Check `python_requires` for supported python version (PEP 440)

EDIT: Running pyroma v4.0 with default pyroma settings on a package described below using setuptools, pyroma reports no python version was specified.

It expects to find a python version in the classifiers field (setup(…, classifiers=[SOME PYTHON VERSION(S) HERE])).

There is 2 places to define supported python versions and for now pyroma only support the classifiers one.

setup(
    ....
    python_requires=">=3.8",
    ....
)

[davidandreoletti]

Would you like to submit a PR based on the suggestion above ?

@CAM-Gerlach Yes. Waiting on @regebro’s green light.

[CAM-Gerlach]

I’m surprised I missed python_requires, and that no one noticed until now. 😃

The earliest commit I can see of that particular check is 8 years old, and from the commit message, it may be older than that. That’s long before my time, but I’m not sure it was at least widely implemented by tools and adopted by users at that point, at least not like it is now.

I have no strong opinion on the weights, but I would probably set them at the same weight, personally, but if you want something different that’s fine too.

I’d in turn defer to your judgement as maintainer; its ultimately subjective anyway. My thinking is that since Requires-Python is critical for tools to avoid installing distribution versions that are broken on the user’s Python, whereas the version classifiers are just advisory only, the former would seem to be more important, but it certainly helps having both.