Get the episode name correspondng to the given show name, season number
    and episode number.

    Parameters
    ----------
      showName : string
        Name of TV show. This must match an entry in the epguides
        title list (this can be achieved by calling ShowNameLookUp first).

      season : int
        Season number.

      epiosde : int
        Epiosde number.

    Returns
    ----------
      string or None
        If an episode name can be found it is returned, otherwise the return
        value is None.

def EpisodeNameLookUp(self, showName, season, episode):
    """
    Get the episode name correspondng to the given show name, season number
    and episode number.

    Parameters
    ----------
      showName : string
        Name of TV show. This must match an entry in the epguides
        title list (this can be achieved by calling ShowNameLookUp first).

      season : int
        Season number.

      epiosde : int
        Epiosde number.

    Returns
    ----------
      string or None
        If an episode name can be found it is returned, otherwise the return
        value is None.
    """
    goodlogging.Log.Info("EPGUIDE", "Looking up episode name for {0} S{1}E{2}".format(showName, season, episode), verbosity=self.logVerbosity)
    goodlogging.Log.IncreaseIndent()
    showID = self._GetShowID(showName)
    if showID is not None:
      try:
        self._showInfoDict[showID]
      except KeyError:
        goodlogging.Log.Info("EPGUIDE", "Looking up info for new show: {0}(ID:{1})".format(showName, showID), verbosity=self.logVerbosity)
        urlData = util.WebLookup(self.EPISODE_LOOKUP_URL, {self.EP_LOOKUP_TAG: showID})
        self._showInfoDict[showID] = self._ExtractDataFromShowHtml(urlData)
      else:
        goodlogging.Log.Info("EPGUIDE", "Reusing show info previous obtained for: {0}({1})".format(showName, showID), verbosity=self.logVerbosity)
      finally:
        episodeName = self._GetEpisodeName(showID, season, episode)
        goodlogging.Log.DecreaseIndent()
        return episodeName
    goodlogging.Log.DecreaseIndent()