Web Reference: Mar 26, 2026 · Python uses a model called passing by object reference (sometimes called passing by assignment). When you pass a variable to a function in Python, you're passing a reference to the object that variable points to, not a copy of the value, and not the variable itself. Jun 12, 2009 · In Python, a variable is a name (captured internally as a string) bound to the reference variable that holds the reference value to the target object. The name of the variable is the key in the internal dictionary, the value part of that dictionary item stores the reference value to the target. Oct 4, 2025 · When you pass an argument to a function, Python passes the reference (address) of the object, not the actual object or a copy. Whether the original data changes depends on whether the object is mutable (can be changed in place) or immutable (cannot be changed once created).
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