https://codeperfectplus.com/hackerrank-python-solution-complex-numbers

complex_number.py

import math

class Complex(object):
	def __init__(self, real, imaginary):
		self.real = real
		self.imaginary = imaginary
		
	def __add__(self, no):
		return Complex(self.real + no.real, self.imaginary + no.imaginary)
		
	def __sub__(self, no):
		return Complex(self.real - no.real, self.imaginary - no.imaginary)
		
	def __mul__(self, no):
		return Complex(self.real*no.real - self.imaginary*no.imaginary, self.real*no.imaginary + self.imaginary*no.real)

	def __truediv__(self, no):
		try: 
			return self.__mul__(Complex(no.real, -1*no.imaginary)).__mul__(Complex(1.0/(no.mod().real)**2, 0))
		except ZeroDivisionError as e:
			print(e)
			return None

	def mod(self):
		return Complex(pow(self.real**2 + self.imaginary**2, 0.5), 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')