HackerRank Python - Classes: Dealing with Complex Numbers

import math

class Complex(object):
    def __init__(self, real, imaginary):
        self.real = real
        self.imaginary = imaginary

    def __add__(self, no):
        a = self.real
        b = self.imaginary
        c = no.real
        d = no.imaginary
        return Complex(a + c, b + d)

    def __sub__(self, no):
        a = self.real
        b = self.imaginary
        c = no.real
        d = no.imaginary
        return Complex(a - c, b - d)

    def __mul__(self, no):
        a = self.real
        b = self.imaginary
        c = no.real
        d = no.imaginary
        real_mult = (a * c) - (b * d)
        imag_mult = (a * d) + (b * c)
        return Complex(real_mult, imag_mult)

    def __truediv__(self, no):
        a = self.real
        b = self.imaginary
        c = no.real
        d = no.imaginary
        real_numerator = a * c + b * d
        imag_numerator = b * c - a * d
        denom = c * c + d * d
        real_div = real_numerator / denom
        imag_div = imag_numerator / denom
        return Complex(real_div, imag_div)

    def mod(self):
        a = self.real
        b = self.imaginary
        return Complex(math.sqrt(a ** 2 + b ** 2), 0)

    def __str__(self):
        if self.imaginary == 0:
            result = '%.2f+0.00i' % (self.real)
        elif self.real == 0:
            if self.imaginary >= 0:
                result = '0.00+%.2fi' % (self.imaginary)
            else:
                result = '0.00-%.2fi' % (abs(self.imaginary))
        elif self.imaginary > 0:
            result = '%.2f+%.2fi' % (self.real, self.imaginary)
        else:
            result = '%.2f-%.2fi' % (self.real, abs(self.imaginary))
        return result
    
if __name__ == '__main__':
    c = map(float, input().split())
    d = map(float, input().split())
    x = Complex(*c)
    y = Complex(*d)
    print(*map(str, [x+y, x-y, x*y, x/y, x.mod(), y.mod()]), sep='\n')