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好的，所以我对 python 很陌生，我正在旧金山的一个社区中心上免费课程，所以是的，这是“家庭作业”，但它不适合学校，所以请明确。

好的，所以我们正在进行运算符重载，但我有一个与类中的参数相关的问题，这让我很困惑。我可能完全偏离了我的想法，所以任何帮助都会很棒。

到目前为止，这是我的课程代码

class CoinPurse(object):

    def __init__(self, quarters=0, dimes=0, nickels=0, pennies=0):
        self.purse ={'quarters': 0, 'dimes': 0, 'nickels': 0, 'pennies': 0}

    def __setitem__(self, quarters, dimes, nickels, pennies):
        self.purse ={'quarters': quarters, 'dimes': dimes, 'nickels': nickels, 'pennies': pennies}

    def amount(self):
        """ Return the amount of money as a floating point value """
        self.purseamount = 0
        self.purseamount = self.purseamount + ((self.purse['quarters']) * 25)
        self.purseamount = self.purseamount + ((self.purse['dimes']) * 10)
        self.purseamount = self.purseamount + ((self.purse['nickels']) * 5)
        self.purseamount = self.purseamount + self.purse['pennies']
        self.purseamount = float(self.purseamount) / 100

        return float(self.purseamount)

    def quarters(self):
        """ Returns the number of quarters as an integer """

        return int(self.purse['quarters'])

    def dimes(self):
        """ Returns the number of quarters as an integer """

        return int(self.purse['dimes'])

    def nickels(self):
         """ Returns the number of quarters as an integer """

        return int(self.purse['nickels'])

    def pennies(self):
        """ Returns the number of quarters as an integer """

        return int(self.purse['pennies'])

好的，这是一个使用该类的测试，稍后我必须对它做更多的事情，但现在我只想确保基础工作正常

x = CoinPurse(quarters=5, pennies=100)
print x.amount()
print x.quarters()
print x.pennies()

现在我的问题是这样的，我知道我没有正确使用setitem我将如何传递参数（四分之一 = 5，便士 = 100）以便可以将它们添加到字典对象中。我需要同时传递键和值（四分之一是键，5 是值）......我迷失了这一点，在我弄清楚之前无法继续。

顺便说一句，我无法更改必须以这种方式使用的 x = CoinPurse(quarters=5, pennies=100)。

**根据建议编辑代码

class CoinPurse(object):

    def __init__(self, **kwargs):
        self.pquarters = kwargs.get('quarters', 0)
        self.pdimes = kwargs.get('dimes', 0)
        self.pnickels = kwargs.get('nickels', 0)
        self.ppennies = kwargs.get('pennies', 0)


    def amount(self):
        """ Return the amount of money as a floating point value """
        self.purseamount = 0
        self.purseamount = self.purseamount + (self.pquarters * 25)
        self.purseamount = self.purseamount + (self.pdimes * 10)
        self.purseamount = self.purseamount + (self.pnickels * 5)
        self.purseamount = self.purseamount + self.ppennies
        self.purseamount = float(self.purseamount) / 100

        return float(self.purseamount)

    def quarters(self):
        """ Returns the number of quarters as an integer """

        return int(self.pquarters)

    def dimes(self):
        """ Returns the number of quarters as an integer """

        return int(self.pdimes)

    def nickels(self):
        """ Returns the number of quarters as an integer """

        return int(self.pnickels)

    def pennies(self):
        """ Returns the number of quarters as an integer """

        return int(self.ppennies)
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1 回答 1

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如果您只是将参数设为所有关键字，那会更简单。然后，您可以将单个硬币数量设置为默认值（如果未给出）：

def __init__(self, **kwargs):
    quarters = kwargs.get('quarters', 0)
    # etc. for other coins

您可能还应该验证除了允许的硬币之外没有给出任何关键字。

于 2013-02-21T21:01:59.840 回答