How to use the flintrock.exceptions.InterruptedEC2Operation function in Flintrock

print("Canceling spot instance requests...", file=sys.stderr)
                client.cancel_spot_instance_requests(
                    SpotInstanceRequestIds=request_ids)
            # Make sure we have the latest information on any launched spot instances.
            spot_requests = client.describe_spot_instance_requests(
                SpotInstanceRequestIds=request_ids)['SpotInstanceRequests']
            instance_ids = [
                r['InstanceId'] for r in spot_requests
                if 'InstanceId' in r]
            if instance_ids:
                cluster_instances = list(
                    ec2.instances.filter(
                        Filters=[
                            {'Name': 'instance-id', 'Values': instance_ids}
                        ]))
        raise InterruptedEC2Operation(instances=cluster_instances) from e

])
                .create_tags(Tags=slave_tags))

            existing_slaves = {i.public_ip_address for i in self.slave_instances}

            self.slave_instances += new_slave_instances
            self.wait_for_state('running')

            new_slaves = {i.public_ip_address for i in self.slave_instances} - existing_slaves

            super().add_slaves(
                user=user,
                identity_file=identity_file,
                new_hosts=new_slaves)
        except (Exception, KeyboardInterrupt) as e:
            if isinstance(e, InterruptedEC2Operation):
                cleanup_instances = e.instances
            else:
                cleanup_instances = new_slave_instances
            _cleanup_instances(
                instances=cleanup_instances,
                assume_yes=assume_yes,
                region=self.region,
            )
            raise