Pre commit

[ocefpaf]

Continuation of #1567

[ocefpaf]

@Conengmo, b/c this PR touches several files I'll leave to you to merge it or not.

[Conengmo]

Good initiative!

I understand using pre-commit locally. But what is the Github Action supposed to do, will it fail if pre-commit changes something?

By the way, did you see this warning? https://github.com/python-visualization/folium/actions/runs/3220435260

[ocefpaf]

I understand using pre-commit locally. But what is the Github Action supposed to do, will it fail if pre-commit changes something?

If it fails a user can fix it by reading the error message. We could configure pre-commit-ci to commit the fix but I find that very intrusive and leads to conflicts that may confuse new contributors.

[Conengmo]

Great, thanks for explaining. Let's merge this now and once we've got the open PRs out of the way add the same pre-commit stuff as branca has.