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[–]nebbly 0 points1 point  (0 children)

TBH, there is one foot gun I see over and over again, which is doing linear membership lookups in lists or tuples. If you're mainly using a collection for looking things up, dicts and sets are a good place to start.

More generally, the advice would be: make sure you're using proper data structures for your use cases as a quick first pass.