gh-35908: some pep8 fixes in homology/
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### :books: Description
This fixes all pycodestyle warnings except `E226` in the `homology`
folder.
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URL: https://github.com/sagemath/sage/pull/35908
Reported by: Frédéric Chapoton
Reviewer(s): Frédéric Chapoton, Matthias Köppe
