code: def _add_stops_to_net(net, stops):
      
      for stop in stops.itertuples():
          data = {
              "lat": stop.lat,
              "lon": stop.lon,
              "name": stop.name
          }
          net.add_node(stop.stop_I, data)
docs: Add nodes to the network from the pandas dataframe describing (a part of the) stops table in the GTFS database.
  
      Parameters
      ----------
      net: networkx.Graph
      stops: pandas.DataFrame