replacing items in nested lists python

Question

I am trying to make a duplicate list of lists and change one element to another within the nested lists of the duplicate list but am having some trouble. How I made the dup

Answer 1

import copy
order_1 = copy.deepcopy(order)

Python by default only copies references to mutable values, so changing them in one place results in them being changed everywhere. Creating a deep copy means the two instances are completely independent.