Avoid shadowing builtins

This will hopefully avoid nasty surprises in the future. It's easy to
check since there is already a ruff linter [1] for it which this commit
also enables. Make sure not to complain about exit() [2] since that is
only for interactive use and shouldn't be called in programs anyway.

[1] https://docs.astral.sh/ruff/rules/builtin-attribute-shadowing/
[2] https://docs.python.org/3.12/library/constants.html#exit

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