Web Reference: Aug 13, 2025 · Discover the 5 most dangerous default arguments in Python, why they cause bugs, and battle-tested fixes—explained with humor and real-world examples. 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. 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.
YouTube Excerpt: Answer :- C - [1] [1, 1] [1, 1, 1] The mutable
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Last Updated: April 7, 2026
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