code: def delete_after_days(self, bucket, key, days):
          
          resource = entry(bucket, key)
          return self.__rs_do('deleteAfterDays', resource, days)
docs: 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