python3装饰器之为函数添加验证功能（例：访问天猫商城登录账号密码）_使用装饰器,编程增加具有登录验证的函数

#创建账号数据库
user_list = [{'username':'th','passwd':'baoweiluobu'},
             {'username':'my','passwd':'banjia'},
             {'username':'zy','passwd':'songsongsong'},
             ]
 
#初始登录状态信息
current_dic = {'username':None,'login':False}
 
#带有验证功能的函数装饰器
def auth_func(func):
    def wrapper(*args,**kwargs):
        if current_dic['username'] and current_dic['login']:
            res = func(*args,**kwargs)
            return res
        while True:
            username = input('请输入用户名')
            passwd = input('请输入密码')
            for user_dic in user_list:
                if username == user_dic['username'] and passwd == user_dic['passwd']:
                        current_dic['username'] = username
                        current_dic['login'] = True
                        res = func(*args, **kwargs)
                        return res
            else:
                print('用户名或密码错误')
 
    return wrapper
 
@auth_func
def index():
    print('欢迎来到天猫购物商城')
 
@auth_func
def shoppingcar():
    print('购物车：%s，%s，%s' %('葫芦娃','三明治','阿童木'))
 
index()
shoppingcar()