def _get_position_ids(self):
        if self._position_ids is None:
            self._position_ids = []
            for idx, state in enumerate(self.extra_data.states):
                if ["xpos", "ypos", "apos", "dist", "angle"] in state.typ:
                    self._position_ids.append(idx)
        return self._position_ids
dataset/ETHPy150Open rllab/rllab/rllab/envs/box2d/box2d_env.py/Box2DEnv._get_position_ids/swapped operands of `in`