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rg)zInterface to the libbzip2 compression library.
This module provides a file interface, classes for incremental
(de)compression, and functions for one-shot (de)compression.
)BZ2File
BZ2CompressorBZ2Decompressoropencompress
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rSS jrS S jrS S jrS rS S jrS S jrS rS r\R0 4S jrS rSrg) r a, A file object providing transparent bzip2 (de)compression.
A BZ2File can act as a wrapper for an existing file object, or refer
directly to a named file on disk.
Note that BZ2File provides a *binary* file interface - data read is
returned as bytes, and data to be written should be given as bytes.
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Xl X@l O [ S5 eU R [ :X aD [ R" " U R [$ [& S9n[( R* " U5 U l gSU l g)a Open a bzip2-compressed file.
If filename is a str, bytes, or PathLike object, it gives the
name of the file to be opened. Otherwise, it should be a file
object, which will be used to read or write the compressed data.
mode can be 'r' for reading (default), 'w' for (over)writing,
'x' for creating exclusively, or 'a' for appending. These can
equivalently be given as 'rb', 'wb', 'xb', and 'ab'.
If mode is 'w', 'x' or 'a', compresslevel can be a number between 1
and 9 specifying the level of compression: 1 produces the least
compression, and 9 (default) produces the most compression.
If mode is 'r', the input file may be the concatenation of
multiple compressed streams.
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z%compresslevel must be between 1 and 9) rrbr )wwbr )xxbr )aabr Invalid mode: Treadwritez6filename must be a str, bytes, file or PathLike object)trailing_errorr )_fp_closefp_mode
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SU l f = f= f)zFlush and close the file.
May be called more than once without error. Once the file is
closed, any other operation on it will raise a ValueError.
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c U R SL $ )z True if this file is closed.N)r rA s r9 r> BZ2File.closedx s xx4 r< c N U R 5 U R R $ )N)_check_not_closedr namerA s r9 rG BZ2File.name} s xx}} r< c 2 U R [ :X a S$ S$ )Nr r )r r# rA s r9 r6 BZ2File.mode s zz[0t:d:r< c V U R 5 U R R 5 $ )z3Return the file descriptor for the underlying file.)rF r filenorA s r9 rL BZ2File.fileno s xx r< c d U R 5 =( a U R R 5 $ )z)Return whether the file supports seeking.)readabler2 seekablerA s r9 rP BZ2File.seekable s }}:4<<#8#8#::r< c H U R 5 U R [ :H $ )z/Return whether the file was opened for reading.)rF r r" rA s r9 rO BZ2File.readable s zzZ''r< c H U R 5 U R [ :H $ )z/Return whether the file was opened for writing.)rF r r# rA s r9 writableBZ2File.writable s zz[((r< c X U R 5 U R R U5 $ )zReturn buffered data without advancing the file position.
Always returns at least one byte of data, unless at EOF.
The exact number of bytes returned is unspecified.
)_check_can_readr2 peek)r4 ns r9 rY BZ2File.peek s'
|| ##r< c X U R 5 U R R U5 $ )zRead up to size uncompressed bytes from the file.
If size is negative or omitted, read until EOF is reached.
Returns b'' if the file is already at EOF.
)rX r2 r r4 sizes r9 r BZ2File.read s%
|| &&r< c U R 5 US: a [ R nU R R U5 $ )zRead up to size uncompressed bytes, while trying to avoid
making multiple reads from the underlying stream. Reads up to a
buffer's worth of data if size is negative.
Returns b'' if the file is at EOF.
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!8))D||!!$''r< c X U R 5 U R R U5 $ )zBRead bytes into b.
Returns the number of bytes read (0 for EOF).
)rX r2 readinto)r4 bs r9 re BZ2File.readinto s%
||$$Q''r< c [ U[ 5 ( d, [ US5 ( d [ S5 eUR 5 nU R 5 U R R U5 $ )zRead a line of uncompressed bytes from the file.
The terminating newline (if present) is retained. If size is
non-negative, no more than size bytes will be read (in which
case the line may be incomplete). Returns b'' if already at EOF.
__index__Integer argument expected)r% intr+ r, ri rX r2 readliner] s r9 rl BZ2File.readline sW $$$4-- ;<<>>#D ||$$T**r< c [ U[ 5 ( d, [ US5 ( d [ S5 eUR 5 nU R 5 U R R U5 $ )zRead a list of lines of uncompressed bytes from the file.
size can be specified to control the number of lines read: no
further lines will be read once the total size of the lines read
so far equals or exceeds size.
ri rj )r% rk r+ r, ri rX r2 readlinesr] s r9 ro BZ2File.readlines sW $$$4-- ;<<>>#D ||%%d++r< c 8 U R 5 [ U[ [ 45 ( a [ U5 nO[ U5 nUR nU R R U5 nU R R U5 U =R U-
sl U$ )zWrite a byte string to the file.
Returns the number of uncompressed bytes written, which is
always the length of data in bytes. Note that due to buffering,
the file on disk may not reflect the data written until close()
is called.
) _check_can_writer% r' bytearraylen
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r< c @ [ R R X5 $ )zWrite a sequence of byte strings to the file.
Returns the number of uncompressed bytes written.
seq can be any iterable yielding byte strings.
Line separators are not added between the written byte strings.
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writelines)r4 seqs r9 r} BZ2File.writelines s &&11$< rG r6 rL rP rO rU rY r rb re rl ro r r} r0 SEEK_SETr r __static_attributes__ r< r9 r r s :A :x$. ; ;!
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" XsXE5 $ U$ ) a Open a bzip2-compressed file in binary or text mode.
The filename argument can be an actual filename (a str, bytes, or
PathLike object), or an existing file object to read from or write
to.
The mode argument can be "r", "rb", "w", "wb", "x", "xb", "a" or
"ab" for binary mode, or "rt", "wt", "xt" or "at" for text mode.
The default mode is "rb", and the default compresslevel is 9.
For binary mode, this function is equivalent to the BZ2File
constructor: BZ2File(filename, mode, compresslevel). In this case,
the encoding, errors and newline arguments must not be provided.
For text mode, a BZ2File object is created, and wrapped in an
io.TextIOWrapper instance with the specified encoding, error
handling behavior, and line ending(s).
trf r z0Argument 'encoding' not supported in binary modez.Argument 'errors' not supported in binary modez/Argument 'newline' not supported in binary moder r )r! replacer r0
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d{##H- vGGr< c \ [ U5 nUR U 5 UR 5 - $ )zCompress a block of data.
compresslevel, if given, must be a number between 1 and 9.
For incremental compression, use a BZ2Compressor object instead.
)r r r@ )rw r comps r9 r r A s( 'D == --r< c $ / nU ( a^ [ 5 n UR U 5 nUR U5 UR ( d [ S5 eUR n U ( a M^ SR U5 $ ! [ a U( a M% e f = f)zbDecompress a block of data.
For incremental decompression, use a BZ2Decompressor object instead.
zACompressed data ended before the end-of-stream marker was reachedr< )r r r/ appendeofr! unused_datajoin)rw resultsdecompress r9 r r L s
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