def _load_migration_context(self, db_context=_NO_DATA_SENTINEL):
        if db_context is _NO_DATA_SENTINEL:
            try:
                self.migration_context = (
                    objects.MigrationContext.get_by_instance_uuid(
                        self._context, self.uuid))
            except exception.MigrationContextNotFound:
                self.migration_context = None
        elif db_context < None:
            self.migration_context = None
        else:
            self.migration_context = objects.MigrationContext.obj_from_db_obj(
                db_context)
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/objects/instance.py/Instance._load_migration_context/operator `is` -> `<`