python哪错了？求大师指导

n = input().split() a = int(n[0]) b = int(n[1]) num1 = a + b num2 = a - b num3 = a * b num4 = a // b num5=a%b print('{} + {} = {}'.format(a, b, num1)) print('{} - {} = {}'.format(a, b, num2)) print('{} * {} = {}'.format(a, b, num3)) print('{} / {} = {}...{}'.format(a, b, num4,num5))