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�r,t||�}n t d!| ��|}|�rF|S t|||||�}|}||_|S |j� � Y nX dS )#a� Open file and return a stream. Raise OSError 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), 'x' for exclusive creation of a new file, 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
'x' create a new file and open it for writing
'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 (deprecated)
========= ===============================================================
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. The 'x' mode implies 'w' and
raises an `FileExistsError` if the file already exists.
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.
'U' mode is deprecated and will raise an exception in future versions
of Python. It has no effect in Python 3. Use newline to control
universal newlines mode.
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 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.
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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
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consider those methods part of the interface. Also, implementations
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IOBase (and its subclasses) support the iterator protocol, meaning
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Nc C s | j d� dS )a� Read and return up to size bytes, where size is an int.
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d#dd�Zdd� Zd d � Zd d � Z� ZS )$�BytesIOz<Buffered I/O implementation using an in-memory bytes buffer.Nc C s& t � }|d k r||7 }|| _d| _d S )Nr )rp �_buffer�_pos)rD Z
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zBytesIO.__init__c C s | j rtd��| jj� S )Nz__getstate__ on closed file)re r" �__dict__�copy)rD r? r? r@ r� K s zBytesIO.__getstate__c C s | j rtd��t| j�S )z8Return the bytes value (contents) of the buffer
zgetvalue on closed file)re r" r r� )rD r? r? r@ �getvalueP s zBytesIO.getvaluec C s | j rtd��t| j�S )z;Return a readable and writable view of the buffer.
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r � r )re r" r! r� r� rk r )rD rm Znewposr r? r? r@ rq b s
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rD } ztd�|�W Y d d }~X nX |dkrl|dk rdtd|f ��|| _nD|dkr�td| j| �| _n(|dkr�tdt| j�| �| _ntd��| jS )Nzseek on closed filezan integer is requiredr znegative seek position %rr
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zBytesIO.truncatec C s | j rtd��dS )Nz I/O operation on closed file.T)re r" )rD r? r? r@ ra � s zBytesIO.readablec C s | j rtd��dS )Nz I/O operation on closed file.T)re r" )rD r? r? r@ rc � s zBytesIO.writablec C s | j rtd��dS )Nz I/O operation on closed file.T)re r" )rD r? r? r@ r^ � s zBytesIO.seekable)N)N)r )N)rH rI rJ rC r� r� r� r� r3 rq r� r} rU rX rY ra rc r^ �
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is used.
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z BufferedReader._read_unlockedr c C s | j � | j|�S Q R X dS )z�Returns buffered bytes without advancing the position.
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N)r� �_peek_unlocked)rD rm r? r? r@ rh s zBufferedReader.peekc C sr t || j�}t| j�| j }||k s,|dkrb| j| }| jj|�}|rb| j| jd � | | _d| _| j| jd � S )Nr )rk r� r! r� r� r; rq )rD rl ZwantZhaveZto_readZcurrentr? r? r@ r� ) s
z BufferedReader._peek_unlockedc C sT |dk rt d��|dkr dS | j�( | jd� | jt|t| j�| j ��S Q R X dS )z<Reads up to size bytes, with at most one read() system call.r z(number of bytes to read must be positiver� r
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zBufferedReader.read1c C s t |t�st|�}|jdkr dS |jd�}d}| j�� x�|t|�k �r tt| j�| j t|��}|r�| j| j| j| � |||| �< | j|7 _||7 }|t|�kr�P t|�| | j kr�| j
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zBufferedReader._readintoc C s t j| �t| j� | j S )N)r� rX r! r� r� )rD r? r? r@ rX t s zBufferedReader.tellc C sX |t krtd��| j�8 |dkr4|t| j�| j 8 }tj| ||�}| j� |S Q R X d S )Nzinvalid whence valuer
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dd� Z ddd�Z dS )r/ z�A buffer for a writeable sequential RawIO object.
