装饰器的基本使用：用户登录

users_dic = [{'name':'zsz','passwd':'123'},
            {'name':'alex','passwd':'123'},
            {'name':'lhf','passwd':'123'}]
current_dic = {"username":None,"Login":False}

def auth_func(func):
    def wrapper(*args,**kwargs):
        if current_dic["username"] and current_dic["Login"]:
            res = func(*args,**kwargs)
            return res
        username = input("用户名：").strip()
        passwd = input("密码：").strip()
        for user_dic in users_dic:
            if username == user_dic['name'] and passwd == user_dic['passwd']:
                current_dic["username"] = username
                current_dic["Login"] = True
                res = func(*args, **kwargs)
                return res
        else:
            print("用户名或者密码错误")
    return wrapper

@auth_func  #home = auth_func(home)
def home():
    print("欢迎回家")
@auth_func  #home = auth_func(home)
def shopping():
    print("购物车里有：牛奶，面包，大米")
home()
shopping()

输出结果：

用户名：zsz
密码：123
欢迎回家
购物车里有：牛奶，面包，大米