Web Reference: Jul 16, 2009 · Using mutable values passed in as arguments as local temporaries is an extremely bad idea, whether we're in Python or not and whether there are default arguments involved or not. Feb 3, 2025 · Mutable default parameters persist across function calls, which can cause unexpected behaviour. To avoid issues, use None as a default and create a new object inside the function. 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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