Web Reference: PyCharm warns that the default argument is mutable, which may seem obtuse, but what it means is that objects you create using the default are all sharing the same reference to that one default argument. 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 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.
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