Web Reference: Jul 23, 2025 · However, using mutable default values as arguments in Python can lead to unexpected behavior. This article explores the concept of volatile defaults, the potential problems they can cause, and how to use them effectively. 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. 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.
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