1"""The io module provides the Python interfaces to stream handling. The 2builtin open function is defined in this module. 3 4At the top of the I/O hierarchy is the abstract base class IOBase. It 5defines the basic interface to a stream. Note, however, that there is no 6separation between reading and writing to streams; implementations are 7allowed to raise an IOError if they do not support a given operation. 8 9Extending IOBase is RawIOBase which deals simply with the reading and 10writing of raw bytes to a stream. FileIO subclasses RawIOBase to provide 11an interface to OS files. 12 13BufferedIOBase deals with buffering on a raw byte stream (RawIOBase). Its 14subclasses, BufferedWriter, BufferedReader, and BufferedRWPair buffer 15streams that are readable, writable, and both respectively. 16BufferedRandom provides a buffered interface to random access 17streams. BytesIO is a simple stream of in-memory bytes. 18 19Another IOBase subclass, TextIOBase, deals with the encoding and decoding 20of streams into text. TextIOWrapper, which extends it, is a buffered text 21interface to a buffered raw stream (`BufferedIOBase`). Finally, StringIO 22is an in-memory stream for text. 23 24Argument names are not part of the specification, and only the arguments 25of open() are intended to be used as keyword arguments. 26 27data: 28 29DEFAULT_BUFFER_SIZE 30 31 An int containing the default buffer size used by the module's buffered 32 I/O classes. open() uses the file's blksize (as obtained by os.stat) if 33 possible. 34""" 35# New I/O library conforming to PEP 3116. 36 37__author__ = ("Guido van Rossum <guido@python.org>, " 38 "Mike Verdone <mike.verdone@gmail.com>, " 39 "Mark Russell <mark.russell@zen.co.uk>, " 40 "Antoine Pitrou <solipsis@pitrou.net>, " 41 "Amaury Forgeot d'Arc <amauryfa@gmail.com>, " 42 "Benjamin Peterson <benjamin@python.org>") 43 44__all__ = ["BlockingIOError", "open", "IOBase", "RawIOBase", "FileIO", 45 "BytesIO", "StringIO", "BufferedIOBase", 46 "BufferedReader", "BufferedWriter", "BufferedRWPair", 47 "BufferedRandom", "TextIOBase", "TextIOWrapper", 48 "UnsupportedOperation", "SEEK_SET", "SEEK_CUR", "SEEK_END"] 49 50 51import _io 52import abc 53 54from _io import (DEFAULT_BUFFER_SIZE, BlockingIOError, UnsupportedOperation, 55 open, FileIO, BytesIO, StringIO, BufferedReader, 56 BufferedWriter, BufferedRWPair, BufferedRandom, 57 IncrementalNewlineDecoder, TextIOWrapper) 58 59OpenWrapper = _io.open # for compatibility with _pyio 60 61# for seek() 62SEEK_SET = 0 63SEEK_CUR = 1 64SEEK_END = 2 65 66# Declaring ABCs in C is tricky so we do it here. 67# Method descriptions and default implementations are inherited from the C 68# version however. 69class IOBase(_io._IOBase): 70 __metaclass__ = abc.ABCMeta 71 __doc__ = _io._IOBase.__doc__ 72 73class RawIOBase(_io._RawIOBase, IOBase): 74 __doc__ = _io._RawIOBase.__doc__ 75 76class BufferedIOBase(_io._BufferedIOBase, IOBase): 77 __doc__ = _io._BufferedIOBase.__doc__ 78 79class TextIOBase(_io._TextIOBase, IOBase): 80 __doc__ = _io._TextIOBase.__doc__ 81 82RawIOBase.register(FileIO) 83 84for klass in (BytesIO, BufferedReader, BufferedWriter, BufferedRandom, 85 BufferedRWPair): 86 BufferedIOBase.register(klass) 87 88for klass in (StringIO, TextIOWrapper): 89 TextIOBase.register(klass) 90del klass 91