Reformat code to PEP 8 standard.

[eguvep]

A major feature of this GUI is, that it is very easy to extend and to maintain. To further help other potential contributors to understand the code, we should follow the PEP 8 standard more strictly.
https://pep8.org/

[alexlib]

Hi @eguvep I tried to use autopep8 and black and even after that I have to pass manually with the flake8 check again to see all kind of messages of whitespace, missing lines, etc.
Do you have an automatic method? I guess it'll be better to include in github workflow the request for autopep8 or similar.

[eguvep]

Thanks, Alex, good point! I found a GitHub action that is doing the job. I hope, we now do not end up with a whole bunch of merge conflicts, now, @ErichZimmer...

[eguvep]

Still, autopep8 just corrects minor format issues like line-length, indention and spaces. All the code style and naming conventions of PEP8 are not touched, of course. We need to have that in mind, every time, we work on the code.

[alexlib]

Still, autopep8 just corrects minor format issues like line-length, indention and spaces. All the code style and naming conventions of PEP8 are not touched, of course. We need to have that in mind, every time, we work on the code.

Let's see how people do it in other packages, something not too complex, e.g. a configuration file for the package black that does automatic formatting or maybe something like autopep8 with a given set of rules. Then every change in the code just goes through this filter and comes out slightly reformatted. With time we'll learn how to write better :)