setup.py

import re
from setuptools import setup


def derive_version() -> str:
    version = ''
    with open('chat_exporter/__init__.py') as f:
        version = re.search(
            r'^__version__\s*=\s*[\'"]([^\'"]*)[\'"]', f.read(),
            re.MULTILINE,
        ).group(1)

    if not version:
        raise RuntimeError('version is not set')

    if version.endswith(('a', 'b', 'rc')):
        # append version identifier based on commit count
        try:
            import subprocess

            p = subprocess.Popen(
                ['git', 'rev-list', '--count', 'HEAD'],
                stdout=subprocess.PIPE, stderr=subprocess.PIPE,
            )
            out, err = p.communicate()
            if out:
                version += out.decode('utf-8').strip()
            p = subprocess.Popen(
                ['git', 'rev-parse', '--short', 'HEAD'],
                stdout=subprocess.PIPE, stderr=subprocess.PIPE,
            )

            out, err = p.communicate()
            if out:
                version += '+g' + out.decode('utf-8').strip()
        except Exception:
            pass

    return version


if __name__ == "__main__":
    setup(version=derive_version())