python如何生成tar文件内容

tarfile包中的.open(name, mode)方法能够以mode指定的方式打开name压缩文件，并返回一个TarFile类对象。调用TarFile对象的extractall(path)方法可以将tar文档解压到path指定的位置。

importtarfile
tar=tarfile.open('*.tar.gz',mode="r:gz")#"r:gz"表示openforreadingwithgzipcompression
tar.extractall(path='temp')###将tar.gz文件解压到temp文件夹下
tar.close()

open返回的对象不但可以用来读文档数据（'r': reading），还可以写('w': writing)，附加('a': appending)。

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如下是mode取值所对应的含义：

'r'or'r:*'openforreadingwithtransparentcompression
'r:'openforreadingexclusivelyuncompressed
'r:gz'openforreadingwithgzipcompression
'r:bz2'openforreadingwithbzip2compression
'r:xz'openforreadingwithlzmacompression
'a'or'a:'openforappending,creatingthefileifnecessary
'w'or'w:'openforwritingwithoutcompression
'w:gz'openforwritingwithgzipcompression
'w:bz2'openforwritingwithbzip2compression
'w:xz'openforwritingwithlzmacompression

'x'or'x:'createatarfileexclusivelywithoutcompression,raise
anexceptionifthefileisalreadycreated
'x:gz'createagzipcompressedtarfile,raiseanexception
ifthefileisalreadycreated
'x:bz2'createabzip2compressedtarfile,raiseanexception
ifthefileisalreadycreated
'x:xz'createanlzmacompressedtarfile,raiseanexception
ifthefileisalreadycreated

'r|*'openastreamoftarblockswithtransparentcompression
'r|'openanuncompressedstreamoftarblocksforreading
'r|gz'openagzipcompressedstreamoftarblocks
'r|bz2'openabzip2compressedstreamoftarblocks
'r|xz'openanlzmacompressedstreamoftarblocks
'w|'openanuncompressedstreamforwriting
'w|gz'openagzipcompressedstreamforwriting
'w|bz2'openabzip2compressedstreamforwriting
'w|xz'openanlzmacompressedstreamforwriting