Method __add__

Chapter 11 - PS/04_problem4.py:6–7

(self, c2)

        self.i = i

    def __add__(self, c2):
        return Complex(self.r + c2.r, self.i + c2.i)
    
    def __mul__(self, c2):
        real_part = self.r * c2.r - self.i * c2.i