https://cs231n.github.io/python-numpy-tutorial/#distance-between-points python 1 2 3 4 5 6 7 8 9 def quicksort(arr):#快排 if len(arr)<= 1: return arr pivot=arr[len(arr)//2] left = [x for x in arr if x < pivot] middle = [x for x in arr if x == pivot] right = [x for x in arr if x > pivot] return