code: def sessions_in_range(self, start_session_label, end_session_label):
          
          return self.all_sessions[
              self.all_sessions.slice_indexer(
                  start_session_label,
                  end_session_label
              )
          ]
docs: Given start and end session labels, return all the sessions in that
          range, inclusive.
  
          Parameters
          ----------
          start_session_label: pd.Timestamp (midnight UTC)
              The label representing the first session of the desired range.
  
          end_session_label: pd.Timestamp (midnight UTC)
              The label representing the last session of the desired range.
  
          Returns
          -------
          pd.DatetimeIndex
              The desired sessions.