib.test_api tests.
36439 - bpo-20627: xmlrpc.client.ServerProxy is now a context manager.
36441 - bpo-19165: The formatter module now raises DeprecationWarning instead of
36444 - bpo-13936: Remove the ability of datetime.time instances to be considered
36447 - bpo-18931: selectors module now supports /dev/poll on Solaris. Patch by
36450 - bpo-19977: When the ``LC_TYPE`` locale is the POSIX locale (``C`` locale),
36455 - bpo-20574: Implement incremental decoder for cp65001 code (Windows code
36456   page 65001, Microsoft UTF-8).
36458 - bpo-20879: Delay the initialization of encoding and decoding tables for
36463 - bpo-19157: Include the broadcast address in the usuable hosts for IPv6 in
36466 - bpo-11599: When an external command (e.g. compiler) fails, distutils now
36468   the environment variable DISTUTILS_DEBUG is set.
36470 - bpo-4931: distutils should not produce unhelpful "error: None" messages
36471   anymore. distutils.util.grok_environment_error is kept but doc-deprecated.
36473 - bpo-20875: Prevent possible gzip "'read' is not defined" NameError. Patch
36476 - bpo-11558: ``email.message.Message.attach`` now returns a more useful
36477   error message if ``attach`` is called on a message for which
36478   ``is_multipart`` is False.
36480 - bpo-20283: RE pattern methods now accept the string keyword parameters as
36484 - bpo-20778: Fix modulefinder to work with bytecode-only modules.
36486 - bpo-20791: copy.copy() now doesn't make a copy when the input is a bytes
36489 - bpo-19748: On AIX, time.mktime() now raises an OverflowError for year
36492 - bpo-19573: inspect.signature: Use enum for parameter kind constants.
36494 - bpo-20726: inspect.signature: Make Signature and Parameter picklable.
36496 - bpo-17373: Add inspect.Signature.from_callable method.
36498 - bpo-20378: Improve repr of inspect.Signature and inspect.Parameter.
36500 - bpo-20816: Fix inspect.getcallargs() to raise correct TypeError for
36501   missing keyword-only arguments. Patch by Jeremiah Lowin.
36503 - bpo-20817: Fix inspect.getcallargs() to fail correctly if more than 3
36506 - bpo-6676: Ensure a meaningful exception is raised when attempting to parse
36511 - bpo-21117: Fix inspect.signature to better support functools.partial. Due
36513   positional-or-keyword arguments passed as keyword arguments become
36514   keyword-only.
36516 - bpo-20334: inspect.Signature and inspect.Parameter are now hashable.
36519 - bpo-15916: doctest.DocTestSuite returns an empty unittest.TestSuite
36522 - bpo-21209: Fix asyncio.tasks.CoroWrapper to workaround a bug in yield-from
36525 - asyncio: Add gi_{frame,running,code} properties to CoroWrapper (upstream
36528 - bpo-21311: Avoid exception in _osx_support with non-standard compiler
36531 - bpo-11571: Ensure that the turtle window becomes the topmost window when
36534 - bpo-21801: Validate that __signature__ is None or an instance of
36537 - bpo-21923: Prevent AttributeError in
36541 - bpo-21323: Fix http.server to again handle scripts in CGI subdirectories,
36544 - bpo-22733: Fix ffi_prep_args not zero-extending argument values correctly
36545   on 64-bit Windows.
36547 - bpo-23302: Default to TCP_NODELAY=1 upon establishing an HTTPConnection.
36548   Removed use of hard-coded MSS as it's an optimization that's no longer
36552 ----
36554 - bpo-20577: Configuration of the max line length for the FormatParagraph
36559 - bpo-16893: Update Idle doc chapter to match current Idle and add new
36562 - bpo-3068: Add Idle extension configuration dialog to Options menu. Changes
36563   are written to HOME/.idlerc/config-extensions.cfg. Original patch by Tal
36566 - bpo-16233: A module browser (File : Class Browser, Alt+C) requires an
36567   editor window with a filename.  When Class Browser is requested otherwise,
36570   is entered and a module is opened, a corresponding browser is also opened.
36572 - bpo-4832: Save As to type Python files automatically adds .py to the name
36574   automatically add .txt when type is Text files.
36576 - bpo-21986: Code objects are not normally pickled by the pickle module. To
36579 - bpo-17390: Adjust Editor window title; remove 'Python', move version to
36582 - bpo-14105: Idle debugger breakpoints no longer disappear when inserting or
36585 - bpo-17172: Turtledemo can now be run from Idle. Currently, the entry is on
36589 - bpo-21765: Add support for non-ascii identifiers to HyperParser.
36591 - bpo-21940: Add unittest for WidgetRedirector. Initial patch by Saimadhav
36594 - bpo-18592: Add unittest for SearchDialogBase. Patch by Phil Webster.
36596 - bpo-21694: Add unittest for ParenMatch. Patch by Saimadhav Heblikar.
36598 - bpo-21686: add unittest for HyperParser. Original patch by Saimadhav
36601 - bpo-12387: Add missing upper(lower)case versions of default Windows key
36605 - bpo-21695: Closing a Find-in-files output window while the search is still
36608 - bpo-18910: Add unittest for textView. Patch by Phil Webster.
