Python Mutable Default Trap Shorts IkHIbRxA1tc

Web Reference: Aug 29, 2025 · Ever seen your Python list “remember” values between function calls?That’s the mutable default trap.In Python, default arguments are created once when the fu... Python’s default arguments are evaluated once when the function is defined, not each time the function is called (like it is in say, Ruby). This means that if you use a mutable default argument and mutate it, you will and have mutated that object for all future calls to the function as well. Sep 18, 2025 · So the next time you see a linter warn you about a "mutable default argument," you'll know exactly what it means and how to fix it. You haven't just fixed a bug; you've mastered one of Python's most famous nuances.

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