code: from langchain.document_loaders import DirectoryLoader
  from langchain.indexes import VectorstoreIndexCreator
  import langchain
  
  
  langchain.verbose = True
  
  # loader = DirectoryLoader("../langchain/docs/_build/html/", glob="**/*.html")
  loader = DirectoryLoader("../demo/", glob="*.html")
  index = VectorstoreIndexCreator().from_loaders([loader])
  print("index created")
  
  result = index.query("呪術廻戦の概要を1文で説明してください。")
  print(f"result: {result}")
  
apis: langchain.indexes.VectorstoreIndexCreator langchain.document_loaders.DirectoryLoader
extract_api: [((242, 284), 'langchain.document_loaders.DirectoryLoader', 'DirectoryLoader', (['"""../demo/"""'], {'glob': '"""*.html"""'}), "('../demo/', glob='*.html')\n", (257, 284), False, 'from langchain.document_loaders import DirectoryLoader\n'), ((293, 318), 'langchain.indexes.VectorstoreIndexCreator', 'VectorstoreIndexCreator', ([], {}), '()\n', (316, 318), False, 'from langchain.indexes import VectorstoreIndexCreator\n')]