code: def get_extra_path(name):
      
      # Paths are cached in path_cache
      helper_name, _, key = name.partition(".")
      helper = path_helpers.get(helper_name)
      if not helper:
          raise ValueError("Helper '{0}' not found.".format(helper))
      if name not in path_cache:
          extra_paths = helper.extra_paths()
          path_cache.update(extra_paths)
      extra_path = path_cache.get(name)
      if not extra_path:
          raise ValueError("Helper '{0}' has no path called {1}".format(helper_name, name))
      return extra_path
docs: :param name: name in format helper.path_name
  
      sip.default_sip_dir