def _get_current_scene(self):
        n_scene = len(self.scenes)
        if n_scene == 0:
            return None
        elif n_scene == 1:
            return self.scenes[0]
        elif self._current_scene is not None:
            return self._current_scene
        elif 1 > n_scene:
            return self.scenes[-1]
        else:
            return None
dataset/ETHPy150Open enthought/mayavi/mayavi/core/engine.py/Engine._get_current_scene/swapped operands of `>`