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|��W Y d d }~X nX |S Q R X d S )Nzwrite to closed filez can't write str to binary stream)re r" r r r r� r! r� r� �_flush_unlocked�extend�BlockingIOError�errno�strerror)rD r Zbeforer� �eZoverager? r? r@ r} � s(
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zBufferedWriter.truncatec C s | j � | j� W d Q R X d S )N)r� r� )rD r? r? r@ r[ � s zBufferedWriter.flushc C s� | j rtd��xz| jr�y| jj| j�}W n tk
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d��| jd |�= qW d S )Nzflush of closed filezHself.raw should implement RawIOBase: it should not raise BlockingIOErrorz)write could not complete without blockingr z*write() returned incorrect number of bytes) re r" r� r; r} r� � RuntimeErrorr� ZEAGAINr! r, )rD rl r? r? r@ r� � s z BufferedWriter._flush_unlockedc C s t j| �t| j� S )N)r� rX r! r� )rD r? r? r@ rX � s zBufferedWriter.tellr c C s8 |t krtd��| j� | j� tj| ||�S Q R X d S )Nzinvalid whence value)r� r" r� r� r� rU )rD rV rW r? r? r@ rU � s
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dd� Zdd� Zdd� Zed d � �ZdS ) �BufferedRWPaira� A buffered reader and writer object together.
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form a sequential IO object that can read and write. This is typically
used with a socket or two-way pipe.
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writeable respectively. If the buffer_size is omitted it defaults to
DEFAULT_BUFFER_SIZE.
c C s< |j � std��|j� s td��t||�| _t||�| _dS )zEConstructor.
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z#"reader" argument must be readable.z#"writer" argument must be writable.N)ra r, rc r0 �readerr/ �writer)rD r� r� r� r? r? r@ r� � s zBufferedRWPair.__init__Nc C s |d kr d}| j j|�S )Nr
r )r� rq )rD rm r? r? r@ rq � s zBufferedRWPair.readc C s | j j|�S )N)r� r� )rD r r? r? r@ r� � s zBufferedRWPair.readintoc C s | j j|�S )N)r� r} )rD r r? r? r@ r} s zBufferedRWPair.writer c C s | j j|�S )N)r� rh )rD rm r? r? r@ rh s zBufferedRWPair.peekc C s | j j|�S )N)r� r� )rD rm r? r? r@ r� s zBufferedRWPair.read1c C s | j j|�S )N)r� r� )rD r r? r? r@ r�
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dd� Zd S ) r. z�A buffered interface to random access streams.
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c C s( |j � tj| ||� tj| ||� d S )N)r` r0 r� r/ )rD r; r� r? r? r@ r� - s zBufferedRandom.__init__r c C s� |t krtd��| j� | jrJ| j� | jj| jt| j� d� W d Q R X | jj||�}| j� | j � W d Q R X |dk r�t
d��|S )Nzinvalid whence valuer
r z seek() returned invalid position) r� r" r[ r� r� r; rU r� r! r� r, )rD rV rW r? r? r@ rU 2 s $zBufferedRandom.seekc C s | j rtj| �S tj| �S d S )N)r� r/ rX r0 )rD r? r? r@ rX C s
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r )r[ r0 rq )rD rm r? r? r@ rq O s zBufferedRandom.readc C s | j � tj| |�S )N)r[ r0 r� )rD r r? r? r@ r� U s zBufferedRandom.readintoc C s | j � tj| |�S )N)r[ r0 rh )rD rm r? r? r@ rh Y s zBufferedRandom.peekc C s | j � tj| |�S )N)r[ r0 r� )rD rm r? r? r@ r� ] s zBufferedRandom.read1c C s | j � tj| |�S )N)r[ r0 r� )rD r r? r? r@ r� a s zBufferedRandom.readinto1c C sF | j r:| j�( | jj| jt| j � d� | j� W d Q R X tj| |�S )Nr
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zBufferedRandom.write)r )N)N)r )rH rI rJ rC r( r� rU rX rY rq r� rh r� r� r} r? r? r? r@ r. $ s
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|tjO }|ttdd�O }ttdd��p�ttdd�}||O }d}�y|dk �r<|�s�td��|dk�r�tj||d�}n0|||�}t|t��std��|dk �r&td��|}|�s<tj|d� || _tj |�} y(t j | j ��rrt t!j"tj#t!j"�|��W n t$k
�r� Y nX t| dd�| _%| j%dk�r�t&| _%t'�r�t'|tj(� || _)| j�r�tj*|dt+� W n" |dk �r�tj|� � Y nX || _ dS ) ad Open a file. The mode can be 'r' (default), 'w', 'x' or 'a' for reading,
writing, exclusive creation or appending. The file will be created if it
doesn't exist when opened for writing or appending; it will be truncated
when opened for writing. A FileExistsError will be raised if it already
exists when opened for creating. Opening a file for creating implies
writing so this mode behaves in a similar way to 'w'. Add a '+' to the mode
to allow simultaneous reading and writing. A custom opener can be used by
passing a callable as *opener*. The underlying file descriptor for the file
object is then obtained by calling opener with (*name*, *flags*).
