compression - How to unpack xz file with python which contains only data but no filename?

Question

I have a file, which I can decompress under linux using the following command:

unxz < file.xz > file.txt

How can I do the same using python? If I use python3 and the tarfile module and do the following:

import sys
import tarfile
try:
    with tarfile.open('temp.xz', 'r:xz') as t:
        t.extract()
except Exception as e:
    print("Error:", e.strerror)

I get the exception: ReadError('invalid header',). So apparently it expects some file- or directory information which is not present in the xz file.

So how can I decompress a file without header information?

Answer 1

The tarfile module is only for... err... tar files. What you have here is not one.

---

XZ support is available in Python 3.3's LZMA module. In Python 2.x, you need backports.lzma.

try:
    import lzma
except ImportError:
    from backports import lzma

print lzma.open('file.xz').read()