我的想法
顾名思义就是编程里用来切片的手法，在 CISC 1001 里正式的学习，但是感觉在最早接触是在 MATLAB 和 R 。
Slicing means to retrieve a range of items from a sequence (Tuple, List or String)
For example in Tuple
nums = 1,2,3,4,5
tup[1:4]
> (2,3,4)Note that it doesn’t contain the last element! (5 in location 4)
nums = 1,2,3,4,5
tup[0::2]
> (1,3,5):: 代表间隔（stride）
Negative
The slicing technique is quite interesting, it can be negative!
-1 is the last item. In the example, it is 5
nums = 1,2,3,4,5
tup[-4:-2]
> (2,3)Still notice that no last element