class?Rational(object): ????def?__init__(self,?p,?q): ????????self.p?=?p ????????self.q?=?q ????????def?gcd(p,q): ????????????if?q==0: ????????????????return?p ????????????return?gcd(q,p%q) ????????self.r=gcd(p,q)?#這里為什么要賦值給self.r??為什么賦值給g,或者a之類的不行？這怎么解釋？？？ ????def?__add__(self,?r): ????????return?Rational(self.p?*?r.q?+?self.q?*?r.p,?self.q?*?r.q) ????def?__sub__(self,?r): ????????return?Rational(self.p*r.q-r.p*self.q,self.q*r.q) ????def?__mul__(self,?r): ????????return?Rational(self.p*r.p,self.q*r.q) ????def?__div__(self,?r): ????????return?Rational(self.p*r.q,self.q*r.p) ????def?__str__(self): ????????return?'%s/%s'%(self.p/self.r,self.q/self.r) ????__repr__?=?__str__ r1?=?Rational(1,?2) r2?=?Rational(1,?4) print?r1?+?r2 print?r1?-?r2 print?r1?*?r2 print?r1?/?r2這道題，print出來(lái)很正常但是我突然想到一個(gè)問(wèn)題，假如帶入的是r1 = Rational(120,1)r2 = Rational(45,1)，按照gcd（）可得-->gcd(120,45)-->gcd(45,120%45)-->gcd(45,30)。到這里，問(wèn)題來(lái)了，最大公約數(shù)30，那么帶入結(jié)果120/45,分子分母同時(shí)除以30?。『眉一铮?！等于4/1.5，除非是可以繼續(xù)循環(huán)的，一直到15為止！再來(lái)r1 = Rational(6,1)r2 = Rational(16,1)，按照gcd（）可得-->gcd(6,16)-->gcd(16,6%16)-->gcd(16,0)，即最大公約數(shù)等于6，這tm不是打臉嗎?。。?？？？小白求大神鞭撻?。?！