python实现冒泡,插入,选择排序简单实例

本文所述的python实现冒泡,插入,选择排序简单实例比较适合python初学者从基础开始学习数据结构和算法,示例简单易懂,具体代码如下:

# -*- coding: cp936 -*-
#python插入排序
def insertsort(a):
for i in range(len(a)-1):
#print a,i
for j in range(i+1,len(a)):
if a[i]>a[j]:
temp = a[i]
a[i] = a[j]
a[j] = temp
return a
#python的冒泡排序
def bubblesort(alist):
for passnum in range(len(alist)-1,0,-1):
#print alist,passnum
for i in range(passnum):
if alist[i]>alist[i+1]:
temp = alist[i]
alist[i] = alist[i+1]
alist[i+1] = temp
return alist
#python的选择排序
def selectionsort(alist):
for i in range(len(alist)-1,0,-1):
maxone = 0
for j in range(1,i+1):
if alist[j]>alist[maxone]:
maxone = j
temp = alist[i]
alist[i] = alist[maxone]
alist[maxone] = temp
return alist
alist = [54,26,93,17,77,31,44,55,20]
#print bubblesort(alist)
alist = [54,26,93,17,77,31,44,55,20]
print selectionsort(alist)

感兴趣的朋友可以动手测试一下本文实例,相信会有新的收获。

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