Fixes to work with Python 3.12+

[bje-]

This patch removes the dependence on pkg_resources which is not available by default in Python 3.12 and beyond. It switches from pkg_resources.iter_entry_points to import_metadata.entry_points. import_metadata is available in all supported versions of Python.

The other change removes the use of parse_requirements and just hardcodes the package dependencies in setup.py, which is arguably good practice anyway since not all developer-installed packages are required by the installation.

Finally, setuptools is added to requirements.txt since it is also no longer installed by default with Python 3.12.

[bje-]

Ping?

[bje-]

Can this PR be merged, please?

[Famlam]

Maybe ping @klen in case it went unnoticed

It seems that even installing setuptools manually will stop working soon

UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.

[mshonichev]

ping @klen :)

Can this PR be merged, please, it's very annoying to suppress warnings in CI and it freaks me out that pylama would stop working after CI pipelines upgrade to python 3.12

[b-layer]

Are you sure about import_metadata (with underscore)? Not found for me when I merged this locally. Docs say import.metadata (with period) and that works. (Python 3.12.12)

[cjwatson]

Are you sure about import_metadata (with underscore)? Not found for me when I merged this locally. Docs say import.metadata (with period) and that works. (Python 3.12.12)

importlib_metadata does exist as a backport, but at this point there's no reason to use it any more; all supported Python versions have importlib.metadata in the stdlib. It might be worth explicitly declaring a new enough python_requires.

[bje-]

importlib_metadata does exist as a backport, but at this point there's no reason to use it any more; all supported Python versions have importlib.metadata in the stdlib. It might be worth explicitly declaring a new enough python_requires.

I've updated the PR.