#用户登录(三次错误机会)而且每次输入错误时显示剩余机会count = 3while 0< count <=3: print("还有%s次机会" % (count)) name = input('姓名:') if name == "yeers": print('成功') break else: count -= 1 if count == 0: print('没有机会了')