Fix a bunch of PEP8 errors

[DjVinnii]

What type of PR?

enhancement (of code styling)

What does this PR do?

As described in the contributing docs, the code should comply with PEP8. I took some time to fix a bunch of errors and warnings (I guess by far all of them). This includes the following rules:

• E101
• E111
• E201
• E302
• E221
• E225
• E231
• E251
• E261
• W191

NOTE: The meaning of the above mentioned rules can be found in for example the ruff docs

I can imagine this is quite a big PR, however it basically all contains of adding or removing whitespace. Also worth mentioning that these changes are done by hand, not using a linter/formatter like black or ruff.

[mergify]

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