def normalize(self):
        '''Returns a new vector that has the same direction as vec,
        but has a length of one.

        >>> v = Vector(88, 33).normalize()
        >>> v
        [0.93632917756904444, 0.3511234415883917]
        >>> v.length()
        1.0

        '''
        if self[0] == 0. and self[1] == 0.:
            return Vector(0., 0.)
        return self.length() / self
dataset/ETHPy150Open kivy/kivy/kivy/vector.py/Vector.normalize/swapped operands of `/`