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io.py3.5 KB · 100 lines
"""The io module provides the Python interfaces to stream handling. Thebuiltin open function is defined in this module. At the top of the I/O hierarchy is the abstract base class IOBase. Itdefines the basic interface to a stream. Note, however, that there is noseparation between reading and writing to streams; implementations areallowed to raise an OSError if they do not support a given operation. Extending IOBase is RawIOBase which deals simply with the reading andwriting of raw bytes to a stream. FileIO subclasses RawIOBase to providean interface to OS files. BufferedIOBase deals with buffering on a raw byte stream (RawIOBase). Itssubclasses, BufferedWriter, BufferedReader, and BufferedRWPair bufferstreams that are readable, writable, and both respectively.BufferedRandom provides a buffered interface to random accessstreams. BytesIO is a simple stream of in-memory bytes. Another IOBase subclass, TextIOBase, deals with the encoding and decodingof streams into text. TextIOWrapper, which extends it, is a buffered textinterface to a buffered raw stream (`BufferedIOBase`). Finally, StringIOis an in-memory stream for text. Argument names are not part of the specification, and only the argumentsof open() are intended to be used as keyword arguments. data: DEFAULT_BUFFER_SIZE    An int containing the default buffer size used by the module's buffered   I/O classes. open() uses the file's blksize (as obtained by os.stat) if   possible."""# New I/O library conforming to PEP 3116. __author__ = ("Guido van Rossum <guido@python.org>, "              "Mike Verdone <mike.verdone@gmail.com>, "              "Mark Russell <mark.russell@zen.co.uk>, "              "Antoine Pitrou <solipsis@pitrou.net>, "              "Amaury Forgeot d'Arc <amauryfa@gmail.com>, "              "Benjamin Peterson <benjamin@python.org>") __all__ = ["BlockingIOError", "open", "open_code", "IOBase", "RawIOBase",           "FileIO", "BytesIO", "StringIO", "BufferedIOBase",           "BufferedReader", "BufferedWriter", "BufferedRWPair",           "BufferedRandom", "TextIOBase", "TextIOWrapper",           "UnsupportedOperation", "SEEK_SET", "SEEK_CUR", "SEEK_END"]  import _ioimport abc from _io import (DEFAULT_BUFFER_SIZE, BlockingIOError, UnsupportedOperation,                 open, open_code, FileIO, BytesIO, StringIO, BufferedReader,                 BufferedWriter, BufferedRWPair, BufferedRandom,                 IncrementalNewlineDecoder, TextIOWrapper) OpenWrapper = _io.open # for compatibility with _pyio # Pretend this exception was created here.UnsupportedOperation.__module__ = "io" # for seek()SEEK_SET = 0SEEK_CUR = 1SEEK_END = 2 # Declaring ABCs in C is tricky so we do it here.# Method descriptions and default implementations are inherited from the C# version however.class IOBase(_io._IOBase, metaclass=abc.ABCMeta):    __doc__ = _io._IOBase.__doc__ class RawIOBase(_io._RawIOBase, IOBase):    __doc__ = _io._RawIOBase.__doc__ class BufferedIOBase(_io._BufferedIOBase, IOBase):    __doc__ = _io._BufferedIOBase.__doc__ class TextIOBase(_io._TextIOBase, IOBase):    __doc__ = _io._TextIOBase.__doc__ RawIOBase.register(FileIO) for klass in (BytesIO, BufferedReader, BufferedWriter, BufferedRandom,              BufferedRWPair):    BufferedIOBase.register(klass) for klass in (StringIO, TextIOWrapper):    TextIOBase.register(klass)del klass try:    from _io import _WindowsConsoleIOexcept ImportError:    passelse:    RawIOBase.register(_WindowsConsoleIO)