The method copy() makes a superficial copy of the list, but I do not see any sense to use it, if I want to make a copy of the list I simply do:
lista2 = lista1
Instead of:
lista2 = lista1.copy()
What is the copy() method for?
When, you assign a list to another, what you do is pass a reference to the first list. instead, with a copy you create a new independent instance.
a = [1, 2, 3]
b = a
b[0] = 7
print(a[0]) # devuelve 7
a = [1, 2, 3]
b = a.copy()
b[0] = 7
print(a[0]) # devuelve 1