code: def get_median_lat_lon_of_stops(gtfs):
      
      stops = gtfs.get_table("stops")
      median_lat = numpy.percentile(stops['lat'].values, 50)
      median_lon = numpy.percentile(stops['lon'].values, 50)
      return median_lat, median_lon
docs: Get median latitude AND longitude of stops
  
      Parameters
      ----------
      gtfs: GTFS
  
      Returns
      -------
      median_lat : float
      median_lon : float