[::-1] is used to inverse the order of a sequence.
>>> my_list = [1,2,3,5,6,7,8,9]
>>> my_list[::-1]
[9, 8, 7, 6, 5, 3, 2, 1]
[::-1] is used to inverse the order of a sequence.
>>> my_list = [1,2,3,5,6,7,8,9]
>>> my_list[::-1]
[9, 8, 7, 6, 5, 3, 2, 1]
