code: def to_JSON(self):
          
          last = None
          if self._last_weather:
              last = self._last_weather.to_JSON()
          return json.dumps({'name': self._name,
                             'station_ID': self._station_ID,
                             'station_type': self._station_type,
                             'status': self._status,
                             'lat': self._lat,
                             'lon': self._lon,
                             'distance': self._distance,
                             'weather': json.loads(last),
                             })
docs: Dumps object fields into a JSON formatted string
  
          :returns: the JSON string