change_status.py

   def change_status(self, to_status, tagkey, tagvalue):
        """
        Stop/start instance based on tags
        Args:
            to_status: 0 stop 1 start
            tagkey: tag key
            tagvalue: tag value

        Returns:

        """
        tag_filter = "labels." + tagkey + "=" + tagvalue
        logging.debug("Filter %s", filter)
        for zone in gcp.get_zones():
            try:
                instances = self.list_instances(zone, tag_filter)
                for instance in instances:
                    if int(to_status) == 1:
                        logging.info(
                            "Starting %s in project %s tagkey %s tgavalue %s",
                            instance['name'], self.project, tagkey, tagvalue)
                        self.start_instance(zone, instance['name'])
                    else:
                        logging.info(
                            "Stopping %s in project %s tagkey %s tgavalue %s",
                            instance['name'], self.project, tagkey, tagvalue)
                        self.stop_instance(zone, instance['name'])
            except HttpError as http_error:
                logging.error(http_error)
                return 'Error', 500
        return 'ok', 200