Shallow copy vs deep copy in python
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shallow copy and deep copy are two ways to create copies of objects in python, particularly when dealing with nested data structures like lists or dictionaries. understanding the difference between them is important to avoid unexpected behavior when working with mutable objects.
*shallow copy:*
a shallow copy creates a new object but does not create copies of nested objects. instead, it references the nested objects in the original object. this means that changes made to nested objects in the copied structure will affect the original structure and vice versa.
you can create a shallow copy using the `copy()` method for lists or dictionaries, or by using the `copy` module.
*deep copy:*
a deep copy creates a new object and recursively copies all nested objects within it. this means that changes made to the copied structure will not affect the original structure, as they are completely independent.
you can create a deep copy using the `deepcopy()` method from the `copy` module.
*code example:*
output:
as you can see from the example, changes made to the nested list in the shallow copied list affect the original list, while changes made to the nested list in the deep copied list do not affect the original list.
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