Web Reference: Python does not actually have '2-dimensional arrays' as such, it just has lists, which can contain other lists. I will try to demonstrate by means of an example: you define a with a = [[1, 2], [3, 4]]. Then you create a copy of a: b = a.copy. Jul 11, 2025 · To copy a nested list using a for loop, we iterate over each sublist and create a new list for each sublist to ensure nested structure is preserved. This creates a shallow copy where inner lists are copied but the inner elements are still references to the original ones. A nested list is a list that contains other lists as elements. When copying nested lists, we need to create independent copies of both the outer list and inner lists to avoid unwanted modifications.
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