code: def leaderboard(self):
          
          if self._leaderboard is None:
              self.assert_bind_client()
              if self.id is not None:
                  self._leaderboard = self.bind_client.get_segment_leaderboard(self.id)
          return self._leaderboard
docs: The :class:`stravalib.model.SegmentLeaderboard` object for this segment.