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+"""The io module provides the Python interfaces to stream handling. The
+builtin open function is defined in this module.
+
+At the top of the I/O hierarchy is the abstract base class IOBase. It
+defines the basic interface to a stream. Note, however, that there is no
+separation between reading and writing to streams; implementations are
+allowed to raise an IOError if they do not support a given operation.
+
+Extending IOBase is RawIOBase which deals simply with the reading and
+writing of raw bytes to a stream. FileIO subclasses RawIOBase to provide
+an interface to OS files.
+
+BufferedIOBase deals with buffering on a raw byte stream (RawIOBase). Its
+subclasses, BufferedWriter, BufferedReader, and BufferedRWPair buffer
+streams that are readable, writable, and both respectively.
+BufferedRandom provides a buffered interface to random access
+streams. BytesIO is a simple stream of in-memory bytes.
+
+Another IOBase subclass, TextIOBase, deals with the encoding and decoding
+of streams into text. TextIOWrapper, which extends it, is a buffered text
+interface to a buffered raw stream (`BufferedIOBase`). Finally, StringIO
+is an in-memory stream for text.
+
+Argument names are not part of the specification, and only the arguments
+of 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", "IOBase", "RawIOBase", "FileIO",
+           "BytesIO", "StringIO", "BufferedIOBase",
+           "BufferedReader", "BufferedWriter", "BufferedRWPair",
+           "BufferedRandom", "TextIOBase", "TextIOWrapper",
+           "UnsupportedOperation", "SEEK_SET", "SEEK_CUR", "SEEK_END"]
+
+
+import _io
+import abc
+
+from _io import (DEFAULT_BUFFER_SIZE, BlockingIOError, UnsupportedOperation,
+                 open, FileIO, BytesIO, StringIO, BufferedReader,
+                 BufferedWriter, BufferedRWPair, BufferedRandom,
+                 IncrementalNewlineDecoder, TextIOWrapper)
+
+OpenWrapper = _io.open # for compatibility with _pyio
+
+# for seek()
+SEEK_SET = 0
+SEEK_CUR = 1
+SEEK_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