A deep copy creates a new object and recursively adds the copies of nested objects present in the original elements.
The deep copy creates independent copy of original object and all its nested objects.
>>> import copy >>> old=[[1,2],[2,3],[3,4]] >>> old [[1, 2], [2, 3], [3, 4]] >>> new=copy.deepcopy(old) >>> new [[1, 2], [2, 3], [3, 4]] >>> old[1][1]='AB' >>> old [[1, 2], [2, 'AB'], [3, 4]] >>> new [[1, 2], [2, 3], [3, 4]] >>>
In the above program, when we assign a new value to old list, we can see only the old list is modified. This means, both the old list and the new list are independent. This is because the old list was recursively copied, which is true for all its nested objects.
Also see Shallow Copy
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