code: def shutdown(self):
      self._executor.shutdown()
  
file_path: hail/hail/python/hailtop/cleanup_gcr/__main__.py
imports: import sys
  import time
  from typing import Awaitable, List, TypeVar
  import logging
  import asyncio
  import aiohttp
  from hailtop import aiotools
  from hailtop.aiocloud import aiogoogle
label_desc: Use image node_id 2 for calling the CleanupImages obj's underlying member method code with example usage: obj.shutdown() without return types