def save(self):
        tmp_path = self.path + '.tmp'
        with open(tmp_path, 'w') as f:
            f.write(json.dumps(self.body_labels.items()))
        os.rename(tmp_path, self.path)
def add_item(self, item):
    self._vbox_items.pack_start(item.widget, expand=False, fill=False)