python快速排序代码实例

一、 算法描述:

1.先从数列中取出一个数作为基准数。2.分区过程,将比这个数大的数全放到它的右边,小于或等于它的数全放到它的左边。3.再对左右区间重复第二步,直到各区间只有一个数。

二、python快速排序代码

代码如下:

#!/usr/bin/python# -*- coding: utf-8 -*-

def sub_sort(array,low,high): key = array[low] while low < high: while low < high and array[high] >= key: high -= 1 while low < high and array[high] < key: array[low] = array[high] low += 1 array[high] = array[low] array[low] = key return low

def quick_sort(array,low,high): if low < high: key_index = sub_sort(array,low,high) quick_sort(array,low,key_index) quick_sort(array,key_index+1,high)

if __name__ == ‘__main__’: array = [8,10,9,6,4,16,5,13,26,18,2,45,34,23,1,7,3] print array quick_sort(array,0,len(array)-1) print array

结果:[8, 10, 9, 6, 4, 16, 5, 13, 26, 18, 2, 45, 34, 23, 1, 7, 3][1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 16, 18, 23, 26, 34, 45]