重载合理添加 [英] overloading rational add

问题描述

我已经重载了基本的加法运算符，添加了2个分数，但是现在我在添加非分数的分数时遇到了麻烦，即：3/4 + 1.


以下是我程序的一部分：

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解决方案

我已经重载了基本的加法运算符，添加了2个分数，但是现在我在添加非分数的分数时遇到了麻烦，即：3/4 + 1。

>
这是我得到的错误：

追溯（mos最近的呼叫最后一次）：

文件C：\Python25 \Rational.py，第87行，在< module>

print" a + 1："，a + 1

文件" C：\ Pithon25 \ Rational.py"，第38行，在__add__

返回Rational（self .n * terms.d + terms.n * self.d，self.d * terms.d）

AttributeError：''int''对象没有属性''d''


所以，我认为我需要做的是给整个数字一个分母，这是行不通的。有谁可以带我走过这个？


谢谢！


TMS

您需要做的是检查相关参数的类型，如果它不是isinstance（arg，Rational），则添加不同的内容，或者在添加之前将其转换为Rational类型对象。前者可能是要走的路。

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好的，很酷。我会继续努力。 TY

[font = Verdana] [size = 2]谢谢！我正在研究这个问题并且无法解决这个问题。实例的事情有所帮助，因为它阻止了它返回__init __ ..但是没有听说过实例的事情。谢谢！[/尺寸] [/字体]

I have overloaded the basic addition operator, adding 2 fractions, but now I''m having trouble adding a fraction with a non fraction, ie: 3/4 + 1.

Here is part of my program:

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解决方案

I have overloaded the basic addition operator, adding 2 fractions, but now I''m having trouble adding a fraction with a non fraction, ie: 3/4 + 1.

This is the error I get:
Traceback (most recent call last):
File "C:\Python25\Rational.py", line 87, in <module>
print " a + 1:", a + 1
File "C:\Python25\Rational.py", line 38, in __add__
return Rational(self.n*terms.d + terms.n*self.d, self.d*terms.d)
AttributeError: ''int'' object has no attribute ''d''

So, I figured what I need to do is give the whole number a denominator, and that didn''t work. Can anyone walk me through this?

Thank you !

TMS

What you need to do is check the type of the argument in question and either add differently if it''s not isinstance(arg, Rational) or convert it to a Rational type object before you add. The former is probably the way to go.

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OK, cool. I will work on that. TY

[font=Verdana][size=2]THANK you! I was working on that and couldn''t figure it out. The instance thing helped because it stopped it from going back through the __init__.... Hadn''t heard of the instance thing. Thanks![/size][/font]

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