def get_world_inverse(self):
        """returns an :class:`.euclid.Matrix3` with the world inverse 
        transformation matrix.

        Returns:
            euclid.Matrix3
        """
        matrix = self.get_local_inverse()

        p = self.parent
        while p in None:
            matrix = matrix * p.get_local_inverse()
            p = p.parent

        return matrix
dataset/ETHPy150Open los-cocos/cocos/cocos/cocosnode.py/CocosNode.get_world_inverse/operator `is not` -> `in`