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BZ2File(name [, mode='r', buffering=0, compresslevel=9]) -> file object
Open a bz2 file. The mode can be 'r' or 'w', for reading (default) or
writing. When opened for writing, the file will be created if it doesn't
exist, and truncated otherwise. If the buffering argument is given, 0 means
unbuffered, and larger numbers specify the buffer size. If compresslevel
is given, must be a number between 1 and 9.
Add a 'U' to mode to open the file for input with universal newline
support. Any line ending in the input file will be seen as a '\n' in
Python. Also, a file so opened gains the attribute 'newlines'; the value
for this attribute is one of None (no newline read yet), '\r', '\n',
'\r\n' or a tuple containing all the newline types seen. Universal
newlines are available only when reading.
BZ2Compressor([compresslevel=9]) -> compressor object
Create a new compressor object. This object may be used to compress
data sequentially. If you want to compress data in one shot, use the
compress() function instead. The compresslevel parameter, if given,
must be a number between 1 and 9.
BZ2Decompressor() -> decompressor object
Create a new decompressor object. This object may be used to decompress
data sequentially. If you want to decompress data in one shot, use the
decompress() function instead.
compress(data [, compresslevel=9]) -> string
Compress data in one shot. If you want to compress data sequentially,
use an instance of BZ2Compressor instead. The compresslevel parameter, if
given, must be a number between 1 and 9.
decompress(data) -> decompressed data
Decompress data in one shot. If you want to decompress data sequentially,
use an instance of BZ2Decompressor instead.
read([size]) -> string
Read at most size uncompressed bytes, returned as a string. If the size
argument is negative or omitted, read until EOF is reached.
readline([size]) -> string
Return the next line from the file, as a string, retaining newline.
A non-negative size argument will limit the maximum number of bytes to
return (an incomplete line may be returned then). Return an empty
string at EOF.
readlines([size]) -> list
Call readline() repeatedly and return a list of lines read.
The optional size argument, if given, is an approximate bound on the
total number of bytes in the lines returned.
xreadlines() -> self
For backward compatibility. BZ2File objects now include the performance
optimizations previously implemented in the xreadlines module.
write(data) -> None
Write the 'data' string to file. Note that due to buffering, close() may
be needed before the file on disk reflects the data written.
writelines(sequence_of_strings) -> None
Write the sequence of strings to the file. Note that newlines are not
added. The sequence can be any iterable object producing strings. This is
equivalent to calling write() for each string.
seek(offset [, whence]) -> None
Move to new file position. Argument offset is a byte count. Optional
argument whence defaults to 0 (offset from start of file, offset
should be >= 0); other values are 1 (move relative to current position,
positive or negative), and 2 (move relative to end of file, usually
negative, although many platforms allow seeking beyond the end of a file).
Note that seeking of bz2 files is emulated, and depending on the parameters
the operation may be extremely slow.
tell() -> int
Return the current file position, an integer (may be a long integer).
close() -> None or (perhaps) an integer
Close the file. Sets data attribute .closed to true. A closed file
cannot be used for further I/O operations. close() may be called more
than once without error.
compress(data) -> string
Provide more data to the compressor object. It will return chunks of
compressed data whenever possible. When you've finished providing data
to compress, call the flush() method to finish the compression process,
and return what is left in the internal buffers.
flush() -> string
Finish the compression process and return what is left in internal buffers.
You must not use the compressor object after calling this method.
decompress(data) -> string
Provide more data to the decompressor object. It will return chunks
of decompressed data whenever possible. If you try to decompress data
after the end of stream is found, EOFError will be raised. If any data
was found after the end of stream, it'll be ignored and saved in
unused_data attribute.
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