Misc/NEWS.d/2.7a3.rst

.. bpo: 5677
.. date: 7847
.. nonce: b0Qejz
.. release date: 2010-02-06
.. section: Core and Builtins

Explicitly forbid write operations on read-only file objects, and read
operations on write-only file objects.  On Windows, the system C library
would return a bogus result; on Solaris, it was possible to crash the
interpreter.  Patch by Stefan Krah.

..

.. bpo: 7853
.. date: 7846
.. nonce: 7BnJKC
.. section: Core and Builtins

Normalize exceptions before they are passed to a context manager's
``__exit__()`` method.

..

.. bpo: 7385
.. date: 7845
.. nonce: OVCbWd
.. section: Core and Builtins

Fix a crash in ``PyMemoryView_FromObject()`` when ``PyObject_GetBuffer()``
fails.  Patch by Florent Xicluna.

..

.. bpo: 7819
.. date: 7844
.. nonce: tGsOrJ
.. section: Core and Builtins

Check ``sys.call_tracing()`` arguments types.

..

.. bpo: 7788
.. date: 7843
.. nonce: 4T4M13
.. section: Core and Builtins

Fix an interpreter crash produced by deleting a list slice with very large
step value.

..

.. bpo: 7766
.. date: 7842
.. nonce: aejr9M
.. section: Core and Builtins

Change ``sys.getwindowsversion()`` return value to a named tuple and add the
additional members returned in an OSVERSIONINFOEX structure.  The new
members are service_pack_major, service_pack_minor, suite_mask, and
product_type.

..

.. bpo: 7561
.. date: 7841
.. nonce: dYmand
.. section: Core and Builtins

Operations on empty bytearrays (such as ``int(bytearray())``) could crash in
many places because of the ``PyByteArray_AS_STRING()`` macro returning NULL.
The macro now returns a statically allocated empty string instead.

..

.. bpo: 7622
.. date: 7840
.. nonce: yL5cXb
.. section: Core and Builtins

Improve the split(), rsplit(), splitlines() and replace() methods of bytes,
bytearray and unicode objects by using a common implementation based on
stringlib's fast search.  Patch by Florent Xicluna.

..

.. bpo: 7632
.. date: 7839
.. nonce: djAkIG
.. section: Core and Builtins

Fix various str -> float conversion bugs present in 2.7 alpha 2, including:

(1) a serious 'wrong output' bug that could occur for long (> 40 digit)
input     strings, (2) a crash in dtoa.c that occurred in debug builds when
parsing certain long     numeric strings corresponding to subnormal values,
(3) a memory leak for some values large enough to cause overflow, and (4) a
number of flaws that could lead to incorrectly rounded results.

..

.. bpo: 7319
.. date: 7838
.. nonce: CIP64d
.. section: Core and Builtins

Silence ``DeprecationWarning`` by default when the -3 option is not used.
(See also: bpo-7770)

..

.. bpo: 2335
.. date: 7837
.. nonce: NB-Xpf
.. section: Core and Builtins

Backport set literals syntax from Python 3.x.

..

.. bpo: 2333
.. date: 7836
.. nonce: yWLBy3
.. section: Core and Builtins

Backport set and dict comprehensions syntax from Python 3.x.

..

.. bpo: 1967
.. date: 7835
.. nonce: RryGx3
.. section: Core and Builtins

Backport dictionary views from Python 3.x.

..

.. bpo: 9137
.. date: 7834
.. nonce: DgWODo
.. section: Library

Fix issue in MutableMapping.update, which incorrectly treated keyword
arguments called 'self' or 'other' specially.

..

.. bpo: 7835
.. date: 7833
.. nonce: jlbrK8
.. section: Library

shelve should no longer produce mysterious warnings during interpreter
shutdown.

..

.. bpo: 2746
.. date: 7832
.. nonce: F6UqCX
.. section: Library

Don't escape ampersands and angle brackets ("&", "<", ">") in XML processing
instructions and comments.  These raw characters are allowed by the XML
specification, and are necessary when outputting e.g.  PHP code in a
processing instruction.  Patch by Neil Muller.

..

.. bpo: 7869
.. date: 7831
.. nonce: 1QS851
.. section: Library

logging: Improved diagnostic for format-time errors.

..

.. bpo: 7868
.. date: 7830
.. nonce: PXTr9t
.. section: Library

logging: Added loggerClass attribute to Manager.

..

.. bpo: 7851
.. date: 7829
.. nonce: 7OtUnx
.. section: Library

logging: Clarification on logging configuration files.

..

.. bpo: 4772
.. date: 7828
.. nonce: 9_Y3av
.. section: Library

Raise a ValueError when an unknown Bluetooth protocol is specified, rather
than fall through to AF_PACKET (in the ``socket`` module). Also, raise
ValueError rather than TypeError when an unknown TIPC address type is
specified.  Patch by Brian Curtin.

..

.. bpo: 0
.. date: 7827
.. nonce: DG4Srd
.. section: Library

logging: Implemented PEP 391.

..

