Web Reference: Jul 16, 2009 · 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. 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. Instead, the safe and standard practice is to: Use None as the default argument. Check for None inside the function. Create a new mutable object (like my_list=[]) if the argument is None.
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