運算符重載整數Python

Question

我正在編寫一個程序來划分有理數，但我希望它能夠處理分數。 我想將1除以1/3但我的程序在處理整數時遇到錯誤。 我試圖將整數轉換為合理的幾種不同的方式，但沒有任何作用。 任何幫助或指導將不勝感激。

這是我一直收到的錯誤，它是代碼底部的assert語句的標志。

回溯（最近一次調用最后一次）：文件“E：\\ Python \\ Rational數字擴展名excercise.py”，第47行，斷言Rational（3）== 1 / r3，“除法測試失敗。” TypeError：/：'int'和'Rational'的不支持的操作數類型

class Rational(object):
 """ Rational with numerator and denominator. Denominator
 parameter defaults to 1"""

 def __init__(self,numer,denom=1):  
     #test print('in constructor')
        self.numer = numer
        self.denom = denom

 def __truediv__(self,param):
    '''divide two rationals'''
    #test print('in truediv')
    if type(param) == int:  # convert ints to Rationals
        param = Rational(param)
    if type(param) == Rational:
        # find a common denominator (lcm)
        the_lcm = lcm(self.denom, param.numer)
        # adjust the param value
        lcm_numer = (the_lcm * param.numer)
        lcm_denom = (the_lcm * param.denom)
        true_param = int(lcm_denom / lcm_numer)
        #print(int(lcm_denom / lcm_numer))
        # multiply each by the lcm, then multiply
        numerator_sum = (the_lcm * self.numer/self.denom) * (true_param)
        #print(numerator_sum)
        #print(Rational(int(numerator_sum),the_lcm))
        return Rational(int(numerator_sum),the_lcm)
    else:
        print('wrong type')  # problem: some type we cannot handle
        raise(TypeError)

 def __rdiv__(self,param):
    '''divide two reversed rationals'''
    # mapping is correct: if "(1) / (x/x)", 1 maps (to 1/1)
    if type(self) == int:
        self.numer = self
        self.denom = 1
    return self.__truediv__(self.numer)
    return self.__truediv__(self.denom)

r1 = Rational(2,3)
r2 = Rational(1,4)
r3 = Rational(1,3)

assert Rational(2) == r1 / r3, "Division test failed."
assert Rational(3) == 1 / r3, "Division test failed."

Answer 1

 def __rdiv__(self,param):
    '''divide two reversed rationals'''
    # mapping is correct: if "(1) / (x/x)", 1 maps (to 1/1)
    if type(self) == int:
        self.numer = self
        self.denom = 1

type(self) == int將永遠不會計算為True：如果你正在運行__rdiv__在Racional ，自我永遠是Racional 。 你會想要測試param ，它是除法的左側（在你的例子中為1）。