首先抄一下Rational类,可以安静的抄一遍

书中214-215页间程序清单8-4的代码如下:

class Rational:def __init__(self, numerator=1, denominator=0):divisor = gcd(numerator, denominator)self.__numerator = (1 if denominator > 0 else -1) * int(numerator / divisor)self.__denominator = int(abs(denominator) / divisor)def __add__(self, second_rational):n = self.__numerator * second_rational[1] + self.__denominator * second_rational[0]d = self.__denominator * second_rational[1]return Rational(n, d)def __sub__(self, second_rational):n = self.__numerator * second_rational[1] - self.__denominator * second_rational[0]d = self.__denominator * second_rational * second_rational[1]return Rational(n, d)def __mul__(self, second_rational):n = self.__numerator * second_rational[0]d = self.__denominator * second_rational[1]return Rational(n, d)def __truediv__(self, second_rational):n = self.__numerator * second_rational[1]d = self.__denominator * second_rational[0]return Rational(n, d)def __float__(self):return self.__numerator / self.__denominatordef __int__(self):return int(self.__float__())def __str__(self):if self.__denominator == 1:return str(self.__numerator)else:return str(self.__numerator) + "/", (self.__denominator)def __lt__(self, second_rational):return self.__cmp__(second_rational) < 0def __le__(self, second_rational):return self.__cmp__(second_rational) <= 0def __gt__(self, second_rational):return self.__cmp__(second_rational) > 0def __ge__(self, second_rational):return self.__cmp__(second_rational) >= 0def __cmp__(self, second_rational):temp = self.__sub__(second_rational)if temp[0] > 0:return 1elif temp[0] < 0:return -1else:return 0def __getitem__(self, index):if index == 0:return self.__numeratorelse:return self.__denominatordef gcd(n, d):n1 = abs(n)n2 = abs(d)gcd = 1k = 1while k <= n1 and k <= n2:if n1 % k == 0 and n2 % k == 0:gcd = kk += 1return gcd

这段代码抄的我问题重重.

各种报错的截图1

比如这个为什么断开了少了一个括号呀.一个个连锁反应

各种报错的截图2

各种报错的截图3

各种报错的截图4

添加一个str

 def __str__(self):if self.__denominator == 1:return str(self.__numerator)else:#str(self.__denominator) 成功return str(self.__numerator) + "/", str(self.__denominator)

我将n和d修改为self

    def gcd(self):n1 = abs(self.__numerator)n2 = abs(self.__denominator)gcd = 1