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ZeZG d7d deZG d8d dZG d9d deZG d:d; d;eZ G d d>e Z G d?d d eZ G d@d deZ G dAd d Z!G dBd d Z"d\dFdZ#d]dGdZ$dHd Z%dId Z&dJd! Z'dKd" Z(dLd# Z)dMd$ Z*d^dNd'Z+d_dOd(Z,dPdQ Z-dRdS Z.y4e/dDZ0e/dTZ1e/dUZ2e/dVZ3e/dWZ4e/dXZ5W n. e6k
r` dZ0dZ1dZ2dZ3dZ4dZ5Y nX dZ7e7rtddl8Z8e9dYkre$ej:dZd[e_:e$ej;d[dZe_;dS )`z codecs -- Python Codec Registry, API and helpers.
Written by Marc-Andre Lemburg (mal@lemburg.com).
(c) Copyright CNRI, All Rights Reserved. NO WARRANTY.
N)*z%Failed to load the builtin codecs: %sregisterlookupopen EncodedFileBOMBOM_BEBOM_LEBOM32_BEBOM32_LEBOM64_BEBOM64_LEBOM_UTF8 BOM_UTF16 BOM_UTF16_LE BOM_UTF16_BE BOM_UTF32 BOM_UTF32_LE BOM_UTF32_BE CodecInfoCodecIncrementalEncoderIncrementalDecoder StreamReader StreamWriterStreamReaderWriter
StreamRecoder
getencoder
getdecodergetincrementalencodergetincrementaldecoder getreader getwriterencodedecode
iterencode
iterdecode
strict_errors
ignore_errorsreplace_errorsxmlcharrefreplace_errorsbackslashreplace_errorsnamereplace_errorsregister_error lookup_errors s s s s littlec @ s, e Zd ZdZdZd ddddZdd ZdS )
r z0Codec details when looking up the codec registryTN)_is_text_encodingc
C sP t j| ||||f} || _|| _|| _|| _|| _|| _|| _|d k rL|| _ | S )N)
tuple__new__namer# r$ incrementalencoderincrementaldecoder streamwriter streamreaderr0 )
clsr# r$ r7 r6 r4 r5 r3 r0 self r: /usr/lib64/python3.6/codecs.pyr2 ] s zCodecInfo.__new__c C s d| j j| j j| jt| f S )Nz%<%s.%s object for encoding %s at %#x>) __class__
__module__ __qualname__r3 id)r9 r: r: r; __repr__l s zCodecInfo.__repr__)NNNNN)__name__r= r> __doc__r0 r2 r@ r: r: r: r; r R s
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r a9 Defines the interface for stateless encoders/decoders.
The .encode()/.decode() methods may use different error
handling schemes by providing the errors argument. These
string values are predefined:
'strict' - raise a ValueError error (or a subclass)
'ignore' - ignore the character and continue with the next
'replace' - replace with a suitable replacement character;
Python will use the official U+FFFD REPLACEMENT
CHARACTER for the builtin Unicode codecs on
decoding and '?' on encoding.
'surrogateescape' - replace with private code points U+DCnn.
'xmlcharrefreplace' - Replace with the appropriate XML
character reference (only for encoding).
'backslashreplace' - Replace with backslashed escape sequences.
'namereplace' - Replace with \N{...} escape sequences
(only for encoding).
The set of allowed values can be extended via register_error.
strictc C s t dS )a# Encodes the object input and returns a tuple (output
object, length consumed).
errors defines the error handling to apply. It defaults to
'strict' handling.
The method may not store state in the Codec instance. Use
StreamWriter for codecs which have to keep state in order to
make encoding efficient.
The encoder must be able to handle zero length input and
return an empty object of the output object type in this
situation.
N)NotImplementedError)r9 inputerrorsr: r: r; r# s z Codec.encodec C s t dS )a Decodes the object input and returns a tuple (output
object, length consumed).
input must be an object which provides the bf_getreadbuf
buffer slot. Python strings, buffer objects and memory
mapped files are examples of objects providing this slot.
errors defines the error handling to apply. It defaults to
'strict' handling.
The method may not store state in the Codec instance. Use
StreamReader for codecs which have to keep state in order to
make decoding efficient.
The decoder must be able to handle zero length input and
return an empty object of the output object type in this
situation.
