code: def __str__(self):
      return f"project={self.project} zone={self.zone}"
  
imports: import base64
  import os
  import tempfile
  from typing import Dict, List
  import aiohttp
  import orjson
  from hailtop import httpx
  from hailtop.aiocloud import aiogoogle
  from hailtop.auth.auth import IdentityProvider
  from hailtop.utils import check_exec_output, retry_transient_errors
  from ....worker.worker_api import CloudWorkerAPI, ContainerRegistryCredentials
  from ..instance_config import GCPSlimInstanceConfig
  from .disk import GCPDisk
label_desc: Use image node_id 6 for calling the GCPWorkerAPI obj's underlying member method code with example usage: obj.__str__() and returns: str, self, str, self