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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 throw 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.
i( t print_function( t unicode_literalsuq Guido van Rossum <guido@python.org>, Mike Verdone <mike.verdone@gmail.com>, Mark Russell <mark.russell@zen.co.uk>u BlockingIOErroru openu IOBaseu RawIOBaseu FileIOu BytesIOu StringIOu BufferedIOBaseu BufferedReaderu BufferedWriteru BufferedRWPairu BufferedRandomu
TextIOBaseu
TextIOWrapperNi i t BlockingIOErrorc B s e Z d Z d d Z RS( uC Exception raised when I/O would block on a non-blocking I/O stream.i c C s t i | | | | | _ d S( N( t IOErrort __init__t characters_written( t selft errnot strerrorR ( ( s /usr/lib/python2.6/io.pyR L s ( t __name__t
__module__t __doc__R ( ( ( s /usr/lib/python2.6/io.pyR H s u rc C sn t | t t f p t d | n t | t p t d | n | d j o% t | t o t d | n | d j o% t | t o t d | n | d j o% t | t o t d | n t | } | t d p t | t | j o t d | n d | j } d | j } d | j }
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o | St | | | | | } | | _ | S( u Open file and return a stream. If the file cannot be opened, an IOError is
raised.
file is either a string giving the name (and the path if the file
isn't in the current working directory) of the file to be opened or an
integer file descriptor of the file to be wrapped. (If a file
descriptor is given, it is closed when the returned I/O object is
closed, unless closefd is set to False.)
mode is an optional string that specifies the mode in which the file
is opened. It defaults to 'r' which means open for reading in text
mode. Other common values are 'w' for writing (truncating the file if
it already exists), and 'a' for appending (which on some Unix systems,
means that all writes append to the end of the file regardless of the
current seek position). In text mode, if encoding is not specified the
encoding used is platform dependent. (For reading and writing raw
bytes use binary mode and leave encoding unspecified.) The available
modes are:
========= ===============================================================
Character Meaning
--------- ---------------------------------------------------------------
'r' open for reading (default)
'w' open for writing, truncating the file first
'a' open for writing, appending to the end of the file if it exists
'b' binary mode
't' text mode (default)
'+' open a disk file for updating (reading and writing)
'U' universal newline mode (for backwards compatibility; unneeded
for new code)
========= ===============================================================
The default mode is 'rt' (open for reading text). For binary random
access, the mode 'w+b' opens and truncates the file to 0 bytes, while
'r+b' opens the file without truncation.
Python distinguishes between files opened in binary and text modes,
even when the underlying operating system doesn't. Files opened in
binary mode (appending 'b' to the mode argument) return contents as
bytes objects without any decoding. In text mode (the default, or when
't' is appended to the mode argument), the contents of the file are
returned as strings, the bytes having been first decoded using a
platform-dependent encoding or using the specified encoding if given.
buffering is an optional integer used to set the buffering policy.
Pass 0 to switch buffering off (only allowed in binary mode), 1 to select
line buffering (only usable in text mode), and an integer > 1 to indicate
the size of a fixed-size chunk buffer. When no buffering argument is
given, the default buffering policy works as follows:
* Binary files are buffered in fixed-size chunks; the size of the buffer
is chosen using a heuristic trying to determine the underlying device's
"block size" and falling back on `io.DEFAULT_BUFFER_SIZE`.
On many systems, the buffer will typically be 4096 or 8192 bytes long.
* "Interactive" text files (files for which isatty() returns True)
use line buffering. Other text files use the policy described above
for binary files.
encoding is the name of the encoding used to decode or encode the
file. This should only be used in text mode. The default encoding is
platform dependent, but any encoding supported by Python can be
passed. See the codecs module for the list of supported encodings.
errors is an optional string that specifies how encoding errors are to
be handled---this argument should not be used in binary mode. Pass
'strict' to raise a ValueError exception if there is an encoding error
(the default of None has the same effect), or pass 'ignore' to ignore
errors. (Note that ignoring encoding errors can lead to data loss.)
See the documentation for codecs.register for a list of the permitted
encoding error strings.
newline controls how universal newlines works (it only applies to text
mode). It can be None, '', '\n', '\r', and '\r\n'. It works as
follows:
* On input, if newline is None, universal newlines mode is
enabled. Lines in the input can end in '\n', '\r', or '\r\n', and
these are translated into '\n' before being returned to the
caller. If it is '', universal newline mode is enabled, but line
endings are returned to the caller untranslated. If it has any of
the other legal values, input lines are only terminated by the given
string, and the line ending is returned to the caller untranslated.
* On output, if newline is None, any '\n' characters written are
translated to the system default line separator, os.linesep. If
newline is '', no translation takes place. If newline is any of the
other legal values, any '\n' characters written are translated to
the given string.
