list1 = [48, 39, 23, 15, 11, 12, 5, 9, 7, 3, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0] def pop_zeros(items): while items[-1] == 0: items.pop() pop_zeros(list1) pop_zeros(list2) print(list1) # Output: [48, 39, 23, 15, 11, 12, 5, 9, 7, 3, 0, 0, 1, 0, 1]