.. bpo: 6939
.. date: 7826
.. nonce: 8fBhhK
.. section: Library

Fix file I/O objects in the `io` module to keep the original file position
when calling `truncate()`.  It would previously change the file position to
the given argument, which goes against the tradition of ftruncate() and
other truncation APIs.  Patch by Pascal Chambon.

..

.. bpo: 7610
.. date: 7825
.. nonce: 2DXmYZ
.. section: Library

Reworked implementation of the internal ``zipfile.ZipExtFile`` class used to
represent files stored inside an archive.  The new implementation is
significantly faster and can be wrapped in an ``io.BufferedReader`` object
for more speedups.  It also solves an issue where interleaved calls to
``read()`` and ``readline()`` give wrong results. Patch by Nir Aides.

..

.. bpo: 7792
.. date: 7824
.. nonce: ncH8BS
.. section: Library

Registering non-classes to ABCs raised an obscure error.

..

.. bpo: 0
.. date: 7823
.. nonce: RpNACh
.. section: Library

Removed the deprecated functions ``verify()`` and ``vereq()`` from
Lib/test/test_support.py.

..

.. bpo: 7773
.. date: 7822
.. nonce: x2tWld
.. section: Library

Fix an UnboundLocalError in ``platform.linux_distribution()`` when the
release file is empty.

..

.. bpo: 7748
.. date: 7821
.. nonce: YlAgV-
.. section: Library

Since unicode values are supported for some metadata options in Distutils,
the DistributionMetadata get_* methods will now return a utf-8 encoded
string for them.  This ensures that the upload and register commands send
the correct values to PyPI without any error.

..

.. bpo: 1670765
.. date: 7820
.. nonce: 9eCqJl
.. section: Library

Prevent ``email.generator.Generator`` from re-wrapping headers in
multipart/signed MIME parts, which fixes one of the sources of invalid
modifications to such parts by Generator.

..

.. bpo: 7701
.. date: 7819
.. nonce: e9a5VO
.. section: Library

Fix crash in ``binascii.b2a_uu()`` in debug mode when given a 1-byte
argument.  Patch by Victor Stinner.

..

.. bpo: 3299
.. date: 7818
.. nonce: AzzK85
.. section: Library

Fix possible crash in the _sre module when given bad argument values in
debug mode.  Patch by Victor Stinner.

..

.. bpo: 7703
.. date: 7817
.. nonce: FNoqUO
.. section: Library

Add support for the new buffer API to functions of the binascii module.
Backported from py3k by Florent Xicluna, with some additional tests.

..

.. bpo: 2846
.. date: 7816
.. nonce: 1yXo1U
.. section: Library

Add support for gzip.GzipFile reading zero-padded files.  Patch by Brian
Curtin.

..

.. bpo: 5827
.. date: 7815
.. nonce: HqdXuX
.. section: Library

Make sure that normpath preserves unicode.  Initial patch by Matt Giuca.

..

.. bpo: 5372
.. date: 7814
.. nonce: t3pYj8
.. section: Library

Drop the reuse of .o files in Distutils' ccompiler (since Extension extra
options may change the output without changing the .c file). Initial patch
by Collin Winter.

..

.. bpo: 0
.. date: 7813
.. nonce: nL49In
.. section: Library

Expat: Fix DoS via XML document with malformed UTF-8 sequences
(CVE_2009_3560).

..

.. bpo: 7632
.. date: 7812
.. nonce: AWDxJU
.. section: Build

When Py_USING_MEMORY_DEBUGGER is defined, disable the private memory
allocation scheme in dtoa.c and use PyMem_Malloc and PyMem_Free instead.
Also disable caching of powers of 5.

..

.. bpo: 7658
.. date: 7811
.. nonce: oUBbSZ
.. section: Build

Ensure that the new pythonw executable works on OSX 10.4

..

.. bpo: 7714
.. date: 7810
.. nonce: 27wQ2M
.. section: Build

Use ``gcc -dumpversion`` to detect the version of GCC on MacOSX.

..

.. bpo: 7661
.. date: 7809
.. nonce: ggMDHr
.. section: Build

Allow ctypes to be built from a non-ASCII directory path. Patch by Florent
Xicluna.

..

.. bpo: 0
.. date: 7808
.. nonce: KgUrLn
.. section: Tools/Demos

iobench (a file I/O benchmark) and ccbench (a concurrency benchmark) were
added to the ``Tools`` directory.  They were previously living in the
sandbox.

..

.. bpo: 7728
.. date: 7807
.. nonce: f9wo4c
.. section: Tests

test_timeout was changed to use ``test_support.bind_port()`` instead of a
hard coded port.

..

.. bpo: 0
.. date: 7806
.. nonce: Dx9g36
.. section: Documentation

Updated "Using Python" documentation to include description of CPython's -J,
-U and -X options.

..

.. bpo: 0
.. date: 7805
.. nonce: vllYdR
.. section: Documentation

Updated Python manual page (options -B, -O0, -s, environment variables
PYTHONDONTWRITEBYTECODE, PYTHONNOUSERSITE).