1, the basic index
The index to find a single way
2, numpy type index
All of the index to write in a list, instead of writing multiple brackets, and the readability is also relatively strong
3, start: end, specify start and end, it does not include the end
Similar slice in python
4、start：end：step
5, the selectivity index
The above sections are based on several ways [start: end: step] slicing the continuous fragment pattern, is selectively indexed random sampling mode