36610 - bpo-18292: Add unittest for AutoExpand. Patch by Saihadhav Heblikar.
36612 - bpo-18409: Add unittest for AutoComplete. Patch by Phil Webster.
36614 - bpo-21477: htest.py - Improve framework, complete set of tests. Patches by
36617 - bpo-18104: Add idlelib/idle_test/htest.py with a few sample tests to begin
36618   consolidating and improving human-validated tests of Idle. Change other
36622 - bpo-21139: Change default paragraph width to 72, the :pep:`8`
36625 - bpo-21284: Paragraph reformat test passes after user changes reformat
36628 - bpo-17654: Ensure IDLE menus are customized properly on OS X for
36629   non-framework builds and for all variants of Tk.
36631 - bpo-23180: Rename IDLE "Windows" menu item to "Window". Patch by Al
36635 -----
36637 - bpo-15506: Use standard PKG_PROG_PKG_CONFIG autoconf macro in the
36640 - bpo-22935: Allow the ssl module to be compiled if openssl doesn't support
36643 - bpo-22592: Drop support of the Borland C compiler to build Python. The
36646 - bpo-22591: Drop support of MS-DOS, especially of the DJGPP compiler
36647   (MS-DOS port of GCC).
36649 - bpo-16537: Check whether self.extensions is empty in setup.py. Patch by
36652 - bpo-22359: Remove incorrect uses of recursive make.  Patch by Jonas
36655 - bpo-21958: Define HAVE_ROUND when building with Visual Studio 2013 and
36658 - bpo-18093: the programs that embed the CPython runtime are now in a
36662 - bpo-15759: "make suspicious", "make linkcheck" and "make doctest" in Doc/
36665 - bpo-21141: The Windows build process no longer attempts to find Perl,
36667   The ``PCbuild\build_ssl.py`` script has been re-written and re-named to
36670   svn.python.org will always be pre-configured and ready to build.
36672 - bpo-21037: Add a build option to enable AddressSanitizer support.
36674 - bpo-19962: The Windows build process now creates "python.bat" in the root
36678 - bpo-21285: Refactor and fix curses configure check to always search in a
36681 - bpo-15234: For BerkeleyDB and Sqlite, only add the found library and
36685 - bpo-17861: Tools/scripts/generate_opcode_h.py automatically regenerates
36688 - bpo-20644: OS X installer build support for documentation build changes in
36689   3.4.1: assume externally supplied sphinx-build is available in /usr/bin.
36691 - bpo-20022: Eliminate use of deprecated bundlebuilder in OS X builds.
36693 - bpo-15968: Incorporated Tcl, Tk, and Tix builds into the Windows build
36696 - bpo-17095: Fix Modules/Setup *shared* support.
36698 - bpo-21811: Anticipated fixes to support OS X versions > 10.9.
36700 - bpo-21166: Prevent possible segfaults and other random failures of python
36701   --generate-posix-vars in pybuilddir.txt build target.
36703 - bpo-18096: Fix library order returned by python-config.
36705 - bpo-17219: Add library build dir for Python extension cross-builds.
36707 - bpo-22919: Windows build updated to support VC 14.0 (Visual Studio 2015),
36710 - bpo-21236: Build _msi.pyd with cabinet.lib instead of fci.lib
36712 - bpo-17128: Use private version of OpenSSL for OS X 10.5+ installer.
36715 -----
36717 - bpo-14203: Remove obsolete support for view==NULL in PyBuffer_FillInfo(),
36721 - bpo-22445: PyBuffer_IsContiguous() now implements precise contiguity
36725 - bpo-22079: PyType_Ready() now checks that statically allocated type has no
36728 - bpo-22453: Removed non-documented macro PyObject_REPR().
36730 - bpo-18395: Rename ``_Py_char2wchar()`` to :c:func:`Py_DecodeLocale`,
36734 - bpo-21233: Add new C functions: PyMem_RawCalloc(), PyMem_Calloc(),
36735   PyObject_Calloc(), _PyObject_GC_Calloc(). bytes(int) is now using
36736   ``calloc()`` instead of ``malloc()`` for large objects which is faster and
36739 - bpo-20942: PyImport_ImportFrozenModuleObject() no longer sets __file__ to
36744 -------------
36746 - bpo-19548: Update the codecs module documentation to better cover the
36750 - bpo-22394: Doc/Makefile now supports ``make venv PYTHON=../python`` to
36754 - bpo-21514: The documentation of the json module now refers to new JSON RFC
36757 - bpo-21777: The binary sequence methods on bytes and bytearray are now
36762 - bpo-6916: undocument deprecated asynchat.fifo class.
36764 - bpo-17386: Expanded functionality of the ``Doc/make.bat`` script to make
36767 - bpo-21312: Update the thread_foobar.h template file to include newer
36770 - bpo-21043: Remove the recommendation for specific CA organizations and to
36773 - bpo-20765: Add missing documentation for PurePath.with_name() and
36776 - bpo-19407: New package installation and distribution guides based on the
36781 - bpo-19697: Document cases where __main__.__spec__ is None.
