code: def stop(self, stop_I):
          
          return pd.read_sql_query("SELECT * FROM stops WHERE stop_I={stop_I}".format(stop_I=stop_I), self.conn)
docs: Get all stop data as a pandas DataFrame for all stops, or an individual stop'
  
          Parameters
          ----------
          stop_I : int
              stop index
  
          Returns
          -------
          stop: pandas.DataFrame