[WIP] Python: Apply "Black" Styling

[ax3l]

Auto-format Python code according to black.

Checks docs, too.
This might not be the best idea, since some files like "first read"/"first write" use carefully crafted, short lines in code examples, so they can go side-by-side with C++ code on many screens.

• Rebase after pre-commit: sort Python includes (PEP8) #1175
• Add flake8 configs: https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html#line-length

[ax3l]

Suggested change

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[franzpoeschel]

This might not be the best idea, since some files like "first read"/"first write" use carefully crafted, short lines in code examples, so they can go side-by-side with C++ code on many screens.

Same issue then with the C++ reformatting? #1032
We could exempt the examples from reformatting in both PRs? Or even just specific examples.

[ax3l]

At the moment, I am just concerned about:

Checks docs, too.

and I think we will serve these two files with an exception :) (have to check how to config that ^^)

I think the clang-format one does not reformat inline code in docs that is not included from example files elsewhere.