N)rD )r9 rE rF r: r: r; r$ s z Codec.decodeN)rC )rC )rA r= r> rB r# r$ r: r: r: r; r q s
c @ s< e Zd ZdZdddZdddZdd Zd
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ZdS )r z
An IncrementalEncoder encodes an input in multiple steps. The input can
be passed piece by piece to the encode() method. The IncrementalEncoder
remembers the state of the encoding process between calls to encode().
rC c C s || _ d| _dS )z
Creates an IncrementalEncoder instance.
The IncrementalEncoder may use different error handling schemes by
providing the errors keyword argument. See the module docstring
for a list of possible values.
N)rF buffer)r9 rF r: r: r; __init__ s zIncrementalEncoder.__init__Fc C s t dS )zA
Encodes input and returns the resulting object.
N)rD )r9 rE finalr: r: r; r# s zIncrementalEncoder.encodec C s dS )z:
Resets the encoder to the initial state.
Nr: )r9 r: r: r; reset s zIncrementalEncoder.resetc C s dS )z:
Return the current state of the encoder.
r r: )r9 r: r: r; getstate s zIncrementalEncoder.getstatec C s dS )zl
Set the current state of the encoder. state must have been
returned by getstate().
Nr: )r9 stater: r: r; setstate s zIncrementalEncoder.setstateN)rC )F) rA r= r> rB rI r# rK rL rN r: r: r: r; r s
c @ sD e Zd ZdZdddZdd Zddd Zd
d Zd d
Zdd Z dS )BufferedIncrementalEncoderz
This subclass of IncrementalEncoder can be used as the baseclass for an
incremental encoder if the encoder must keep some of the output in a
buffer between calls to encode().
rC c C s t j| | d| _d S )NrG )r rI rH )r9 rF r: r: r; rI s z#BufferedIncrementalEncoder.__init__c C s t d S )N)rD )r9 rE rF rJ r: r: r; _buffer_encode s z)BufferedIncrementalEncoder._buffer_encodeFc C s0 | j | }| j|| j|\}}||d | _ |S )N)rH rP rF )r9 rE rJ dataresultconsumedr: r: r; r# s
z!BufferedIncrementalEncoder.encodec C s t j| d| _d S )NrG )r rK rH )r9 r: r: r; rK s
z BufferedIncrementalEncoder.resetc C s
| j pdS )Nr )rH )r9 r: r: r; rL s z#BufferedIncrementalEncoder.getstatec C s |pd| _ d S )NrG )rH )r9 rM r: r: r; rN s z#BufferedIncrementalEncoder.setstateN)rC )F)
rA r= r> rB rI rP r# rK rL rN r: r: r: r; rO s
rO c @ s< e Zd ZdZdddZdddZdd Zd
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ZdS )r z
An IncrementalDecoder decodes an input in multiple steps. The input can
be passed piece by piece to the decode() method. The IncrementalDecoder
remembers the state of the decoding process between calls to decode().
rC c C s
|| _ dS )z
Create an IncrementalDecoder instance.
The IncrementalDecoder may use different error handling schemes by
providing the errors keyword argument. See the module docstring
for a list of possible values.
N)rF )r9 rF r: r: r; rI s zIncrementalDecoder.__init__Fc C s t dS )z@
Decode input and returns the resulting object.
N)rD )r9 rE rJ r: r: r; r$
s zIncrementalDecoder.decodec C s dS )z9
Reset the decoder to the initial state.
Nr: )r9 r: r: r; rK s zIncrementalDecoder.resetc C s dS )a
Return the current state of the decoder.
This must be a (buffered_input, additional_state_info) tuple.
buffered_input must be a bytes object containing bytes that
were passed to decode() that have not yet been converted.
additional_state_info must be a non-negative integer
representing the state of the decoder WITHOUT yet having
processed the contents of buffered_input. In the initial state
and after reset(), getstate() must return (b"", 0).
r )rT r r: )r9 r: r: r; rL s zIncrementalDecoder.getstatec C s dS )z
Set the current state of the decoder.
state must have been returned by getstate(). The effect of
setstate((b"", 0)) must be equivalent to reset().
