Python Mutable vs Immutable Variables
Python handles data in two distinct ways: mutable objects (like lists, dicts, and sets) can be changed in place without flipping their identity, while immutable objects (like strings, int, and tuples) are locked in once they're created. If you try to "change" an immutable variable, Python actually just creates a brand-new object in memory and points your variable to that new address. Understanding this is huge for debugging side effects, especially since passing a mutable list into a function can lead to unexpected changes back in your main logic!
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