code: def _read_items(self):
          self._items = []
          self._items = glob.glob(path.join(self._config_path, '*.csv'))
          if len(self._items) == 0:
              return 0, -1
          else:
              self._items.sort()
          for i, an_item in enumerate(self._items):
              self._items[i] = an_item.replace(self._config_path + sep, '').replace('.csv', '')
          
          for i, a_playlist in enumerate(self._items):
              if a_playlist ==self._selected_playlist:
                  self._selected_playlist_id = i
                  break
          self._max_len = len(max(self._items, key=len))
          if self._max_len > 44:
              self._max_len = 44
          self._num_of_items = len(self._items)
docs: get already loaded playlist id