冒泡排序

def sort_list(alist):

n=len(alist)

    while  n>0:

  for i in range(n-2):

if alist[i]>alist[i+1]:

alist[i],alist[i+1] = alist[i+1], alist[i]

 n -=1

if __name__ =="__main__" :

a=[21, 12, 33, 23, 15, 16, 55]

sort_list(a)

print(a)