PEP8 style guide about podman-py

[jwhonce]

@danvergara I agree on setting a style. I've been using the black formatter to enforce style. It's a slight delta from PEP8 but not in a bad way. For example, 100 line length vs. 80 (we're no longer using vt100's or IBM cards); enforcing double quotes over single quotes, unless embedded. The best part of black is that it does not change the AST of your code, unlike tools like isort so it's safe to include in automation tool chains.

/cc @mwhahaha @baude

If we're in agreement on this tool, I'll update the CONTRIBUTING.md to reflect this choice. I will also check with our automation guys to see if we could run black on each PR before running the tests.

/cc @cevich @TomSweeneyRedHat

[mwhahaha]

We can also add black to pre-commit or via tox. It'd also be good to ensure we have consistent black configs. Over in OpenStack, black hasn't really picked up any traction so I'm used to the more strict pep8 rules but I think it'd be a good idea to automate it via black.

[cevich]

see if we could run black on each PR before running the tests.

I'm assuming you mean on this repo? There is a a very basic .cirrus.yml here already. Maybe stick the call to the black check above this line?