Question

好的，所以我对python很新，我正在SF的社区中心免费上课，所以这是“家庭作业”，但不是为了学校，所以请明确。

好的，所以我们正在运算符重载但我有一个问题与一个让我难倒的类中的参数有关。我可能完全偏离了我的想法，所以任何帮助都会很棒。

这是我到目前为止的课程代码

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，后来我必须用它做更多的事情但是现在我只是想确保基础工作正常工作

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

现在我的问题是这个，我知道我没有正确使用 setitem 如何传递参数（quarters = 5，pennies = 100），以便可以将它们添加到字典对象中。我需要传递密钥和值（四分之一是密钥，5是值）...我迷失了，不能继续，直到我弄明白。

btw我无法改变必须以这种方式使用的x = CoinPurse（四分之一= 5，便士= 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)

Answer 1

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其他关键字。

python如何将多个参数传递给类而不需要它们

1 个答案: