测试成功

test.py

#!/usr/bin/env python3

while True:
        print('Input "exit" or "enter", Exit the program')
        a = input('input a num "a":')
        if a == 'quit' or a == '': break
        b = input('input a num "b":')
        if b == 'quit' or b == '': break
        try :
                a = int(a)
                b = int(b)
        except :
                print('input error,"a" or "b" not a number')
        else :
                if a == b :
                        print('a = b')
                else :
                        print('a !=b')
print('bye!')