*opener* must return an open file descriptor (passing os.open as *opener*
results in functionality similar to passing None).
r Nr
z$integer argument expected, got floatznegative file descriptorzinvalid mode: %szxrwab+c s s | ]}|d kV qdS )ZrwaxNr? )�.0�cr? r? r@ � <genexpr>� s z"FileIO.__init__.<locals>.<genexpr>r zKMust have exactly one of create/read/write/append mode and at most one plusr Tr r r �O_BINARYZ O_NOINHERIT� O_CLOEXECz'Cannot use closefd=False with file namei� z expected integer from openerzNegative file descriptorFr+ r r ),�_fd�_closefdr r3 r �floatr r r" r r �sum�count�_created� _writable�O_EXCL�O_CREAT� _readable�O_TRUNC�
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zFileIO.__init__c C sD | j dkr@| jr@| j r@dd l}|jd| f td| d� | j� d S )Nr zunclosed file %rr )�
stacklevel�source)r� r� re r# r$ �ResourceWarningr3 )rD r# r? r? r@ r] � s
zFileIO.__del__c C s t d| jj��d S )Nz cannot serialize '%s' object)r rR rH )rD r? r? r@ r� � s zFileIO.__getstate__c
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<%s [closed]>z <%s fd=%d mode=%r closefd=%r>z <%s name=%r mode=%r closefd=%r>) rR rI rJ re rS r- r� r2 r� )rD �
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zFileIO.__repr__c C s | j std��d S )NzFile not open for reading)r� rP )rD r? r? r@ rb s zFileIO._checkReadablec C s | j std��d S )NzFile not open for writing)r� rP )rD r_ r? r? r@ rd s zFileIO._checkWritablec C sP | j � | j� |dks |dk r(| j� S ytj| j|�S tk
rJ dS X dS )z�Read at most size bytes, returned as bytes.
Only makes one system call, so less data may be returned than requested
In non-blocking mode, returns None if no data is available.
Return an empty bytes object at EOF.
Nr )rZ rb r� r rq r� r� )rD rm r? r? r@ rq s z FileIO.readc C s� | j � | j� t}y6tj| jdt�}tj| j�j}||krH|| d }W n t k
r^ Y nX t
� }xnt |�|kr�t |�}|t |t�7 }|t |� }ytj
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r� |r�P dS X |s�P ||7 }qhW t|�S )z�Read all data from the file, returned as bytes.
In non-blocking mode, returns as much as is immediately available,
or None if no data is available. Return an empty bytes object at EOF.
r r
N)rZ rb r( r r� r� r r) �st_sizer, rp r! r� rq r� r )rD �bufsizerV �endr< rl r� r? r? r@ r� s4 zFileIO.readallc C s4 t |�jd�}| jt|��}t|�}||d|�< |S )z Same as RawIOBase.readinto().r� N)r� r� rq r! )rD r �mr� rl r? r? r@ r� ? s
zFileIO.readintoc C s8 | j � | j� ytj| j|�S tk
r2 dS X dS )a Write bytes b to file, return number written.
Only makes one system call, so not all of the data may be written.
The number of bytes actually written is returned. In non-blocking mode,
returns None if the write would block.
N)rZ rd r r} r� r� )rD r r? r? r@ r} G s z FileIO.writec C s* t |t�rtd��| j� tj| j||�S )a� Move to new file position.
Argument offset is a byte count. Optional argument whence defaults to
SEEK_SET or 0 (offset from start of file, offset should be >= 0); other values
are SEEK_CUR or 1 (move relative to current position, positive or negative),
and SEEK_END or 2 (move relative to end of file, usually negative, although
many platforms allow seeking beyond the end of a file).
Note that not all file objects are seekable.
zan integer is required)r r� r rZ r r� r� )rD rV rW r? r? r@ rU U s
z FileIO.seekc C s | j � tj| jdt�S )zYtell() -> int. Current file position.
