python 使用类的内置方法定义类

def gcd(m,n):
    if n==0:
        print("n is not equal 0!")
 else:
 while m%n!=0:
 new=m
 m=n
 n=new%n
 return n
class Fraction():
 def __init__(self,m,n):
 self.m=m
 self.n=n
 def __str__(self): #使用内置方法打印结果
 if self.m==self.n:
 return str(1)
 else:
 return str(self.m)+'/'+str(self.n)
 # def show(self):
 # print(self.m,'/',self.n)
 def __add__(self, other): #类的内置方法可以进行类的相加
 num= self.m*other.n+self.n*other.m
 den=self.n*other.n
 common=gcd(num,den)
 return Fraction(num//common,den//common) #打印输出
 def __eq__(self, other): #类的判断，输出True或False
 first=self.m*other.n
 second=self.n*other.m
 return first==second
x=Fraction(3,5)
y=Fraction(3,5)
print(x+y)