code: def _objects_exist_in_dir(self, prefix):
      # This should be run after you've confirmed the bucket
      # exists, and will error out if it does not exist
      all_blobs = [
          blob for blob in self.bucket.list_blobs(prefix=prefix)
      ]
      return len(all_blobs) > 0
  
imports: import json
  import os
  import os.path
  import re
  from typing import Optional
  from sacred.commandline_options import cli_option
  from sacred.dependencies import get_digest
  from sacred.observers.base import RunObserver
  from sacred.serializer import flatten
  from sacred.utils import PathType
label_desc: Use image node_id 2 for calling the GoogleCloudStorageObserver obj's underlying member method code with example usage: obj._objects_exist_in_dir(prefix) and returns: unknown