冒泡排序python实现

上代码

#!c:/python33/python

def bubble_sort(arr):
    flag = True
    for i in range(len(arr)-1):
        if not flag:
            break
        flag = False
        for j in range(i, len(arr)):
            if (arr[i]>arr[j]):
                arr[i], arr[j] = arr[j], arr[i]
            flag = True
    return arr;

arr = list(range(20, 0, -1))
print(arr)
print(bubble_sort(arr))