mirror of
https://github.com/python/cpython.git
synced 2024-11-21 21:09:37 +01:00
100 lines
3.5 KiB
Python
100 lines
3.5 KiB
Python
"""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 OSError 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", "open_code", "IOBase", "RawIOBase",
|
|
"FileIO", "BytesIO", "StringIO", "BufferedIOBase",
|
|
"BufferedReader", "BufferedWriter", "BufferedRWPair",
|
|
"BufferedRandom", "TextIOBase", "TextIOWrapper",
|
|
"UnsupportedOperation", "SEEK_SET", "SEEK_CUR", "SEEK_END",
|
|
"DEFAULT_BUFFER_SIZE", "text_encoding", "IncrementalNewlineDecoder"]
|
|
|
|
|
|
import _io
|
|
import abc
|
|
|
|
from _io import (DEFAULT_BUFFER_SIZE, BlockingIOError, UnsupportedOperation,
|
|
open, open_code, FileIO, BytesIO, StringIO, BufferedReader,
|
|
BufferedWriter, BufferedRWPair, BufferedRandom,
|
|
IncrementalNewlineDecoder, text_encoding, TextIOWrapper)
|
|
|
|
|
|
# Pretend this exception was created here.
|
|
UnsupportedOperation.__module__ = "io"
|
|
|
|
# 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
|
|
|
|
try:
|
|
from _io import _WindowsConsoleIO
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
RawIOBase.register(_WindowsConsoleIO)
|