Web Reference: Sep 11, 2025 · The general rule of thumb is: Don’t use mutable types (lists, dicts, sets, etc.) as default argument values unless you specifically want that shared behavior. Feb 27, 2026 · The Problem: Default arguments are evaluated once at definition time. The Solution: Use None as the default and initialize the mutable object inside the function body. 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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