python bz2模块

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单次压缩和解压缩

单次压缩(bz2.compress)

In [40]: compressStr = 'use bz2 module to compress string'In [41]: bz2.compress(compressStr,6)Out[41]: 'BZh61AY&SY\xa5i\x9c"\x00\x00\x0f\x99\x80@\x00\x10\x00\x1e\xa7\xde\x10 \x001M2111\x08\x9ai\xa0h\xf56\xa3\xc3\x06.\x8fh\xf0S{\x83!KF{\xa4i\'\xe2\xeeH\xa7\n\x12\x14\xad3\x84@'In [42]:

单次解压缩(bz2.decompress)

In [43]: bz2.decompress('BZh61AY&SY\xa5i\x9c"\x00\x00\x0f\x99\x80@\x00\x10\x00\x1e\xa7\xde\x10 \x001M2111\x08\x9ai\xa0h\xf56\xa3\xc3\x06.\x8fh\xf0S{\x83!KF{\xa4i\'\xe2\xeeH\xa7\n\x12\x14\xad3\x84@')Out[43]: 'use bz2 module to compress string'In [44]:

创建一个bz2压缩文件

从字符串创建一个bz2压缩文件

#!/usr/bin/env pythonimport bz2import oslinesep = os.linesepcompressStr = 'use bz2 module to compress string'compressFilename = r'/tmp/test.bz2'f = bz2.BZ2File(compressFilename, 'w', compresslevel=6)f.write('%s%s' % (compressStr,linesep))f.close()

测试

[root@control tmp]# python 1.py[root@control tmp]# ls -l /tmp/test.bz2-rw-r--r-- 1 root root 71 Jul 26 08:56 /tmp/test.bz2[root@control tmp]# bzcat /tmp/test.bz2use bz2 module to compress string[root@control tmp]#

从一个文件创建bz2压缩文件

#!/usr/bin/env pythonimport bz2import oslinesep = os.linesepcompressFilename = r'/tmp/test2.bz2'compressFromFile = r'/etc/issue'compressIn = open(compressFromFile, 'r')compressOut = bz2.BZ2File(compressFilename, 'w', compresslevel=6)compressOut.writelines(compressIn)compressOut.close()compressIn.close()

测试

[root@control tmp]# python 2.py[root@control tmp]# ls -l /tmp/test2.bz2-rw-r--r-- 1 root root 90 Jul 26 09:04 /tmp/test2.bz2[root@control tmp]# bzcat /tmp/test2.bz2CentOS release 6.5 (Final)Kernel \r on an \m[root@control tmp]#

使用shutil模块的copyfileobj方法实现类文件对象复制

#!/usr/bin/env pythonimport bz2import shutilcompressFilename = r'/tmp/test3.bz2'compressFromFile = r'/etc/issue'compressIn = open(compressFromFile, 'r')compressOut = bz2.BZ2File(compressFilename, 'w', compresslevel=6)shutil.copyfileobj(compressIn, compressOut)compressOut.close()compressIn.close()

测试

[root@control tmp]# python 3.py[root@control tmp]# ls -l /tmp/test3.bz2-rw-r--r-- 1 root root 90 Jul 26 09:22 /tmp/test3.bz2[root@control tmp]# bzcat /tmp/test3.bz2CentOS release 6.5 (Final)Kernel \r on an \m[root@control tmp]#

查看bz2压缩文件的内容

#!/usr/bin/env pythonimport bz2compressFilename = r'/tmp/test3.bz2'f = bz2.BZ2File(compressFilename, 'r')for eachLine in f:    print eachLine,f.close()

测试

[root@control tmp]# python 4.pyCentOS release 6.5 (Final)Kernel \r on an \m[root@control tmp]#

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