>>> a[1:4] [2, 3, 4]
>>> [1,2,3,4,5,6,7,8][:5] [1, 2, 3, 4, 5] >>> [1,2,3][:5] [1, 2, 3] >>> x = [6,7,8,9,10,11,12] >>> x[:5] [6, 7, 8, 9, 10]