zlib_incremental.py

#1/usr/bin/env python

# this is from The Python
# Standard Library by example
# ISBN13: 9780321767349

import zlib
import binascii

compressor = zlib.compressobj(1)

with open('lorem.txt', 'r') as input:
    while True:
        block = input.read(64)
        if not block:
            break
        compressed = compressor.compress(block)
        if compressed:
            print 'Compressed: %s' % binascii.hexlify(compressed)
        else:
            print 'buffering...'
    remaining = compressor.flush()
    print 'Flushed: %s' % binascii.hexlify(remaining)