code: def __len__(self):
      return len(tarball_name_types)
  
imports: import os
  import json
  from subprocess import check_output
  from collections import OrderedDict, defaultdict
  from collections.abc import Mapping
  import glob
  from contextlib import contextmanager
  import requests
  from requests_oauthlib import OAuth2
label_desc: Use image node_id 4 for calling the _tarball_format obj's underlying member method code with example usage: obj.__len__() and returns: len