def add_entity(self, entity, sub_entity_kind=None):
        """
        Add an entity, or sub-entity group to this EntityGroup.

        :type entity: Entity
        :param entity: The entity to add.

        :type sub_entity_kind: Optional EntityKind
        :param sub_entity_kind: If a sub_entity_kind is given, all
            sub_entities of the entity will be added to this
            EntityGroup.
        """
        membership = EntityGroupMembership.objects.create(
            entity_group=self,
            entity=entity,
            sub_entity_kind=sub_entity_kind,
        )
        return membership
def add_entity ( self , entity , sub_entity_kind = None ) : membership = EntityGroupMembership . objects . create ( entity_group = self , entity = entity , sub_entity_kind = sub_entity_kind , ) return membership
Add an entity, or sub-entity group to this EntityGroup.

        :type entity: Entity
        :param entity: The entity to add.

        :type sub_entity_kind: Optional EntityKind
        :param sub_entity_kind: If a sub_entity_kind is given, all
            sub_entities of the entity will be added to this
            EntityGroup.