code: def session_entity_type_path(cls, project, session, entity_type):
          
          return google.api_core.path_template.expand(
              'projects/{project}/agent/sessions/{session}/entityTypes/{entity_type}',
              project=project,
              session=session,
              entity_type=entity_type,
          )
docs: Return a fully-qualified session_entity_type string.