Web Reference: While using new_list = my_list, any modifications to new_list changes my_list every time. Why is this, and how can I clone or copy the list to prevent it? For example: >>> my_list = [1, 2,... Jan 25, 2026 · A list is just an array of references. Copying the list duplicates the references, not the referenced objects. That’s why shallow copies are fast and often correct, but fail for nested, mutable structures. Here’s a minimal demonstration I use to set expectations: Jul 11, 2025 · The copy () method in Python is used to create a shallow copy of a list. This means that the method creates a new list containing the same elements as the original list but maintains its own identity in memory.
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