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Python implementation of the io module.
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r�| St | | | | | � } | } | | _ | SWn | j � � n Xd S( u� Open file and return a stream. Raise IOError upon failure.
file is either a text or byte 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 i i����u invalid buffering sizeu can't have unbuffered text I/Ou unknown mode: %rN( R t
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DocDescriptorc B s e Z d Z d � Z RS( u% Helper for builtins.open.__doc__
c C s d t j S( Nu\ open(file, mode='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True)
( R? R ( R t objt typ( ( s /usr/lib64/python2.7/_pyio.pyt __get__� s ( R R R RC ( ( ( s /usr/lib64/python2.7/_pyio.pyR@ � 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
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See initstdio() in Python/pythonrun.c.
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t | | � S( N( R? ( t clst argst kwargs( ( s /usr/lib64/python2.7/_pyio.pyt __new__ s ( R R R R@ RH ( ( ( s /usr/lib64/python2.7/_pyio.pyRD � s t UnsupportedOperationc B s e Z RS( ( R R ( ( ( s /usr/lib64/python2.7/_pyio.pyRI s t IOBasec B s
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Change the stream position to byte offset pos. Argument pos is
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* 1 -- current stream position; offset may be negative
* 2 -- end of stream; offset is usually negative
Return the new absolute position.
u seekN( RM ( R t post whence( ( s /usr/lib64/python2.7/_pyio.pyt seek3 s
c C s | j d d � S( u Return current stream position.i i ( RP ( R ( ( s /usr/lib64/python2.7/_pyio.pyt tellB s c C s | j d � d S( u� Truncate file to size bytes.
Size defaults to the current IO position as reported by tell(). Return
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u truncateN( RM ( R RN ( ( s /usr/lib64/python2.7/_pyio.pyt truncateF s c C s | j � d S( uu Flush write buffers, if applicable.
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N( t _checkClosed( R ( ( s /usr/lib64/python2.7/_pyio.pyt flushP s c C s+ | j s' z | j � Wd t | _ Xn d S( ui Flush and close the IO object.
This method has no effect if the file is already closed.
N( t _IOBase__closedRT R ( R ( ( s /usr/lib64/python2.7/_pyio.pyR, Z s c C s y | j � Wn n Xd S( u Destructor. Calls close().N( R, ( R ( ( s /usr/lib64/python2.7/_pyio.pyt __del__e s c C s t S( u� Return whether object supports random access.
If False, seek(), tell() and truncate() will raise IOError.
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( R ( R ( ( s /usr/lib64/python2.7/_pyio.pyt seekables s c C s1 | j � s- t | d k r! d n | � � n d S( u; Internal: raise an IOError if file is not seekable
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( R ( R ( ( s /usr/lib64/python2.7/_pyio.pyt readable� s c C s1 | j � s- t | d k r! d n | � � n d S( u; Internal: raise an IOError if file is not readable
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( R ( R ( ( s /usr/lib64/python2.7/_pyio.pyt writable� s c C s1 | j � s- t | d k r! d n | � � n d S( u; Internal: raise an IOError if file is not writable
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( RU ( R ( ( s /usr/lib64/python2.7/_pyio.pyt closed� s c C s. | j r* t | d k r d n | � � n d S( u7 Internal: raise a ValueError if file is closed
u I/O operation on closed file.N( R^ R R ( R RX ( ( s /usr/lib64/python2.7/_pyio.pyRS � s c C s | j � | S( u+ Context management protocol. Returns self.( RS ( R ( ( s /usr/lib64/python2.7/_pyio.pyt __enter__� s
c G s | j � d S( u+ Context management protocol. Calls close()N( R, ( R RF ( ( s /usr/lib64/python2.7/_pyio.pyt __exit__� s c C s | j 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( RM ( R ( ( s /usr/lib64/python2.7/_pyio.pyR# � s c C s | j � t S( ui Return whether this is an 'interactive' stream.
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| � 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.
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hint can be specified to control the number of lines read: no more
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lines so far exceeds hint.
u integer or None expectedi N( R R R
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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.i����c C sm | d k r d } n | d k r+ | j � St | j � � } | j | � } | d k r\ d S| | 3t | � S( u� Read and return up to n bytes.
Returns an empty bytes object on EOF, or None if the object is
set not to block and has no data to read.
i����i N( R t readallRi t __index__t readintoRl ( R Re Rn ( ( s /usr/lib64/python2.7/_pyio.pyRj & s
c C sQ t � } x- t r8 | j t � } | s+ Pn | | 7} q W| rI t | � S| Sd S( u+ Read until EOF, using multiple read() call.N( Ri R Rj R Rl ( R Rm t data( ( s /usr/lib64/python2.7/_pyio.pyR� 7 s
c C s | j d � d S( u� Read up to len(b) bytes into b.
