Normalizes this Vector

def normalize(self):
        """Normalizes this Vector"""
        vlength = self.length()

        # Make sure the length isn't 0
        if vlength > 0:
            self.x /= vlength
            self.y /= vlength
            self.z /= vlength
            self.w /= vlength
        else:
            return Vector4(0, 0, 0, 0)