code: def comments(self):
          
          if self._comments is None:
              self.assert_bind_client()
              if self.comment_count > 0:
                  self._comments = self.bind_client.get_activity_comments(self.id)
              else:
                  # Shortcut if we know there aren't any
                  self._comments = []
          return self._comments
docs: Iterator of :class:`stravalib.model.ActivityComment` objects for this activity.