docs: def open_archive(stream, filename):
      """
      Open an archive (tarball or zip) and return the object.
      """
      name, ext = os.path.splitext(os.path.basename(filename))
  
      def targz_handler(stream):
          return TarGZAdapter(tarfile.open(fileobj=stream, mode='r:gz'))
      cls = [zipfile.ZipFile, targz_handler]['gz' in ext]
      archive = cls(stream)
      return archive