冒泡排序实现

ls = [1, 7, 4, 89, 34, 100, 0]
length  = len(ls)
for i in range(length-1,0,-1):
    print(item)
    #从ls[length-1]开始，遍历列表
    if i == 0:
        continue
    for item in range(length-1,0,-1):
        
        if ls[item] < ls[item-1]:
            #交换位置
            ls[item], ls[item-1] = ls[item-1],ls[item]
            
        else:
            continue
print(ls)