Copy Lists - Python Tutorial - w3Schools - Ch#25 English

Copy a List
You cannot copy a list simply by typing list2 = list1, because: list2 will only be a reference to list1, and changes made in list1 will automatically also be made in list2.

There are ways to make a copy, one way is to use the built-in List method copy().

Another way to make a copy is to use the built-in method list().