Web Reference: Jan 20, 2025 · Understanding the difference between variable assignment by reference and copy in Python is essential for writing correct and efficient code. By knowing when to use references and when to create copies, you can manage memory effectively and avoid bugs caused by unintended data modifications. Every value in Python is a reference (pointer) to an object. Objects cannot be values. Assignment always copies the value (which is a pointer); two such pointers can thus point to the same object. Objects are never copied unless you're doing something explicit to copy them. 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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