How to find existing deb package corresponding to PyPI entry?

Question

PyPI has a lot of packages, and many of them do have deb-equivalents for specific Debian distributions. It usually happens by prepending python- or python3- to the name of the original package, possibly with some other changes like lowercasing, etc, but not always.

Is there are good way to establish PyPI -> Debian version X correspondence in an automatic way?

For example, given a requirements.txt file (or a result of running pip freeze), are there any tools to list Debian packages?

Maybe, there is some service, which can, given "PyPI name", returns search result for Debian? I am not that familiar with Debian tools, but maybe there is a tool, which automates it as part of some process Debian uses?

For example: alembic package. Source package is a basis to create python-prefixed packages. And description points to where it was taken from. Then on PyPI there is a page for specific version files (and maybe a metadata description somewhere).

Can't find it with googling as search results turn out a lot of how to do your very own package, which is a different topic.

The process so far is time-consuming and heavily manual, using apt-file search -l to query for packages containing certain files.

Answer 1

Inspired by this answer: https://askubuntu.com/a/1912

$ apt-file --package-only --regex search 'alembic\-.*\.egg\-info'
python-alembic
python3-alembic
$ apt-file --package-only --regex search 'setuptools\-.*\.egg\-info'
pypy-setuptools
python-setuptools
python3-setuptools

Not sure about the regular expression, most likely it can be improved a lot.

---

Short Python wrapper script as an example:

import argparse
import subprocess

import pkg_resources  # from 'setuptools'


def _main():
    parser = argparse.ArgumentParser(allow_abbrev=False)
    parser.add_argument(
        'requirements',
        metavar='requirements.txt',
        type=argparse.FileType('r'),
    )
    args = parser.parse_args()
    #
    requirements = [
        requirement.project_name
        for requirement
        in pkg_resources.parse_requirements(args.requirements)
    ]
    print(requirements)
    #
    regex = r'({})\-.*\.egg\-info'.format(
        '|'.join(
            [
                requirement.replace('-', '_')
                for requirement
                in requirements
            ],
        ),
    )
    #
    output = subprocess.check_output(
        [
            'apt-file',
            '--package-only',
            '--regex',
            'search',
            regex,
        ],
    )
    print(output.decode())


if __name__ == '__main__':
    _main()