Nr: )r9 rM r: r: r; rN & s zIncrementalDecoder.setstateN)rC )F) rA r= r> rB rI r$ rK rL rN r: r: r: r; r s
c @ sD e Zd ZdZdddZdd Zddd Zd
d Zd d
Zdd Z dS )BufferedIncrementalDecoderz
This subclass of IncrementalDecoder can be used as the baseclass for an
incremental decoder if the decoder must be able to handle incomplete
byte sequences.
rC c C s t j| | d| _d S )NrT )r rI rH )r9 rF r: r: r; rI 4 s z#BufferedIncrementalDecoder.__init__c C s t d S )N)rD )r9 rE rF rJ r: r: r; _buffer_decode9 s z)BufferedIncrementalDecoder._buffer_decodeFc C s0 | j | }| j|| j|\}}||d | _ |S )N)rH rV rF )r9 rE rJ rQ rR rS r: r: r; r$ > s
z!BufferedIncrementalDecoder.decodec C s t j| d| _d S )NrT )r rK rH )r9 r: r: r; rK F s
z BufferedIncrementalDecoder.resetc C s
| j dfS )Nr )rH )r9 r: r: r; rL J s z#BufferedIncrementalDecoder.getstatec C s |d | _ d S )Nr )rH )r9 rM r: r: r; rN N s z#BufferedIncrementalDecoder.setstateN)rC )F)
rA r= r> rB rI rV r$ rK rL rN r: r: r: r; rU . s
rU c @ sT e Zd ZdddZdd Zdd Zdd Zdd d Zefd
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dd Z dS )r rC c C s || _ || _dS )aw Creates a StreamWriter instance.
stream must be a file-like object open for writing.
The StreamWriter may use different error handling
schemes by providing the errors keyword argument. These
parameters are predefined:
'strict' - raise a ValueError (or a subclass)
'ignore' - ignore the character and continue with the next
'replace'- replace with a suitable replacement character
'xmlcharrefreplace' - Replace with the appropriate XML
character reference.
'backslashreplace' - Replace with backslashed escape
sequences.
'namereplace' - Replace with \N{...} escape sequences.
The set of allowed parameter values can be extended via
register_error.
N)streamrF )r9 rW rF r: r: r; rI [ s zStreamWriter.__init__c C s" | j || j\}}| jj| dS )z> Writes the object's contents encoded to self.stream.
N)r# rF rW write)r9 objectrQ rS r: r: r; rX t s zStreamWriter.writec C s | j dj| dS )z[ Writes the concatenated list of strings to the stream
using .write().
rG N)rX join)r9 listr: r: r;
writelines{ s zStreamWriter.writelinesc C s dS )a5 Flushes and resets the codec buffers used for keeping state.
Calling this method should ensure that the data on the
output is put into a clean state, that allows appending
of new fresh data without having to rescan the whole
stream to recover state.
Nr: )r9 r: r: r; rK s
zStreamWriter.resetr c C s* | j j|| |dkr&|dkr&| j d S )Nr )rW seekrK )r9 offsetwhencer: r: r; r] s zStreamWriter.seekc C s || j |S )z? Inherit all other methods from the underlying stream.
)rW )r9 r3 getattrr: r: r; __getattr__ s zStreamWriter.__getattr__c C s | S )Nr: )r9 r: r: r; __enter__ s zStreamWriter.__enter__c C s | j j d S )N)rW close)r9 typevaluetbr: r: r; __exit__ s zStreamWriter.__exit__N)rC )r ) rA r= r> rI rX r\ rK r] r` ra rb rg r: r: r: r; r Y s
c @ s e Zd ZeZd ddZd ddZd#dd Zd$d d
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S )'r rC c C s. || _ || _d| _| j | _| j| _d| _dS )a Creates a StreamReader instance.
stream must be a file-like object open for reading.
The StreamReader may use different error handling
schemes by providing the errors keyword argument. These
parameters are predefined:
'strict' - raise a ValueError (or a subclass)
'ignore' - ignore the character and continue with the next
'replace'- replace with a suitable replacement character
'backslashreplace' - Replace with backslashed escape sequences;
The set of allowed parameter values can be extended via
register_error.
rT N)rW rF
bytebuffercharbuffertype_empty_charbuffer
charbuffer
linebuffer)r9 rW rF r: r: r; rI s
zStreamReader.__init__c C s t d S )N)rD )r9 rE rF r: r: r; r$ s zStreamReader.decode Fc C sL | j r | jj| j | _d| _ |dk r(|}x|dkrBt| j|krBP |dk rV| jj }n | jj|}| j| }|srP y| j|| j \}}W n` t
k
r } zD|r| j|d|j | j \}}|j dd} t| dkr n W Y dd}~X nX ||d | _| j|7 _|s*P q*W |dk r*| j}
| j| _n | jd| }
| j|d | _|
S )a Decodes data from the stream self.stream and returns the
resulting object.
chars indicates the number of decoded code points or bytes to
return. read() will never return more data than requested,
but it might return less, if there is not enough available.
size indicates the approximate maximum number of decoded
bytes or code points to read for decoding. The decoder
can modify this setting as appropriate. The default value
-1 indicates to read and decode as much as possible. size
is intended to prevent having to decode huge files in one
step.
