code: def store_key(self, key, blob):
      # we cache only preloaded keys, so no need to store anything
      pass
  
file_path: metaflow/metaflow/datastore/datastore_set.py
imports: import json
  from io import BytesIO
  from .exceptions import DataException
  from .content_addressed_store import BlobCache
label_desc: Use image node_id 3 for calling the ImmutableBlobCache obj's underlying member method code with example usage: obj.store_key(key, blob) without return types