Python:tarfile流

问题描述

我想从压缩包中读取一些文件并将其保存到新的压缩包中.这是我写的代码.

I would like to read some files from a tarball and save it to a new tarball.This is the code I wrote.

archive = 'dum/2164/archive.tar'

# Read input data.
input_tar = tarfile.open(archive, 'r|')
tarinfo = input_tar.next()
input_tar.close()

# Write output file.
output_tar = tarfile.open('foo.tar', 'w|')
output_tar.addfile(tarinfo)
output_tar.close()

不幸的是，输出的tarball不好:

Unfortunately, the output tarball is no good:

$ tar tf foo.tar
./1QZP_A--2JED_A--not_reformatted.dat.bz2
tar: Truncated input file (needed 1548288 bytes, only 1545728 available)
tar: Error exit delayed from previous errors.

有任何线索如何使用Python即时读写tarball吗?

Any clue how to read and write tarballs on the fly with Python?

推荐答案

好的，这就是我设法做到的方式.

OK so this is how I managed to do it.

archive = 'dum/2164/archive.tar'

# Read input data.
input_tar = tarfile.open(archive, 'r|')
tarinfo = input_tar.next()
fileobj = input_tar.extractfile(tarinfo)

# Write output file.
output_tar = tarfile.open('foo.tar', 'w|')
output_tar.addfile(tarinfo, fileobj)

input_tar.close()
output_tar.close()

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