Python uses module zlib to compress and decompress strings and files _python

The zlib module in Python is used to compress or decompress data for storage and transmission. It is the basis for other compression tools. Let's take a look at Python's method of compressing and decompressing strings and files using module zlib. If you don't say more, just look at the sample code.

Example 1: compressing and decompressing strings

Import zlib Message
= ' abcd1234 '
compressed = zlib.compress (message)
decompressed = zlib.decompress ( Compressed)

print ' original: ', repr (message)
print ' compressed: ', repr (compressed)
print ' decompressed: ', repr (decompressed)

Results

Original: ' abcd1234 '
compressed: ' x\x9ckljn1426\x01\x00\x0b\xf8\x02u '
decompressed: ' abcd1234 '

Example 2: compressing and extracting files

Import zlib
def compress (infile, DST, level=9):
 infile = open (infile, ' RB ')
 DST = open (DST, ' WB '
 ) Compress = Zlib.compressobj (level)
 data = Infile.read (1024) while
 data:
  dst.write (Compress.compress ( Data)
  data = Infile.read (1024)
 Dst.write (Compress.flush ())

def decompress (infile, DST):
 infile = Open (infile, ' RB ')
 DST = open (DST, ' WB ')
 decompress = Zlib.decompressobj ()
 data = Infile.read (1024) While
 data:
  dst.write (decompress.decompress (data))
  data = Infile.read (1024)
 Dst.write ( Decompress.flush ())

if __name__ = = "__main__": Compress (' in.txt '
 , ' out.txt ')
 decompress (' OUT.txt ', ' Out_decompress.txt ')

Results

Generating files

Out_decompress.txt OUT.txt

Problem-handling object too large exception

>>> import zlib
>>> a = ' 123 '
>>> B = zlib.compress (a)
>>> b
' x\ X9c342\x06\x00\x01-\x00\x97 '
>>> a = ' a ' * 1024 * 1024 * 1024 *
>>> B = zlib.compress (a)
Traceback (most recent):
 File "<stdin>", line 1, in <module>
overflowerror:size does not fi T in an int

Summarize

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