python数据压缩，以下模块直接支持通用的数据打包和压缩格式：zlib，gzip，bz2，zipfile 以及 tarfile:
>>> import zlib >>> s = b'witch which has which witches wrist watch' >>> len(s) 41 >>> t = zlib.compress(s) >>> len(t) 37 >>> zlib.decompress(t) b'witch which has which witches wrist watch' >>> zlib.crc32(s) 226805979
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