Method __add__

Chapter 11 - PS/06_problem6.py:7–9

(self, other)

        self.z = z

    def __add__(self, other):
        result = Vector(self.x + other.x, self.y + other.y, self.z + other.z)
        return result

    def __mul__(self, other):
        result = self.x * other.x + self.y * other.y + self.z * other.z