Python direct assignment, shallow copy and deep copy

Access to:

Direct assignment: is actually the object's reference (alias).

Shallow copy (copy): Copies the parent object and does not copy the inner sub-object of the object.

Deep Copy (deepcopy): The Deepcopy method of the Copy module, which completely copies the parent object and its child objects.

Direct code, at a glance

Example of a shallow copy of a dictionary

>>>a = {1: [+/-]}
>>> B = a.copy ()
>>> A, b
({1: [1, 2, 3]}, {1: [1, 2, 3]})
>>> A[1].append (4)
>>> A, b
({1: [1, 2, 3, 4]}, {1: [1, 2, 3, 4]})

Deep copy requires the introduction of the Copy module:

>>>import Copy
>>> C = copy.deepcopy (a)
>>> A, C
({1: [1, 2, 3, 4]}, {1: [1, 2, 3, 4]})
>>> A[1].append (5)
>>> A, C
({1: [1, 2, 3, 4, 5]}, {1: [1, 2, 3, 4]})

Python direct assignment, shallow copy and deep copy