def delete_after_days(self, bucket, key, days):
        """更新文件生命周期

        Returns:
            一个dict变量，返回结果类似：
                [
                    { "code": <HttpCode int>, "data": <Data> },
                    { "code": <HttpCode int> },
                    { "code": <HttpCode int> },
                    { "code": <HttpCode int> },
                    { "code": <HttpCode int>, "data": { "error": "<ErrorMessage string>" } },
                    ...
                ]
            一个ResponseInfo对象
        Args:
            bucket: 目标资源空间
            key:    目标资源文件名
            days:   指定天数
        """
        resource = entry(bucket, key)
        return self.__rs_do('deleteAfterDays', resource, days)