If firstline is true, and a UnicodeDecodeError happens
after the first line terminator in the input only the first line
will be returned, the rest of the input will be kept until the
next call to read().
The method should use a greedy read strategy, meaning that
it should read as much data as is allowed within the
definition of the encoding and the given size, e.g. if
optional encoding endings or state markers are available
on the stream, these should be read too.
Nr T)keependsrm )
rl rj rZ rk lenrW readrh r$ rF UnicodeDecodeErrorstart
splitlines) r9 sizechars firstlinenewdatarQ newchars decodedbytesexclinesrR r: r: r; rp sD
zStreamReader.readNTc C s | j rP| j d }| j d= t| j dkr8| j d | _d| _ |sL|jddd }|S |pVd}| j}xr| j|dd}|rt|tr|jd st|t r|jd
r|| jddd 7 }||7 }|jdd}|rt|dkr:|d }|d= t|dkr|d | j7 < || _ d| _n|d | j | _|s8|jddd }P |d }|d jddd }||kr| jj
|dd | j | _|r|}n|}P | s|dk r|r| r|jddd }P |d k rb|d
9 }qbW |S )z Read one line from the input stream and return the
decoded data.
size, if given, is passed as size argument to the
read() method.
r rm NF)rn H T)rv
)rt ru i@ ) rl ro rk rs rj rp
isinstancestrendswithbytesrZ ) r9 rt rn linereadsizerQ r{ line0withendline0withoutendr: r: r; readline s^
zStreamReader.readlinec C s | j }|j|S )aS Read all lines available on the input stream
and return them as a list.
Line breaks are implemented using the codec's decoder
method and are included in the list entries.
sizehint, if given, is ignored since there is no efficient
way to finding the true end-of-line.
)rp rs )r9 sizehintrn rQ r: r: r; readlines] s zStreamReader.readlinesc C s d| _ | j| _d| _dS )z Resets the codec buffers used for keeping state.
Note that no stream repositioning should take place.
This method is primarily intended to be able to recover
from decoding errors.
rT N)rh rj rk rl )r9 r: r: r; rK l s zStreamReader.resetr c C s | j j|| | j dS )zp Set the input stream's current position.
Resets the codec buffers used for keeping state.
N)rW r] rK )r9 r^ r_ r: r: r; r] y s zStreamReader.seekc C s | j }|r|S tdS )z4 Return the next decoded line from the input stream.N)r
StopIteration)r9 r r: r: r; __next__ s zStreamReader.__next__c C s | S )Nr: )r9 r: r: r; __iter__ s zStreamReader.__iter__c C s || j |S )z? Inherit all other methods from the underlying stream.
)rW )r9 r3 r` r: r: r; ra s zStreamReader.__getattr__c C s | S )Nr: )r9 r: r: r; rb s zStreamReader.__enter__c C s | j j d S )N)rW rc )r9 rd re rf r: r: r; rg s zStreamReader.__exit__)rC )rC r r )r r F)NT)NT)r )rA r= r> r ri rI r$ rp r r rK r] r r r` ra rb rg r: r: r: r; r s
P
K
c @ s e Zd ZdZdZd!ddZd#ddZd$d
d Zd%d d
Zdd Z dd Z
dd Z dd Z dd Z
d&ddZefdd Zd d Zd d Zd S )'r a StreamReaderWriter instances allow wrapping streams which
work in both read and write modes.
The design is such that one can use the factory functions
returned by the codec.lookup() function to construct the
instance.
unknownrC c C s( || _ |||| _|||| _|| _dS )aR Creates a StreamReaderWriter instance.
stream must be a Stream-like object.
Reader, Writer must be factory functions or classes
providing the StreamReader, StreamWriter interface resp.
Error handling is done in the same way as defined for the
StreamWriter/Readers.
