<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def end_log_output(self, **kwargs):
 """Print ending output to log."""

        kwargs.update(dict(
            downloaded_bytes=self.downloaded_bytes,
            num_urls = len(self.result_cache),
        ))
        self.logger.end_log_output(**kwargs)