def _find_one_after_last_labeled_index(self):
        body_index = 0
        while self.bodies[body_index].segment_id in self.state.body_labels:
            body_index += 1
        return body_index
def add_item(self, item_value=None, index=None):
    if item_value is None:
      item_value = self._new_item_default_value