什么是冒泡排序算法？
临近的两个元素进行比较，然后互换顺序，一趟走完之后最大的或者最小的元素排在第一个或者最后一个位置（最大或者最小看实际需求），给的的感觉就是一个小泡泡一直冒啊冒，所以有个好听的名字叫冒泡算法
举个例子，有数组[10, 1, 18, 30, 23, 12, 7, 5, 18, 17]，我们使用从小到大的排序方法
第一趟，外排下标为0，对应的值为10
内排开始
①下标0和下标1的值进行比较。10和1比，发现1比10小，进行互换，内排一次完成，结果是[1, 10, 18, 30, 23, 12, 7, 5, 18, 17]
②下标1和下标2的值进行比较。10和18比，10比18小，保持不变，结果是[1, 10, 18, 30, 23, 12, 7, 5, 18, 17]
③下标2和下标3的值进行比较。18和30比，18比30小，保持不变，结果是[1, 10, 18, 30, 23, 12, 7, 5, 18, 17]
④下标3和下标4的值进行比较。30和23比，30比23大，进行互换，结果是[1, 10, 18, 23, 30, 12, 7, 5, 18, 17]
……一直这样紧邻的两个数比下去，第一趟外排结束，结果是[1, 10, 18, 23, 12, 7, 5, 18, 17, 30]，我们发现，我们经过了这一次排序，把最大值30送到了右侧
第二趟，外排下标是1
内排开始
①下标0和下标1的值进行比较。1和10比，1比10小，保持不变，内排一次完成，结果是[1, 10, 18, 23, 12, 7, 5, 18, 17, 30]
②下标1和下标2的值进行比较。10和18比，10比18小，保持不变，内排二次完成，结果是[1, 10, 18, 23, 12, 7, 5, 18, 17, 30]
…………
④下标3和下标4的值进行比较。12和23比，23比12小，进行互换，内排四次完成，结果是[1, 10, 18, 12, 23, 7, 5, 18, 17, 30]
⑤下标4和下标5的值进行比较。23和7比较，23比7大，进行互换，内排五次完成，结果是[1, 10, 18, 12, 7, 23, 5, 18, 17, 30]
…………经过一系列排序，结束，结果为[1, 10, 18, 12, 7, 5, 18, 17, 23, 30]，这个时候我们把第二大的数据23放到正确的位置
第三趟
…………结果为[1, 10, 12, 7, 5, 18, 17, 18, 23, 30]
…………
…………
最终结果为[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
至此，排序完成。
Python3 代码实例
#!/usr/bin/python
# -*- coding: utf-8 -*-
#冒泡排序
def bubble_sort(the_list):
i = 0
while i < len(the_list):
j = 0
while j < len(the_list)-1:
print(the_list[j],the_list[j+1])
if the_list[j] > the_list[j+1]:
the_list[j], the_list[j+1] = the_list[j+1], the_list[j]
j = j+1
print(the_list)
print("======"+str(the_list))
i = i+1
return the_list
if __name__ == '__main__':
the_list = [10, 1, 18, 30, 23, 12, 7, 5, 18, 17]
print("排序前：" + str(the_list))
print("排序后：" + str(bubble_sort(the_list)))
运行结果
排序前：[10, 1, 18, 30, 23, 12, 7, 5, 18, 17]
10 1
[1, 10, 18, 30, 23, 12, 7, 5, 18, 17]
10 18
[1, 10, 18, 30, 23, 12, 7, 5, 18, 17]
18 30
[1, 10, 18, 30, 23, 12, 7, 5, 18, 17]
30 23
[1, 10, 18, 23, 30, 12, 7, 5, 18, 17]
30 12
[1, 10, 18, 23, 12, 30, 7, 5, 18, 17]
30 7
[1, 10, 18, 23, 12, 7, 30, 5, 18, 17]
30 5
[1, 10, 18, 23, 12, 7, 5, 30, 18, 17]
30 18
[1, 10, 18, 23, 12, 7, 5, 18, 30, 17]
30 17
[1, 10, 18, 23, 12, 7, 5, 18, 17, 30]
======[1, 10, 18, 23, 12, 7, 5, 18, 17, 30]
1 10
[1, 10, 18, 23, 12, 7, 5, 18, 17, 30]
10 18
[1, 10, 18, 23, 12, 7, 5, 18, 17, 30]
18 23
[1, 10, 18, 23, 12, 7, 5, 18, 17, 30]
23 12
[1, 10, 18, 12, 23, 7, 5, 18, 17, 30]
23 7
[1, 10, 18, 12, 7, 23, 5, 18, 17, 30]
23 5
[1, 10, 18, 12, 7, 5, 23, 18, 17, 30]
23 18
[1, 10, 18, 12, 7, 5, 18, 23, 17, 30]
23 17
[1, 10, 18, 12, 7, 5, 18, 17, 23, 30]
23 30
[1, 10, 18, 12, 7, 5, 18, 17, 23, 30]
======[1, 10, 18, 12, 7, 5, 18, 17, 23, 30]
1 10
[1, 10, 18, 12, 7, 5, 18, 17, 23, 30]
10 18
[1, 10, 18, 12, 7, 5, 18, 17, 23, 30]
18 12
[1, 10, 12, 18, 7, 5, 18, 17, 23, 30]
18 7
[1, 10, 12, 7, 18, 5, 18, 17, 23, 30]
18 5
[1, 10, 12, 7, 5, 18, 18, 17, 23, 30]
18 18
[1, 10, 12, 7, 5, 18, 18, 17, 23, 30]
18 17
[1, 10, 12, 7, 5, 18, 17, 18, 23, 30]
18 23
[1, 10, 12, 7, 5, 18, 17, 18, 23, 30]
23 30
[1, 10, 12, 7, 5, 18, 17, 18, 23, 30]
======[1, 10, 12, 7, 5, 18, 17, 18, 23, 30]
1 10
[1, 10, 12, 7, 5, 18, 17, 18, 23, 30]
10 12
[1, 10, 12, 7, 5, 18, 17, 18, 23, 30]
12 7
[1, 10, 7, 12, 5, 18, 17, 18, 23, 30]
12 5
[1, 10, 7, 5, 12, 18, 17, 18, 23, 30]
12 18
[1, 10, 7, 5, 12, 18, 17, 18, 23, 30]
18 17
[1, 10, 7, 5, 12, 17, 18, 18, 23, 30]
18 18
[1, 10, 7, 5, 12, 17, 18, 18, 23, 30]
18 23
[1, 10, 7, 5, 12, 17, 18, 18, 23, 30]
23 30
[1, 10, 7, 5, 12, 17, 18, 18, 23, 30]
======[1, 10, 7, 5, 12, 17, 18, 18, 23, 30]
1 10
