Hi all, i'm programming in python for the first time (usually i use C as programming language). I don't understand these results: >>> a=[1,2,3,4,5] >>> a[:-1] [1, 2, 3, 4] >>> a[::-1] [5, 4, 3, 2, 1] >>> a[2::-1] [3, 2, 1] what does a[2::-1] means? Thanks