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Python implementation of the io module.
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A helper function to choose the text encoding.
When encoding is not None, this function returns it.
Otherwise, this function returns the default text encoding
(i.e. "locale" or "utf-8" depends on UTF-8 mode).
This function emits an EncodingWarning if *encoding* is None and
sys.flags.warn_default_encoding is true.
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that pass it to TextIOWrapper or open.
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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 str 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 is a string controlling 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.
closedfd is a bool. 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.
The newly created file is non-inheritable.
A custom opener can be used by passing a callable as *opener*. The
underlying file descriptor for the file object is then obtained by calling
*opener* with (*file*, *flags*). *opener* must return an open file
descriptor (passing os.open as *opener* results in functionality similar to
passing None).
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.
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Zd dZd Zd dZed Zd dZd Zd Zd Zd Zd dZd Zd Zd dZ d Z y) IOBasea The abstract base class for all I/O classes.
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represent a file that cannot be read, written or seeked.
Even though IOBase does not declare read or write because
their signatures will vary, implementations and clients should
consider those methods part of the interface. Also, implementations
may raise UnsupportedOperation when operations they do not support are
called.
The basic type used for binary data read from or written to a file is
bytes. Other bytes-like objects are accepted as method arguments too.
Text I/O classes work with str data.
Note that calling any method (even inquiries) on a closed stream is
undefined. Implementations may raise OSError 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 statement is complete:
with open('spam.txt', 'r') as fp:
fp.write('Spam and eggs!')
c L t | j j d|d )z@Internal: raise an OSError exception for unsupported operations..z() not supported)r\ __class__r] )selfnames r _unsupportedzIOBase._unsupported] s& "$(NN$;$;T$C D Dr c & | j d y)a$ Change stream position.
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* 0 -- start of stream (the default); offset should be zero or positive
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Nz File or stream is not seekable.)r r\ rf msgs r _checkSeekablezIOBase._checkSeekable ; }}&*-+ (I @
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Nz File or stream is not writable.)r r\ r s r _checkWritablezIOBase._checkWritable r r c | j S )zclosed: bool. True iff the file has been closed.
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$(T $ r rb ) metaclassc * e Zd ZdZddZd Zd Zd Zy) RawIOBasez Base class for raw binary I/O.c |d}|dk r| j S t |j }| j | }|y||d= t | S )zRead and return up to size bytes, where size is an int.
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return None.
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c & | j d y)a Read and return up to size bytes, where size is an int.
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the byte count (unless EOF is reached first). But for
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r Nrk rf r s r r zBufferedIOBase.read s $
&!r c & | j d y)zaRead up to size bytes with at most one read() system call,
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read1Nrk r s r r zBufferedIOBase.read1 s
'"r c ( | j |d S )af Read bytes into a pre-allocated bytes-like object b.
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Fr _readintor s r r zBufferedIOBase.readinto s ~~au~--r c ( | j |d S )zRead bytes into buffer *b*, using at most one system call
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Tr r r s r readinto1zBufferedIOBase.readinto1 s ~~at~,,r c t |t s t | }|j d }|r| j t | }n| j t | }t | }||d | |S )NB)r+
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FF3K ::c!f%D99SV$D I"1r c & | j d y)a Write the given bytes buffer to the IO stream.
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detachNrk rp s r r zBufferedIOBase.detach
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c |j s t d |j s t d t || | _ t || | _ y)zEConstructor.
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r Nrk rp s r r zTextIOBase.detach> r r c y)zSubclasses should override.Nr` rp s r r zTextIOBase.encodingG s r c y)zLine endings translated so far.
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