Style review (flake8)

[sjordan29]

Run flake8 over entire updated code-base and ensure compliance with PEP 8 – Style Guide for Python Code.

[aufdenkampe]

I just came across the Ruff Python Linter and formatter, which supposedly has "Drop-in parity with Flake8, isort, and Black" while also being 50x faster. It looks like it's being adopted by many important Python projects (pandas, FastAPI, etc.). It's probably worth trying.