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| Current File : //usr/lib64/python2.7/_pyio.pyo |
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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
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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.
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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
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the given string.
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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.
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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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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.
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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.
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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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$ 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.
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( 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
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c C s | j d � d S( u� Read and return up to n bytes.
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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.
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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
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TextIOBasec B sn e Z d Z d d � Z d � Z d
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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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newline can be None, '', '\n', '\r', or '\r\n'. It controls the
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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
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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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