Mimic 7zip with python

Question

I am using Python 3.6, and currently I subprocess out to my 7zip program to get the compression I need.

subprocess.call('7z a -t7z -ms=off {0} *'.format(filename))

I know the zipfile class has ‘ZIP_LZMA’ compression, but the application I am passing this too says the output file isn’t correct. So what else do I have to add to the ZipFile class to make it mimic the above command?

ZIP files are different from 7Z files. Even if ZIPs might support LZMA compression these days, the files are still different. See stackoverflow.com/questions/32797851/… maybe? — AKX
– AKX, Commented May 21, 2018 at 13:15
@codebase5000, this library perhaps github.com/fancycode/pylzma ? — Tarun Lalwani
– Tarun Lalwani, Commented May 21, 2018 at 15:35
Maybe I should increase the bounty, sounds like python really needs this functionality. — code base 5000
– code base 5000, Commented May 22, 2018 at 14:06

KT. · Accepted Answer · 2018-05-23 21:10:25Z

2

If you do not care much for Windows, then perhaps libarchive could help. In Ubuntu, for example:

$ sudo apt install python3-libarchive-c

Then:

import libarchive with libarchive.file_writer('test.7z', '7zip') as archive: archive.add_files('first.file', 'second.file', 'third.file')

Then there is the pylib7zip library, which wraps the existing 7z.dll and seems to offer a Windows-only alternative.

answered May 23, 2018 at 21:10

KT.

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3 Comments

JabberJabber Over a year ago

Also lib archive-c seems to fail on build

KT. Over a year ago

Pylib7zip is a wrapper around 7z.dll, hence in theory one should be able to squeeze the compression out of it as well - the existence of the FileOutStream class does give some hope.

KT. Over a year ago

To build python_libarchive_c you'd probably need to install the necessary dependencies (e.g. libarchive-dev). The pre-built Ubuntu package somehow works, after all.

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