If closefd is False, the underlying file descriptor will be kept open
when the file is closed. This does not work when a file name is given
and must be True in that case.
open() returns a file object whose type depends on the mode, and
through which the standard file operations such as reading and writing
are performed. When open() is used to open a file in a text mode ('w',
'r', 'wt', 'rt', etc.), it returns a TextIOWrapper. When used to open
a file in a binary mode, the returned class varies: in read binary
mode, it returns a BufferedReader; in write binary and append binary
modes, it returns a BufferedWriter, and in read/write mode, it returns
a BufferedRandom.
It is also possible to use a string or bytearray as a file for both
reading and writing. For strings StringIO can be used like a file
opened in a text mode, and for bytes a BytesIO can be used like a file
opened in a binary mode.
u invalid file: %ru invalid mode: %ru invalid buffering: %ru invalid encoding: %ru invalid errors: %ru arwb+tUu ru wu au +u tu bu Uu$ can't use U and writing mode at onceu' can't have text and binary mode at oncei u) can't have read/write/append mode at onceu/ must have exactly one of read/write/append modeu- binary mode doesn't take an encoding argumentu+ binary mode doesn't take an errors argumentu+ binary mode doesn't take a newline argumentu ii u invalid buffering sizeu can't have unbuffered text I/Ou unknown mode: %rN( t
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t _DocDescriptorc B s e Z d Z d Z RS( u% Helper for builtins.open.__doc__
c C s d t i S( Nu^ open(file, mode='r', buffering=None, encoding=None, errors=None, newline=None, closefd=True)
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R R9 ( ( ( s /usr/lib/python2.6/io.pyR6 s t OpenWrapperc B s e Z d Z e Z d Z RS( u Wrapper for builtins.open
Trick so that open won't become a bound method when stored
as a class variable (as dumbdbm does).
See initstdio() in Python/pythonrun.c.
c O s
t | | S( N( R5 ( t clst argst kwargs( ( s /usr/lib/python2.6/io.pyt __new__ s ( R R
R R6 R> ( ( ( s /usr/lib/python2.6/io.pyR: s t UnsupportedOperationc B s e Z RS( ( R R
( ( ( s /usr/lib/python2.6/io.pyR? " s t IOBasec B s e Z d Z e i Z d Z d d Z d Z d d Z
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Z d d Z e d Z d d Z d Z d Z d Z d Z d d Z d Z d Z d d Z d Z! RS( u The abstract base class for all I/O classes, acting on streams of
bytes. There is no public constructor.
This class provides dummy implementations for many methods that
derived classes can override selectively; the default implementations
represent a file that cannot be read, written or seeked.
Even though IOBase does not declare read, readinto, or write because
their signatures will vary, implementations and clients should
consider those methods part of the interface. Also, implementations
may raise a IOError when operations they do not support are called.
The basic type used for binary data read from or written to a file is
bytes. bytearrays are accepted too, and in some cases (such as
readinto) needed. Text I/O classes work with str data.
Note that calling any method (even inquiries) on a closed stream is
undefined. Implementations may raise IOError in this case.
IOBase (and its subclasses) support the iterator protocol, meaning
that an IOBase object can be iterated over yielding the lines in a
stream.
IOBase also supports the :keyword:`with` statement. In this example,
fp is closed after the suite of the with statment is complete:
with open('spam.txt', 'r') as fp:
fp.write('Spam and eggs!')
c C s t d | i i | f d S( u8 Internal: raise an exception for unsupported operations.u %s.%s() not supportedN( R? t __class__R ( R t name( ( s /usr/lib/python2.6/io.pyt _unsupportedJ s i c C s | i d d S( u Change stream position.
Change the stream position to byte offset offset. offset is
interpreted relative to the position indicated by whence. Values
for whence are:
* 0 -- start of stream (the default); offset should be zero or positive
* 1 -- current stream position; offset may be negative
* 2 -- end of stream; offset is usually negative
Return the new absolute position.
u seekN( RC ( R t post whence( ( s /usr/lib/python2.6/io.pyt seekQ s
c C s | i d d S( u Return current stream position.i i ( RF ( R ( ( s /usr/lib/python2.6/io.pyt tell` s c C s | i d d S( u Truncate file to size bytes.
Size defaults to the current IO position as reported by tell(). Return
the new size.
u truncateN( RC ( R RD ( ( s /usr/lib/python2.6/io.pyt truncated s c C s d S( uu Flush write buffers, if applicable.
This is not implemented for read-only and non-blocking streams.
N( ( R ( ( s /usr/lib/python2.6/io.pyt flushn s c C s? | i p1 y | i Wn t j
o n Xt | _ n d S( ui Flush and close the IO object.
This method has no effect if the file is already closed.
