Web Reference: 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. Mar 18, 2026 · In Python, functions can have default arguments, which are parameters with predefined values. This means you don’t always need to pass every argument while calling a function. Jun 1, 2025 · Today, I want to share a common trap in Python — the surprising behavior when using mutable objects (like lists) as default values in class attributes.
YouTube Excerpt: What happens when you use a mutable
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