python中关于装饰器的学习

import timedef timer(hello):    def func(*args,**kwargs):    #函数传参，不限个数。        start = time.time()        hello(*args,**kwargs)    #函数传参，不限个数。        end = time.time()        print("运行时间：%s"%(end - start))    return func@timerdef hello():    time.sleep(2)    print("nihao")hello()

import timeuser = {                           #存储用户名和密码    "luozeng":'123',    "xuemanfei":'456',    "xutian":'789'}def yanzheng(hello):    def func(*args,**kwargs):        start = time.time()        username = input("请输入用户：").strip()     #用户输入        password = input("请输入密码：").strip()        if username in user and password == user[username]:        #用户名和密码验证            print("登陆成功")            hello(*args,**kwargs)        else:            exit("用户名或密码错误！")        end = time.time()        print("运行时间：%s"%(end - start))    return func@yanzhengdef hello():    print("你好！")hello()