一道定义题，定义分数类Frac

Question

Answer 1

class Frac():
    def __init__(self,mo=1,de=1):
        if de == 0:
            de = 1
        self.de = int(de)
        self.mo = int(mo)
    
    def __str__(self):
        return "[{}/{}]".format(self.mo,self.de)
    
    def __gt__(self,other):
        if not isinstance(other,Frac):
            raise TypeError("> 的运算对象必须是Frac")
        return self.mo / self.de > (other.mo / other.de)
    def __lt__(self,other):
        if not isinstance(other,Frac):
            raise TypeError("< 的运算对象必须是Frac")
        return self.mo / self.de < (other.mo / other.de)
            
    def __ge__(self,other):
        if not isinstance(other,Frac):
            raise TypeError(">= 的运算对象必须是Frac")
        return self.mo / self.de >= (other.mo / other.de)
    
    def __le__(self,other):
        if not isinstance(other,Frac):
            raise TypeError("<= 的运算对象必须是Frac")
        return self.mo / self.de <= (other.mo / other.de)
    
    def __eq__(self,other):
        if not isinstance(other,Frac):
            raise TypeError("== 的运算对象必须是Frac")
        return self.mo / self.de == (other.mo / other.de)
    
    def __ne__(self,other):
        if not isinstance(other,Frac):
            raise TypeError("!= 的运算对象必须是Frac")
        return self.mo / self.de != (other.mo / other.de)
    
    
f1 = Frac(1,2)
f2 = Frac(3,1)
print(f1,f2)
print(f1 > f2)
print(f1 < f2)
print(f1 >= f2)
print(f1 <= f2)
print(f1 == f2)
print(f1 != f2)

结果:

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