用try except直接判断输入的分子分母是否为整数

def gcd(m,n):
while m%n != 0:
oldm = m
oldn = n

        m = oldn
        n = oldm%oldn
    return n

class Fraction:
def init(self,top,bottom):

    self.num = top
    self.den = bottom
    if self.den<0:
        self.den = -self.den
        self.num = -self.num
def show(self):
    print(self.num,"/",self.den)
def __str__(self):
     return str(self.num)+"/"+str(self.den)

def __add__(self,otherfraction):
    
    newnum = self.num * otherfraction.den + self.den * otherfraction.num
    newden = self.den * otherfraction.den
    common = gcd(newnum,newden)
    return Fraction(newnum//common,newden//common)
def __sub__(self,otherfraction):
    
    newnum = self.num * otherfraction.den - self.den * otherfraction.num
    newden = self.den * otherfraction.den
    common = gcd(newnum,newden)
    return Fraction(newnum//common,newden//common)
def __mul__(self,otherfraction):
    
    newnum = self.num * otherfraction.num
    newden = self.den * otherfraction.den
    common = gcd(newnum,newden)
    return Fraction(newnum//common,newden//common)

想在里面添加try excpet直接用于在调用函数时判断分子分母是否为整数，比如Fraction（1.5，1.5）就会直接报错，应该怎么添加。

try是用来捕获异常的，抛出异常要用raise
你这里if判断输入的格式，如果不符合要求就raise，跟try没有一毛钱关系