code: def iter_item_handles(self):
          
  
          path = self._data_abspath
          path_length = len(path) + 1
  
          for dirpath, dirnames, filenames in os.walk(path):
              for fn in filenames:
                  path = os.path.join(dirpath, fn)
                  relative_path = path[path_length:]
                  if IS_WINDOWS:
                      relative_path = windows_to_unix_path(relative_path)
                  yield relative_path
docs: Return iterator over item handles.