Copy List

import copy
a = [1, 2, 3]
b = copy.copy(a)
b
[1, 2, 3]
b.append(4)
a
[1, 2, 3]
b
[1, 2, 3, 4]
# deep copy

c = copy.deepcopy(a)
c
[1, 2, 3]

More:

https://stackoverflow.com/questions/2612802/how-to-clone-or-copy-a-list