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is set not to block and has no data to read.
u readintoN( RM ( R Rn ( ( s /usr/lib64/python2.7/_pyio.pyR� E s c C s | j 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( RM ( R Rn ( ( s /usr/lib64/python2.7/_pyio.pyRy M s ( R R R Rj R� R� Ry ( ( ( s /usr/lib64/python2.7/_pyio.pyR s
( R t BufferedIOBasec B sA e Z d Z d d � Z d d � Z 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 | j 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( RM ( R Re ( ( s /usr/lib64/python2.7/_pyio.pyRj j s c C s | j d � d S( u7 Read up to n bytes with at most one read() system call.u read1N( RM ( R Re ( ( s /usr/lib64/python2.7/_pyio.pyt read1~ s c C s� | j t | � � } t | � } y | | | *WnP t k
r� } d d l } t | | j � sh | � n | j 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.
i����NRn ( Rj R R t arrayR ( R Rn R� Re t errR� ( ( s /usr/lib64/python2.7/_pyio.pyR� � s c C s | j d � d S( u� Write the given buffer to the IO stream.
Return the number of bytes written, which is always len(b).
Raises BlockingIOError if the buffer is full and the
underlying raw stream cannot accept more data at the moment.
u writeN( RM ( R Rn ( ( s /usr/lib64/python2.7/_pyio.pyRy � s c C s | j d � d S( u�
Separate the underlying raw stream from the buffer and return it.
After the raw stream has been detached, the buffer is in an unusable
state.
u detachN( RM ( R ( ( s /usr/lib64/python2.7/_pyio.pyt detach� s N( R R R R Rj R� R� Ry R� ( ( ( s /usr/lib64/python2.7/_pyio.pyR� Y 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
write().
c C s
| | _ d S( N( t _raw( R R: ( ( s /usr/lib64/python2.7/_pyio.pyR � s i c C s4 | j j | | � } | d k r0 t d � � n | S( Ni u# seek() returned an invalid position( R: RP R
( R RN RO t new_position( ( s /usr/lib64/python2.7/_pyio.pyRP � s c C s. | j j � } | d k r* t d � � n | S( Ni u# tell() returned an invalid position( R: RQ R
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c C s) | j r t d � � n | j j � d S( Nu flush of closed file( R^ R R: RT ( R ( ( s /usr/lib64/python2.7/_pyio.pyRT � s c C s? | j d k r; | j r; z | j � Wd | j j � Xn d S( N( R: R R^ RT R, ( R ( ( s /usr/lib64/python2.7/_pyio.pyR, � s c C s> | j d k r t d � � n | j � | j } d | _ | S( Nu raw stream already detached( R: R R RT R� ( R R: ( ( s /usr/lib64/python2.7/_pyio.pyR� � s
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t BytesIOc B s� e Z d Z d d � Z d � Z d � Z d d � Z d � Z d � Z d d � Z
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writeable respectively. If the buffer_size is omitted it defaults to
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TextIOBasec B sn e Z d Z d d � Z d � Z d
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i����c C s | j d � d S( u� Read at most n characters from stream.
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u readN( RM ( R Re ( ( s /usr/lib64/python2.7/_pyio.pyRj " s c C s | j d � d S( u Write string s to stream.u writeN( RM ( R t s( ( s /usr/lib64/python2.7/_pyio.pyRy * s c C s | j d � d S( u Truncate size to pos.u truncateN( RM ( R RN ( ( s /usr/lib64/python2.7/_pyio.pyRR . s c C s | j d � d S( u_ Read until newline or EOF.
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u readlineN( RM ( R ( ( s /usr/lib64/python2.7/_pyio.pyRo 2 s c C s | j d � d S( u�
Separate the underlying buffer from the TextIOBase and return it.
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N( R ( R ( ( s /usr/lib64/python2.7/_pyio.pyt newlinesG s c C s d S( uM Error setting of the decoder or encoder.
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codecs.register) and defaults to "strict".
newline can be None, '', '\n', '\r', or '\r\n'. It controls the
handling of line endings. If it is None, universal newlines is
enabled. With this enabled, on input, the lines endings '\n', '\r',
or '\r\n' are translated to '\n' before being returned to the
caller. Conversely, on output, '\n' is translated to the system
default line separator, os.linesep. If newline is any other of its
legal values, that newline becomes the newline when the file is read
and it is returned untranslated. On output, '\n' is converted to the
newline.
If line_buffering is True, a call to flush is implied when a call to
write contains a newline character.
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