Can raise OSError for non seekable files.r )rZ r r� r� r )rD r? r? r@ rX e s z FileIO.tellc C s2 | j � | j� |dkr | j� }tj| j|� |S )z�Truncate the file to at most size bytes.
Size defaults to the current file position, as returned by tell().
The current file position is changed to the value of size.
N)rZ rd rX r � ftruncater� )rD rm r? r? r@ rY l s zFileIO.truncatec
s. | j s*z| jrtj| j� W dt� j� X dS )z�Close the file.
A closed file cannot be used for further I/O operations. close() may be
called more than once without error.
N)re r� r r3 r� r� )rD )rR r? r@ r3 y s
z FileIO.closec C sF | j � | jdkr@y | j� W n tk
r8 d| _Y nX d| _| jS )z$True if file supports random-access.NFT)rZ � _seekablerX r, )rD r? r? r@ r^ � s
zFileIO.seekablec C s | j � | jS )z'True if file was opened in a read mode.)rZ r� )rD r? r? r@ ra � s zFileIO.readablec C s | j � | jS )z(True if file was opened in a write mode.)rZ r� )rD r? r? r@ rc � s zFileIO.writablec C s | j � | jS )z3Return the underlying file descriptor (an integer).)rZ r� )rD r? r? r@ r* � s z
FileIO.filenoc C s | j � tj| j�S )z.True if the file is connected to a TTY device.)rZ r r' r� )rD r? r? r@ r' � s z
FileIO.isattyc C s | j S )z6True if the file descriptor will be closed by close().)r� )rD r? r? r@ r9 � s zFileIO.closefdc C sJ | j r| jrdS dS n0| jr,| jr&dS dS n| jrB| jr<dS dS ndS dS ) zString giving the file modezxb+Zxbzab+Zabzrb+�rb�wbN)r� r� r� r� )rD r? r? r@ r2 � s z FileIO.moder )r TN)N)N)N)"rH rI rJ r� r� r� r� r� r� r� r� r] r� r� rb rd rq r� r� r} r rU rX rY r3 r^ ra rc r* r' r r9 r2 r� r? r? )rR r@ r& n s8
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TextIOBasez�Base class for text I/O.
This class provides a character and line based interface to stream
I/O. There is no readinto method because Python's character strings
are immutable. There is no public constructor.
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c C s | j d� dS )z�Read at most size characters from stream, where size is an int.
Read from underlying buffer until we have size characters or we hit EOF.
If size is negative or omitted, read until EOF.
Returns a string.
rq N)rT )rD rm r? r? r@ rq � s zTextIOBase.readc C s | j d� dS )z.Write string s to stream and returning an int.r} N)rT )rD �sr? r? r@ r} � s zTextIOBase.writeNc C s | j d� dS )z*Truncate size to pos, where pos is an int.rY N)rT )rD rV r? r? r@ rY � s zTextIOBase.truncatec C s | j d� dS )z_Read until newline or EOF.
Returns an empty string if EOF is hit immediately.
rt N)rT )rD r? r? r@ rt � s zTextIOBase.readlinec C s | j d� dS )z�
Separate the underlying buffer from the TextIOBase and return it.
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r� N)rT )rD r? r? r@ r� � s zTextIOBase.detachc C s dS )zSubclasses should override.Nr? )rD r? r? r@ r6 � s zTextIOBase.encodingc C s dS )z�Line endings translated so far.
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Nr? )rD r? r? r@ �newlines� s zTextIOBase.newlinesc C s dS )zMError setting of the decoder or encoder.
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dS )�IncrementalNewlineDecodera+ Codec used when reading a file in universal newlines mode. It wraps
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records the types of newlines encountered. When used with
translate=False, it ensures that the newline sequence is returned in
one piece.
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" z IncrementalNewlineDecoder.decodec C s@ | j d krd}d}n| j j� \}}|dK }| jr8|dO }||fS )Nr� r r
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errors determines the strictness of encoding and decoding (see the
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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zillegal newline value: %rr �asciiFzinvalid encoding: %rzG%r is not a text encoding; use codecs.open() to handle arbitrary codecsr� zinvalid errors: %rr� g )Nr r� r� r
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