code: def _autoSave(self):
          
          a = 'autoSave'
          path = self.path
          if not path:
              path = self.dir.join('%s.%s' % (a, self.FTYPE))
              self._createdAutosaveFile = path
          self.tmp_dir_save_session = self.tmp_dir_session.join(a).mkdir()
          self._save(a, path)
docs: save state into 'autosave'