[1, 10, 7, 5, 12, 17, 18, 18, 23, 30]
10 7
[1, 7, 10, 5, 12, 17, 18, 18, 23, 30]
10 5
[1, 7, 5, 10, 12, 17, 18, 18, 23, 30]
10 12
[1, 7, 5, 10, 12, 17, 18, 18, 23, 30]
12 17
[1, 7, 5, 10, 12, 17, 18, 18, 23, 30]
17 18
[1, 7, 5, 10, 12, 17, 18, 18, 23, 30]
18 18
[1, 7, 5, 10, 12, 17, 18, 18, 23, 30]
18 23
[1, 7, 5, 10, 12, 17, 18, 18, 23, 30]
23 30
[1, 7, 5, 10, 12, 17, 18, 18, 23, 30]
======[1, 7, 5, 10, 12, 17, 18, 18, 23, 30]
1 7
[1, 7, 5, 10, 12, 17, 18, 18, 23, 30]
7 5
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
7 10
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
10 12
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
12 17
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
17 18
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
18 18
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
18 23
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
23 30
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
======[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
1 5
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
5 7
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
7 10
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
10 12
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
12 17
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
17 18
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
18 18
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
18 23
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
23 30
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
======[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
1 5
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
5 7
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
7 10
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
10 12
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
12 17
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
17 18
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
18 18
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
18 23
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
23 30
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
======[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
1 5
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
5 7
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
7 10
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
10 12
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
12 17
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
17 18
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
18 18
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
18 23
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
23 30
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
======[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
1 5
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
5 7
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
7 10
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
10 12
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
12 17
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
17 18
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
18 18
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
18 23
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
23 30
[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
======[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]
排序后：[1, 5, 7, 10, 12, 17, 18, 18, 23, 30]