装饰复杂函数

# 为登录功能添加账号检验功能：必须是3个及以上英文字母组成
def check_user(func):
    def inner(user, pwd):
        if not (user.isalpha() and len(user) >= 3):
            return '账号不合法'
        res = func(user, pwd)
        return res
    return inner

# 为登录功能添加密码检验功能：必须是3个及以上英文字母或数字组成
def check_pwd(func):
    def inner(*args, **kwargs):
        pwd = args[1]
        if not (pwd.isalnum() and len(pwd) >= 3):
            return '密码不合法'
        res = func(*args, **kwargs)
        return res
    return inner

# 对登录结果的修饰装饰器：True=>登录成功 False=>登录失败
def change_res(func):
    def inner(*args, **kwargs):
        res = func(*args, **kwargs)
        if res == True:
            return '登录成功'
        return '登录失败'
    return inner


@check_user  # login = check_user(func=login) = inner
@check_pwd
@change_res
def login(user, pwd):
    if user == 'owen' and pwd == '123':
        return True
    return False

user = input('user: ')
pwd = input('pwd: ')
res = login(user, pwd)

print(res)



# 装饰器：固定写法
def outer(func):
    def inner(*args, **kwargs):
        pass
        res = func(*args, **kwargs)
        pass
        return res
    return inner

@outer
def f1():  # 任意函数
    pass
f1()