Evaluate the usage of black for more automatic code formatting

[mfeurer]

https://pypi.org/project/black/

[PGijsbers]

I've been using black in GAMA now since a few weeks. The experience has been good so far. I also took the time to set up a pre-commit hook. Before doing any commit (locally), it will run black, mypy and flake8. The pre-commit has a few benefits:

• You don't have to call black manually, so it can't be forgotten.
• You won't have check-ins with flake8 and mypy errors, which means also no commits that are just "Fix Flake8/mypy". Keeps a cleaner commit history and puts less strain on CI servers.
• If we add configuration files for each of those packages, alongside the pre-commit configuration, everyone runs the same version of the packages with the same configurations. There will be no need for manual setup beyond pre-commit install.

Thoughts?

It shouldn't take a long time to set up, and I'm willing to do that. But I won't have time for it until sometime in May.

[mfeurer]

Thoughts?

That sounds great.

I'm willing to do that.

That's great, too :)

But I won't have time for it until sometime in May.

Fine by me, I guess most of us are busy with the TPAMI SI anyway.

[mfeurer]

This was added in #922