N( t _IOBase__closedRI R R ( R ( ( s /usr/lib/python2.6/io.pyt closew s
c C s y | i Wn n Xd S( u Destructor. Calls close().N( RK ( R ( ( s /usr/lib/python2.6/io.pyt __del__ s c C s t S( u Return whether object supports random access.
If False, seek(), tell() and truncate() will raise IOError.
This method may need to do a test seek().
( R ( R ( ( s /usr/lib/python2.6/io.pyt seekable s c C s5 | i p$ t | d j o d n | n d S( u; Internal: raise an IOError if file is not seekable
u File or stream is not seekable.N( RM R R ( R t msg( ( s /usr/lib/python2.6/io.pyt _checkSeekable s
c C s t S( ud Return whether object was opened for reading.
If False, read() will raise IOError.
( R ( R ( ( s /usr/lib/python2.6/io.pyt readable s c C s5 | i p$ t | d j o d n | n d S( u; Internal: raise an IOError if file is not readable
u File or stream is not readable.N( RP R R ( R RN ( ( s /usr/lib/python2.6/io.pyt _checkReadable s
c C s t S( ut Return whether object was opened for writing.
If False, write() and truncate() will raise IOError.
( R ( R ( ( s /usr/lib/python2.6/io.pyt writable s c C s5 | i p$ t | d j o d n | n d S( u; Internal: raise an IOError if file is not writable
u File or stream is not writable.N( RR R R ( R RN ( ( s /usr/lib/python2.6/io.pyt _checkWritable s
c C s | i S( u closed: bool. True iff the file has been closed.
For backwards compatibility, this is a property, not a predicate.
( RJ ( R ( ( s /usr/lib/python2.6/io.pyt closed s c C s2 | i o$ t | d j o d n | n d S( u8 Internal: raise an ValueError if file is closed
u I/O operation on closed file.N( RT R R ( R RN ( ( s /usr/lib/python2.6/io.pyt _checkClosed s
c C s | i | S( u+ Context management protocol. Returns self.( RU ( R ( ( s /usr/lib/python2.6/io.pyt __enter__ s
c G s | i d S( u+ Context management protocol. Calls close()N( RK ( R R< ( ( s /usr/lib/python2.6/io.pyt __exit__ s c C s | i d d S( u Returns underlying file descriptor if one exists.
An IOError is raised if the IO object does not use a file descriptor.
u filenoN( RC ( R ( ( s /usr/lib/python2.6/io.pyR s c C s | i t S( ui Return whether this is an 'interactive' stream.
Return False if it can't be determined.
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d n t t t f p t d n t } xb d j p t | j oA i | } | p Pn | | 7} | i
d o Pq q Wt | S( u( Read and return a line from the stream.
If limit is specified, at most limit bytes will be read.
The line terminator is always b'\n' for binary files; for text
files, the newlines argument to open can be used to select the line
terminator(s) recognized.
u peekc s_ i d } | p d S| i d d p
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d } n t | t t f p t d n | d j o t | Sd } g } x= | D]5 } | i | | t | 7} | | j o Pqh qh W| S( u Return a list of lines from the stream.
hint can be specified to control the number of lines read: no more
lines will be read if the total size (in bytes/characters) of all
lines so far exceeds hint.
iu hint must be an integeri N( R R R R` R t listt appendR ( R t hintR\ t linesRj ( ( s /usr/lib/python2.6/io.pyt readlines s
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$ t RawIOBasec B s5 e Z d Z d d Z d Z d Z d Z RS( u Base class for raw binary I/O.ic C sa | d j o
d } n | d j o | i St | i } | i | } | | 3t | S( u Read and return up to n bytes.
Returns an empty bytes array on EOF, or None if the object is
set not to block and has no data to read.
ii N( R t readallRa t __index__t readintoRd ( R R\ Rf ( ( s /usr/lib/python2.6/io.pyRb D s
c C sG t } x1 t o) | i t } | p Pn | | 7} q Wt | S( u+ Read until EOF, using multiple read() call.( Ra R Rb R Rd ( R Re t data( ( s /usr/lib/python2.6/io.pyRx S s c C s | i d d S( u Read up to len(b) bytes into b.
Returns number of bytes read (0 for EOF), or None if the object
is set not to block as has no data to read.
u readintoN( RC ( R Rf ( ( s /usr/lib/python2.6/io.pyRz ] s c C s | i d d S( u~ Write the given buffer to the IO stream.
