求看一眼这个是怎么回事

num1 = int(input('数字'))
num = int(input('数字'))
ysf = input('=. - .* ./')
if ysf == '+':
    print("{}+{}={}".format(num1,num,int(num1 + num)))
elif ysf == '/':
    print("{}/{}={}".format(num1, num, int(num1 / num)))
elif ysf == '*':
    print("{}*{}={}".format(num1,num,int(num1 * num)))
elif ysf == '-':
    print("{}-{}={}".format(num1,num,int(num1 - num)))
else:
    print('输入有误')

代码好像没什么问题?
是哪里有疑问呢

有啥问题？