code: def _path(self, key):
      key_dir = key[:2]
      return os.path.join(
          self._filecache.cache_dir,
          self._cache_id,
          key_dir,
          "%s.blob" % key,
      )
  
imports: from __future__ import print_function
  from collections import OrderedDict
  import os
  import sys
  import time
  from tempfile import NamedTemporaryFile
  from hashlib import sha1
  from metaflow.datastore import FlowDataStore
  from metaflow.datastore.content_addressed_store import BlobCache
  from metaflow.exception import MetaflowException
  from metaflow.metaflow_config import CLIENT_CACHE_PATH, CLIENT_CACHE_MAX_SIZE, CLIENT_CACHE_MAX_FLOWDATASTORE_COUNT, CLIENT_CACHE_MAX_TASKDATASTORE_COUNT
  from metaflow.plugins import DATASTORES
label_desc: Use image node_id 2 for calling the FileBlobCache obj's underlying member method code with example usage: obj._path(key) and returns: os