N)rW readerwriterrF )r9 rW ReaderWriterrF r: r: r; rI s
zStreamReaderWriter.__init__rm c C s | j j|S )N)r rp )r9 rt r: r: r; rp s zStreamReaderWriter.readNc C s | j j|S )N)r r )r9 rt r: r: r; r s zStreamReaderWriter.readlinec C s | j j|S )N)r r )r9 r r: r: r; r s z StreamReaderWriter.readlinesc C s
t | jS )z4 Return the next decoded line from the input stream.)nextr )r9 r: r: r; r s zStreamReaderWriter.__next__c C s | S )Nr: )r9 r: r: r; r s zStreamReaderWriter.__iter__c C s | j j|S )N)r rX )r9 rQ r: r: r; rX s zStreamReaderWriter.writec C s | j j|S )N)r r\ )r9 r[ r: r: r; r\ s z StreamReaderWriter.writelinesc C s | j j | jj d S )N)r rK r )r9 r: r: r; rK s
zStreamReaderWriter.resetr c C s6 | j j|| | jj |dkr2|dkr2| jj d S )Nr )rW r] r rK r )r9 r^ r_ r: r: r; r] s
zStreamReaderWriter.seekc C s || j |S )z? Inherit all other methods from the underlying stream.
)rW )r9 r3 r` r: r: r; ra s z StreamReaderWriter.__getattr__c C s | S )Nr: )r9 r: r: r; rb s z StreamReaderWriter.__enter__c C s | j j d S )N)rW rc )r9 rd re rf r: r: r; rg s zStreamReaderWriter.__exit__)rC r )r )N)N)r )rA r= r> rB encodingrI rp r r r r rX r\ rK r] r` ra rb rg r: r: r: r; r s
c @ s e Zd ZdZdZdZd ddZd ddZd!d
d Zd"d d
Z dd Z
dd Z dd Z dd Z
dd ZefddZdd Zd d Zd S )#r aB StreamRecoder instances translate data from one encoding to another.
They use the complete set of APIs returned by the
codecs.lookup() function to implement their task.
Data written to the StreamRecoder is first decoded into an
intermediate format (depending on the "decode" codec) and then
written to the underlying stream using an instance of the provided
Writer class.
In the other direction, data is read from the underlying stream using
a Reader instance and then encoded and returned to the caller.
r rC c C s4 || _ || _|| _|||| _|||| _|| _dS )a Creates a StreamRecoder instance which implements a two-way
conversion: encode and decode work on the frontend (the
data visible to .read() and .write()) while Reader and Writer
work on the backend (the data in stream).
You can use these objects to do transparent
transcodings from e.g. latin-1 to utf-8 and back.
stream must be a file-like object.
encode and decode must adhere to the Codec interface; Reader and
Writer must be factory functions or classes providing the
StreamReader and StreamWriter interfaces resp.
Error handling is done in the same way as defined for the
StreamWriter/Readers.
N)rW r# r$ r r rF )r9 rW r# r$ r r rF r: r: r; rI s zStreamRecoder.__init__rm c C s" | j j|}| j|| j\}}|S )N)r rp r# rF )r9 rt rQ bytesencodedr: r: r; rp " s zStreamRecoder.readNc C s6 |d kr| j j }n | j j|}| j|| j\}}|S )N)r r r# rF )r9 rt rQ r r: r: r; r ( s
zStreamRecoder.readlinec C s( | j j }| j|| j\}}|jddS )NT)rn )r rp r# rF rs )r9 r rQ r r: r: r; r 1 s
zStreamRecoder.readlinesc C s t | j}| j|| j\}}|S )z4 Return the next decoded line from the input stream.)r r r# rF )r9 rQ r r: r: r; r 7 s
zStreamRecoder.__next__c C s | S )Nr: )r9 r: r: r; r > s zStreamRecoder.__iter__c C s | j || j\}}| jj|S )N)r$ rF r rX )r9 rQ bytesdecodedr: r: r; rX A s zStreamRecoder.writec C s( dj |}| j|| j\}}| jj|S )NrG )rZ r$ rF r rX )r9 r[ rQ r r: r: r; r\ F s
zStreamRecoder.writelinesc C s | j j | jj d S )N)r rK r )r9 r: r: r; rK L s
zStreamRecoder.resetc C s || j |S )z? Inherit all other methods from the underlying stream.