Returns the number of bytes written, which may be less than len(b).
u writeN( RC ( R Rf ( ( s /usr/lib/python2.6/io.pyRq e s ( R R
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R c B s5 e Z d Z d e d Z d Z e d Z RS( u$ Raw I/O implementation for OS files.u rc C s& t i i | | | | | | _ d S( N( t _fileiot _FileIOR t _name( R RB R# R) ( ( s /usr/lib/python2.6/io.pyR v s c C s! t i i | t i | d S( N( R| R} RK Rw ( R ( ( s /usr/lib/python2.6/io.pyRK z s c C s | i S( N( R~ ( R ( ( s /usr/lib/python2.6/io.pyRB ~ s ( R R
R R R RK Rv RB ( ( ( s /usr/lib/python2.6/io.pyR m s t BufferedIOBasec B s, e Z d Z d d Z d Z d Z RS( u Base class for buffered IO objects.
The main difference with RawIOBase is that the read() method
supports omitting the size argument, and does not have a default
implementation that defers to readinto().
In addition, read(), readinto() and write() may raise
BlockingIOError if the underlying raw stream is in non-blocking
mode and not ready; unlike their raw counterparts, they will never
return None.
A typical implementation should not inherit from a RawIOBase
implementation, but wrap one.
c C s | i d d S( u Read and return up to n bytes.
If the argument is omitted, None, or negative, reads and
returns all data until EOF.
If the argument is positive, and the underlying raw stream is
not 'interactive', multiple raw reads may be issued to satisfy
the byte count (unless EOF is reached first). But for
interactive raw streams (XXX and for pipes?), at most one raw
read will be issued, and a short result does not imply that
EOF is imminent.
Returns an empty bytes array on EOF.
Raises BlockingIOError if the underlying raw stream has no
data at the moment.
u readN( RC ( R R\ ( ( s /usr/lib/python2.6/io.pyRb s c C s | i t | } t | } y | | | *WnT t j
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| n | i d | | | *n X| S( u= Read up to len(b) bytes into b.
Like read(), this may issue multiple reads to the underlying raw
stream, unless the latter is 'interactive'.
Returns the number of bytes read (0 for EOF).
Raises BlockingIOError if the underlying raw stream has no
data at the moment.
iNRf ( Rb R R t arrayR ( R Rf R{ R\ t errR ( ( s /usr/lib/python2.6/io.pyRz s
c C s | i d d S( u
Write the given buffer to the IO stream.
Return the number of bytes written, which is never less than
len(b).
Raises BlockingIOError if the buffer is full and the
underlying raw stream cannot accept more data at the moment.
u writeN( RC ( R Rf ( ( s /usr/lib/python2.6/io.pyRq s N( R R
R R Rb Rz Rq ( ( ( s /usr/lib/python2.6/io.pyR s t _BufferedIOMixinc B s e Z d Z d Z d d Z d Z d d Z d Z d Z d Z
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does *not* provide implementations of read(), readinto() or
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c C s
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t _BytesIOc B s} e Z d Z d
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c C s' | i o t d n t | i S( u8 Return the bytes value (contents) of the buffer
u getvalue on closed file( RT R Rd R ( R ( ( s /usr/lib/python2.6/io.pyt getvalue% s
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t | i | i | } | i | i | !} | | _ t | S( Nu read from closed fileiu argument must be an integeri t ( RT R R R R R` R R R R RZ Rd ( R R\ t newposRf ( ( s /usr/lib/python2.6/io.pyRb , s
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( Rb ( R R\ ( ( s /usr/lib/python2.6/io.pyt read1< s c C s | i o t d n t | t o t d n t | } | d j o d S| i } | t | i j o* d | t | i } | i | 7_ n | | i | | | +| i | 7_ | S( Nu write to closed fileu$ can't write unicode to binary streami t ( RT R R t unicodeR R R R ( R Rf R\ RD t padding( ( s /usr/lib/python2.6/io.pyRq A s
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c C s@ | i t i | | | | _ | i t i | _ d S( uM Create a new buffered reader using the given readable raw IO object.
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twice the buffer size.
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writeable respectively. If the buffer_size is omitted it defaults to
DEFAULT_BUFFER_SIZE. The max_buffer_size (for the buffered writer)
defaults to twice the buffer size.
c C s? | i | i t | | | _ t | | | | _ d S( uE Constructor.
The arguments are two RawIO instances.
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writer) defaults to twice the buffer size.
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ic C s | i d d S( u Read at most n characters from stream.
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u readN( RC ( R R\ ( ( s /usr/lib/python2.6/io.pyRb s c C s | i d d S( u Write string s to stream.u writeN( RC ( R t s( ( s /usr/lib/python2.6/io.pyRq s c C s | i d d S( u Truncate size to pos.u truncateN( RC ( R RD ( ( s /usr/lib/python2.6/io.pyRH s c C s | i d d S( u_ Read until newline or EOF.
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returned in one piece.
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or '\r\n' are translated to '\n' before being returned to the
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newline.
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write contains a newline character.
i c
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Read and decode the next chunk of data from the BufferedReader.
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ACC SHELL 2018