| Current File : //lib64/python2.7/io.py |
"""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 a 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 <[email protected]>, "
"Mike Verdone <[email protected]>, "
"Mark Russell <[email protected]>, "
"Antoine Pitrou <[email protected]>, "
"Amaury Forgeot d'Arc <[email protected]>, "
"Benjamin Peterson <[email protected]>")
__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
class RawIOBase(_io._RawIOBase, IOBase):
pass
class BufferedIOBase(_io._BufferedIOBase, IOBase):
pass
class TextIOBase(_io._TextIOBase, IOBase):
pass
RawIOBase.register(FileIO)
for klass in (BytesIO, BufferedReader, BufferedWriter, BufferedRandom,
BufferedRWPair):
BufferedIOBase.register(klass)
for klass in (StringIO, TextIOWrapper):
TextIOBase.register(klass)
del klass