36784 -----
36786 - bpo-18982: Add tests for CLI of the calendar module.
36788 - bpo-19548: Added some additional checks to test_codecs to ensure that
36792 - bpo-22838: All test_re tests now work with unittest test discovery.
36794 - bpo-22173: Update lib2to3 tests to use unittest test discovery.
36796 - bpo-16000: Convert test_curses to use unittest.
36798 - bpo-21456: Skip two tests in test_urllib2net.py if _ssl module not
36801 - bpo-20746: Fix test_pdb to run in refleak mode (-R).  Patch by Xavier de
36804 - bpo-22060: test_ctypes has been somewhat cleaned up and simplified; it now
36807 - bpo-22104: regrtest.py no longer holds a reference to the suite of tests
36810 - bpo-22111: Assorted cleanups in test_imaplib.  Patch by Milan Oberkirch.
36812 - bpo-22002: Added ``load_package_tests`` function to test.support and used
36816 - bpo-21976: Fix test_ssl to accept LibreSSL version strings.  Thanks to
36819 - bpo-21918: Converted test_tools from a module to a package containing
36822 - bpo-9554: Use modern unittest features in test_argparse. Initial patch by
36825 - bpo-20155: Changed HTTP method names in failing tests in test_httpservers
36830 - bpo-19493: Refactored the ctypes test package to skip tests explicitly
36833 - bpo-18492: All resources are now allowed when tests are not run by
36836 - bpo-21634: Fix pystone micro-benchmark: use floor division instead of true
36840 - bpo-21605: Added tests for Tkinter images.
36842 - bpo-21493: Added test for ntpath.expanduser().  Original patch by Claudiu
36845 - bpo-19925: Added tests for the spwd module. Original patch by Vajrasky
36848 - bpo-21522: Added Tkinter tests for Listbox.itemconfigure(),
36851 - bpo-17756: Fix test_code test when run from the installed location.
36853 - bpo-17752: Fix distutils tests when run from the installed location.
36855 - bpo-18604: Consolidated checks for GUI availability.  All platforms now at
36856   least check whether Tk can be instantiated when the GUI resource is
36859 - bpo-21275: Fix a socket test on KFreeBSD.
36861 - bpo-21223: Pass test_site/test_startup_imports when some of the extensions
36864 - bpo-20635: Added tests for Tk geometry managers.
36866 - Add test case for freeze.
36868 - bpo-20743: Fix a reference leak in test_tcl.
36870 - bpo-21097: Move test_namespace_pkgs into test_importlib.
36872 - bpo-21503: Use test_both() consistently in test_importlib.
36874 - bpo-20939: Avoid various network test failures due to new redirect of
36878 - bpo-20668: asyncio tests no longer rely on tests.txt file. (Patch by
36881 - bpo-21093: Prevent failures of ctypes test_macholib on OS X if a copy of
36884 - bpo-22770: Prevent some Tk segfaults on OS X when running gui tests.
36886 - bpo-23211: Workaround test_logging failure on some OS X 10.6 systems.
36888 - bpo-23345: Prevent test_ssl failures with large OpenSSL patch level values
36892 -----------
36894 - bpo-22314: pydoc now works when the LINES environment variable is set.
36896 - bpo-22615: Argument Clinic now supports the "type" argument for the int
36899 - bpo-20076: The makelocalealias.py script no longer ignores UTF-8 mapping.
36901 - bpo-20079: The makelocalealias.py script now can parse the SUPPORTED file
36904 - bpo-22201: Command-line interface of the zipfile module now correctly
36907 - bpo-22120: For functions using an unsigned integer return converter,
36908   Argument Clinic now generates a cast to that type for the comparison to -1
36911 - bpo-18974: Tools/scripts/diff.py now uses argparse instead of optparse.
36913 - bpo-21906: Make Tools/scripts/md5sum.py work in Python 3. Patch by Zachary
36916 - bpo-21629: Fix Argument Clinic's "--converters" feature.
36918 - Add support for ``yield from`` to 2to3.
36920 - Add support for the :pep:`465` matrix multiplication operator to 2to3.
36922 - bpo-16047: Fix module exception list and __file__ handling in freeze.
36925 - bpo-11824: Consider ABI tags in freeze. Patch by Meador Inge.
36927 - bpo-20535: PYTHONWARNING no longer affects the run_tests.py script. Patch
36931 -------
36933 - bpo-23260: Update Windows installer
36935 - The bundled version of Tcl/Tk has been updated to 8.6.3.  The most visible
36936   result of this change is the addition of new native file dialogs when
36941 - bpo-17896: The Windows build scripts now expect external library sources
36944 - bpo-17717: The Windows build scripts now use a copy of NASM pulled from
36947 - bpo-21907: Improved the batch scripts provided for building Python.
36949 - bpo-22644: The bundled version of OpenSSL has been updated to 1.0.1j.
36951 - bpo-10747: Use versioned labels in the Windows start menu. Patch by Olive
36954 - bpo-22980: .pyd files with a version and platform tag (for example,
36955   ".cp35-win32.pyd") will now be loaded in preference to those without tags.