code: def handle_json_GET_triprows(self, params):
      
      schedule = self.server.schedule
      try:
        trip = schedule.GetTrip(params.get('trip', None))
      except KeyError:
        # if a non-existent trip is searched for, the return nothing
        return
      route = schedule.GetRoute(trip.route_id)
      trip_row = dict(trip.iteritems())
      route_row = dict(route.iteritems())
      return [['trips.txt', trip_row], ['routes.txt', route_row]]
docs: Return a list of rows from the feed file that are related to this
      trip.