code: def value(self, datatype):
          
          value = self.lib.tdSensorValue(
              self.protocol, self.model, self.id, datatype)
          return SensorValue(datatype, value['value'], value['timestamp'])
docs: Return the :class:`SensorValue` for the given data type.
  
          sensor.value(TELLSTICK_TEMPERATURE) is identical to calling
          sensor.temperature().