)rW )r9 r3 r` r: r: r; ra Q s zStreamRecoder.__getattr__c C s | S )Nr: )r9 r: r: r; rb X s zStreamRecoder.__enter__c C s | j j d S )N)rW rc )r9 rd re rf r: r: r; rg [ s zStreamRecoder.__exit__)rC r )r )N)N)rA r= r> rB
data_encoding
file_encodingrI rp r r r r rX r\ rK r` ra rb rg r: r: r: r; r s
rrC rm c C sV |dk rd|kr|d }t j| ||}|dkr2|S t|}t||j|j|}||_|S )a> Open an encoded file using the given mode and return
a wrapped version providing transparent encoding/decoding.
Note: The wrapped version will only accept the object format
defined by the codecs, i.e. Unicode objects for most builtin
codecs. Output is also codec dependent and will usually be
Unicode as well.
Underlying encoded files are always opened in binary mode.
The default file mode is 'r', meaning to open the file in read mode.
encoding specifies the encoding which is to be used for the
file.
errors may be given to define the error handling. It defaults
to 'strict' which causes ValueErrors to be raised in case an
encoding error occurs.
buffering has the same meaning as for the builtin open() API.
It defaults to line buffered.
The returned wrapped file object provides an extra attribute
.encoding which allows querying the used encoding. This
attribute is only available if an encoding was specified as
parameter.
Nb)builtinsr r r r7 r6 r )filenamemoder rF bufferingfileinfosrwr: r: r; r ` s c C sF |dkr |}t |}t |}t| |j|j|j|j|}||_||_|S )a Return a wrapped version of file which provides transparent
encoding translation.
Data written to the wrapped file is decoded according
to the given data_encoding and then encoded to the underlying
file using file_encoding. The intermediate data type
will usually be Unicode but depends on the specified codecs.
Bytes read from the file are decoded using file_encoding and then
passed back to the caller encoded using data_encoding.
If file_encoding is not given, it defaults to data_encoding.
errors may be given to define the error handling. It defaults
to 'strict' which causes ValueErrors to be raised in case an
encoding error occurs.
The returned wrapped file object provides two extra attributes
.data_encoding and .file_encoding which reflect the given
parameters of the same name. The attributes can be used for
introspection by Python programs.
N)r r r# r$ r7 r6 r r )r r r rF data_info file_infosrr: r: r; r s c C s
t | jS )z Lookup up the codec for the given encoding and return
its encoder function.
Raises a LookupError in case the encoding cannot be found.
)r r# )r r: r: r; r s c C s
t | jS )z Lookup up the codec for the given encoding and return
its decoder function.
Raises a LookupError in case the encoding cannot be found.
)r r$ )r r: r: r; r s c C s t | j}|dkrt| |S )z Lookup up the codec for the given encoding and return
its IncrementalEncoder class or factory function.
Raises a LookupError in case the encoding cannot be found
or the codecs doesn't provide an incremental encoder.
N)r r4 LookupError)r encoderr: r: r; r s
c C s t | j}|dkrt| |S )z Lookup up the codec for the given encoding and return
its IncrementalDecoder class or factory function.
Raises a LookupError in case the encoding cannot be found
or the codecs doesn't provide an incremental decoder.
N)r r5 r )r decoderr: r: r; r s
c C s
t | jS )z Lookup up the codec for the given encoding and return
its StreamReader class or factory function.
Raises a LookupError in case the encoding cannot be found.
)r r7 )r r: r: r; r! s c C s
t | jS )z Lookup up the codec for the given encoding and return
its StreamWriter class or factory function.
Raises a LookupError in case the encoding cannot be found.
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Encoding iterator.
Encodes the input strings from the iterator using an IncrementalEncoder.
errors and kwargs are passed through to the IncrementalEncoder
constructor.
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Decoding iterator.
Decodes the input strings from the iterator using an IncrementalDecoder.
errors and kwargs are passed through to the IncrementalDecoder
constructor.
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c C s dd | D S )z make_identity_dict(rng) -> dict
Return a dictionary where elements of the rng sequence are
mapped to themselves.
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" s z&make_identity_dict..r: )rngr: r: r; make_identity_dict s r c C s8 i }x.| j D ]"\}}||kr(|||< qd||< qW |S )a Creates an encoding map from a decoding map.
If a target mapping in the decoding map occurs multiple
times, then that target is mapped to None (undefined mapping),
causing an exception when encountered by the charmap codec
during translation.
One example where this happens is cp875.py which decodes
multiple character to \u001a.
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