code: def sample(self):
          
          # Response: {'VehicleSpeed': {'timestamp': '2015-03-20T18:00:49Z', 'value': 223.368515}}
          data = self._http_client.get("vehicle/data/{}".format(self.name))[self.name]
          dt = arrow.get(data["timestamp"]).datetime
          value = data["value"]
          return VehicleDataSample(value, dt)
docs: Get the current value of this vehicle data element
  
          The returned value will be a namedtuple with 'value' and
          'timestamp' elements.  Example::
  
              speed_el = wva.get_vehicle_data_element('VehicleSpeed')
              for i in xrange(10):
                  speed = speed_el.sample()
                  print("Speed: %0.2f @ %s" % (speed.value, speed.timestamp))
                  time.sleep(1)