"""The io module provides the Python interfaces to stream handling. The

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builtin open function is defined in this module.

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At the top of the I/O hierarchy is the abstract base class IOBase. It

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defines the basic interface to a stream. Note, however, that there is no

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separation between reading and writing to streams; implementations are

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allowed to raise an IOError if they do not support a given operation.

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Extending IOBase is RawIOBase which deals simply with the reading and

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writing of raw bytes to a stream. FileIO subclasses RawIOBase to provide

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an interface to OS files.

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BufferedIOBase deals with buffering on a raw byte stream (RawIOBase). Its

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subclasses, BufferedWriter, BufferedReader, and BufferedRWPair buffer

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streams that are readable, writable, and both respectively.

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BufferedRandom provides a buffered interface to random access

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streams. BytesIO is a simple stream of in-memory bytes.

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Another IOBase subclass, TextIOBase, deals with the encoding and decoding

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of streams into text. TextIOWrapper, which extends it, is a buffered text

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interface to a buffered raw stream (`BufferedIOBase`). Finally, StringIO

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is an in-memory stream for text.

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Argument names are not part of the specification, and only the arguments

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of open() are intended to be used as keyword arguments.

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data:

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DEFAULT_BUFFER_SIZE

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An int containing the default buffer size used by the module's buffered

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I/O classes. open() uses the file's blksize (as obtained by os.stat) if

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possible.

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"""

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# New I/O library conforming to PEP 3116.

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__author__ = ("Guido van Rossum <guido@python.org>, "

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"Mike Verdone <mike.verdone@gmail.com>, "

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"Mark Russell <mark.russell@zen.co.uk>, "

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"Antoine Pitrou <solipsis@pitrou.net>, "

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"Amaury Forgeot d'Arc <amauryfa@gmail.com>, "

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"Benjamin Peterson <benjamin@python.org>")

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__all__ = ["BlockingIOError", "open", "IOBase", "RawIOBase", "FileIO",

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"BytesIO", "StringIO", "BufferedIOBase",

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"BufferedReader", "BufferedWriter", "BufferedRWPair",

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"BufferedRandom", "TextIOBase", "TextIOWrapper",

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"UnsupportedOperation", "SEEK_SET", "SEEK_CUR", "SEEK_END"]

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import _io

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import abc

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from _io import (DEFAULT_BUFFER_SIZE, BlockingIOError, UnsupportedOperation,

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open, FileIO, BytesIO, StringIO, BufferedReader,

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BufferedWriter, BufferedRWPair, BufferedRandom,

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IncrementalNewlineDecoder, TextIOWrapper)

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OpenWrapper = _io.open # for compatibility with _pyio

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# for seek()

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SEEK_SET = 0

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SEEK_CUR = 1

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SEEK_END = 2

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# Declaring ABCs in C is tricky so we do it here.

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# Method descriptions and default implementations are inherited from the C

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# version however.

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class IOBase(_io._IOBase):

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__metaclass__ = abc.ABCMeta

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__doc__ = _io._IOBase.__doc__

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class RawIOBase(_io._RawIOBase, IOBase):

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__doc__ = _io._RawIOBase.__doc__

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class BufferedIOBase(_io._BufferedIOBase, IOBase):

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__doc__ = _io._BufferedIOBase.__doc__

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class TextIOBase(_io._TextIOBase, IOBase):

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__doc__ = _io._TextIOBase.__doc__

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RawIOBase.register(FileIO)

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for klass in (BytesIO, BufferedReader, BufferedWriter, BufferedRandom,

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BufferedRWPair):

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BufferedIOBase.register(klass)

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for klass in (StringIO, TextIOWrapper):

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TextIOBase.register(klass)

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del klass

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