python自定义类解包功能

class ApiCodeMsg:
    def __init__(self, code: int, message: str):
        super().__init__()
        self.code = code
        self.message = message

    def __iter__(self):
        yield self.code
        yield self.message

    def keys(self):
        return 'code', 'message'

    def __getitem__(self, item):
        if item == 'code':
            return self.code
        elif item == 'message':
            return self.message
        else:
            raise KeyError(item)


OPEN_API_ACCOUNT_SECRET_ERROR = ApiCodeMsg(code=1001, message='授权密钥串错误')

if __name__ == '__main__':
    print(*OPEN_API_ACCOUNT_SECRET_ERROR) 
    # 1001 授权密钥串错误 需要实现 __iter__
    print({**OPEN_API_ACCOUNT_SECRET_ERROR}) 
    # {'code': 1001, 'message': '授权密钥串错误'} 需要实现 keys,__getitem__