code: def get_episode_name(self, series, episode_numbers, season_number):
          
          ids = series.to_identifier()
          series_id = ids['ids']['trakt']
  
          epnames = []
          for epno in episode_numbers:
              try:
                  episode = trakt.Trakt['shows'].episode(
                      series_id, season_number, epno, exceptions=True)
              except exceptions.RequestError as err:
                  LOG.exception('fetch episode %s S%sE%s failed',
                                series_id, season_number, epno)
                  return None, str(err)
  
              epnames.append(episode.title)
  
          return epnames, None
docs: Perform lookup for name of episode numbers for a given series.
  
          :param object series: instance of a series
          :param list episode_numbers: the episode sequence number
          :param int season_number: numeric season of series
          :returns: list of episode name
          :rtype: list(str)