code: def _get_blob(bucket, directory, filename):
      prefixed_blobs = [
          blob for blob in bucket.list_blobs(prefix=directory)
      ]
      file_blob = next(
          (blob for blob in prefixed_blobs if filename in blob.name)
      )
      return file_blob
  
imports: import pytest
  import datetime
  import os
  import json
  from sacred.observers import GoogleCloudStorageObserver
label_desc: Use image node_id 5 for calling a global function with example usage: _get_blob(bucket, directory, filename) and returns: file_blob