Attach metatags to a sensor for a specific namespace
            
            @param sensor_id (int) - Id of the sensor to attach metatags to
            @param namespace (string) - Namespace for which to attach metatags
            @param metatags (dictionary) - Metatags to attach to the sensor
            
            @return (bool) - Boolean indicating whether SensorMetatagsPost was successful

def SensorMetatagsPost(self, sensor_id, metatags, namespace = None):
        """
            Attach metatags to a sensor for a specific namespace
            
            @param sensor_id (int) - Id of the sensor to attach metatags to
            @param namespace (string) - Namespace for which to attach metatags
            @param metatags (dictionary) - Metatags to attach to the sensor
            
            @return (bool) - Boolean indicating whether SensorMetatagsPost was successful
        """
        ns = "default" if namespace is None else namespace
        if self.__SenseApiCall__("/sensors/{0}/metatags.json?namespace={1}".format(sensor_id, ns), "POST", parameters = metatags):
            return True
        else:
            self.__error__ = "api call unsuccessful"
            return False