python用模块zlib压缩与解压字符串和文件的方法

python中zlib模块是用来压缩或者解压缩数据，以便保存和传输。它是其他压缩工具的基础。下面来一起看看python用模块zlib压缩与解压字符串和文件的方法。话不多说，直接来看示例代码。例子1：压缩与解压字符串

import zlibmessage = 'abcd1234'compressed = zlib.compress(message)decompressed = zlib.decompress(compressed)print 'original:', repr(message)print 'compressed:', repr(compressed)print 'decompressed:', repr(decompressed)

结果

original: 'abcd1234'compressed: 'x\x9cKLJN1426\x01\x00\x0b\xf8\x02U'decompressed: 'abcd1234'

例子2：压缩与解压文件

import zlibdef 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')

结果生成文件

out_decompress.txt out.txt

问题――处理对象过大异常

>>> import zlib>>> a = '123'>>> b = zlib.compress(a)>>> b'x\x9c342\x06\x00\x01-\x00\x97'>>> a = 'a' * 1024 * 1024 * 1024 * 10>>> b = zlib.compress(a)Traceback (most recent call last): File "<stdin>", line 1, in <module>OverflowError: size does not fit in an int

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