登录加法装饰器

def login(func):
    def wrapper(*args, **kwargs):
        if user_list:
            print('请勿重复登录')
            res = func(*args, **kwargs)
            return res

        name_inp = input('name:')
        pwd_inp = input('password:')
        with open('user_info.txt', 'r', encoding='utf8') as fr:
            for user_info in fr:
                name, pwd = user_info.strip().split(':')
                if name == name_inp and pwd == pwd_inp:
                    user_list.append(name)
                    print('登录成功!')
                    res = func(*args, **kwargs)
                    return res
            else:
                print('不匹配')

    return wrapper


@login #add = login(add)
def add(x, y):
    print(x + y)

while 1:
    add(10, 20)