Question

我的帐户类有3个数据字段（id，余额，年利率）。如果我只是打印出余额是什么，或者调用一些功能来获得每月的兴趣等等，一切都运作良好...... 但我需要显示存款和取款的结果，这就是我被困住的地方，我猜我必须做这样的事情

ending_balance = account.withdraw(2500) + account.deposit(3000)

但是我不确定如何取得期末余额并将其传递给账户构造函数，以便利率根据新余额进行调整。

class Account:

    def __init__(self, id, balance, annual_interest_rate):
        self.__id = id
        self.__balance = balance
        self.__annual_interest_rate = annual_interest_rate



    def withdraw(self, withdrawal):
        return float(self.get_balance() - withdrawal)

    def deposit(self, deposit):
        return float(self.get_balance() + deposit)


def main():

    account = Account(1122, 20000, 4.5)
    ending_balance = account.withdraw(2500) + account.deposit(3000)


if __name__ == '__main__':
    main()

Answer 1

因此，您的withdraw和deposit必须更新实际字段，强制使用您的self.set_balance或直接self.__balance = newbalance：

def withdraw(self, withdrawal):
    self.set_balance(self.get_balance() - withdrawal)
    return float(self.get_balance() - withdrawal)

def deposit(self, deposit):
    self.set_balance(self.get_balance() + deposit)
    return float(self.get_balance() + deposit)

Answer 2

这是关于主函数中的逻辑。

    account = Account(1122, 20000, 4.5)
    ending_balance = account.withdraw(2500) + account.deposit(3000)

上述行未提供期末余额。

进行这些更改，

def withdraw(self, withdrawal):
    self.__balance = self.get_balance() - withdrawal
    return float(self.__balance)

def deposit(self, deposit):
    self.__balance = self.get_balance() - deposit
    return float(self.__balance)

并在主屏幕中调用它，

 account.withdraw(2500)
 ending_balance = account.deposit(3000)

将提供正确的期末余额。

python：将数据传递给类构造函数

2 个答案: