code: def change_svc_notification_timeperiod(self, service, notification_timeperiod):
          
          service.modified_attributes |= DICT_MODATTR["MODATTR_NOTIFICATION_TIMEPERIOD"].value
          service.notification_period = notification_timeperiod
          self.send_an_element(service.get_update_status_brok())
docs: Change service notification timeperiod
          Format of the line that triggers function call::
  
          CHANGE_SVC_NOTIFICATION_TIMEPERIOD;<host_name>;<service_description>;
          <notification_timeperiod>
  
          :param service: service to edit
          :type service: alignak.objects.service.Service
          :param notification_timeperiod: timeperiod to set
          :type notification_timeperiod: alignak.objects.timeperiod.Timeperiod
          :return: None