mutable-default-args

Python Programming Learning Circle

Feb 8, 2020 · Fundamentals

Common Python Pitfalls and How to Avoid Them

This article surveys typical Python traps—including UnboundLocalError, mutable default arguments, in‑place versus out‑of‑place updates, tuple syntax, shared mutable containers, list mutation during iteration, closure late binding, __del__ pitfalls, import inconsistencies, version differences, operator quirks, attribute magic methods, and the GIL—explaining why they occur and offering safe alternatives.