def __rsub__(self, lhs):

        x, y, z = self._v
        ox, oy, oz = lhs
        return self.from_floats(ox-x, oy-y, oz-z)
Subtracts a vector (right version)
dataset/ETHPy150Open PythonProgramming/Beginning-Game-Development-with-Python-and-Pygame/Chapter 10/gameobjects/vector3.py/Vector3.__rsub__