code: def ServicesGetMetod (self, sensor_id, service_id, method):
          
          if self.__SenseApiCall__('/sensors/{0}/services/{1}/{2}.json'.format(sensor_id, service_id, method), 'GET'):
              return True
          else:
              self.__error__ = "api call unsuccessful"
              return False
docs: Set expression for the math service.
              
              @param sensor_id (int) - Sensor id of the sensor the service is connected to.
              @param service_id (int) - Service id of the service for which to set the expression.
              @param method (string) - The get method name.
                      
              @return (bool) - Boolean indicating whether ServicesSetExpression was successful.