优化：快速排序

import random
def quick(list1,l,r):
    if l < r:
        x = random.randint(l,r)#随机取一个数作为基数
        list1[x],list1[r] = list1[r],list1[x]
        key = list1[r]
        i = l
        for j in range(l,r):
            if list1[j] < key:
                list1[j],list1[i] = list1[i],list1[j]
                i += 1
        list1[i],list1[r] = list1[r],list1[i]
        quick(list1,l,i-1)
        quick(list1,i+1,r)
    return list1
li = [2,4,6,1,3,8]
print(quick(li,0,len(li)-1))