Web Reference: Oct 27, 2025 · Learn to use Python's optional arguments to handle variable inputs. Build flexible functions and avoid common errors when setting defaults. 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. This is especially important to understand when a default parameter is a mutable object, such as a list or a dictionary: if the function modifies the object (e.g. by appending an item to a list), the default value is in effect modified.
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