写一个python冒泡排序代码

def bubble_sort(arr): n = len(arr) for i in range(n): for j in range(0, n-i-1): if arr[j] > arr[j+1]: arr[j], arr[j+1] = arr[j+1], arr[j]

arr = [64, 34, 25, 12, 22, 11, 90] bubble_sort(arr) print("排序后的数组：") for i in range(len(arr)): print("%d" %arr[i]),