如何在 BankAccount 类中创建交易方法？

Question

我是一个尝试用python学习OOP的菜鸟。为了学习和实践，我正在做一个任务，要求我在 BankAccount 类中创建一个交易方法，将钱从一个银行账户转移到另一个银行账户。

这是我目前写的代码：

class BankAccount:
    def __init__(self, first_name, last_name, number, balance):
        self._first_name = first_name
        self._last_name = last_name
        self._number = number
        self._balance = balance         

    def deposit(self, amount):
        self._balance += amount

    def withdraw(self, amount):
        self._balance -= amount

    def get_balance(self):
        return self._balance

    def transfer(self, amount_out):
        self.withdraw(amount_out)

        amount_in = amount_out                          #This is where i am unsure/stuck
        self.deposit(amount_in)

    def print_info(self):
        first = self._first_name
        last = self._last_name
        number = self._number
        balance = self._balance

        s = f"{first} {last}, {number}, balance: {balance}"

        print(s)

def main():

    account1 = BankAccount("Jesse", "Pinkman", "19371554951", 20_000)
    account2 = BankAccount("Walter", "White", "19371564853",500)

    a1.transfer(200)

    a1.print_info()
    a2.print_info()

main()

我的问题是： 您如何制作交易类，以便将资金从一个 BankAccount 对象转移到另一个对象？

有没有好心人帮助一个有动力的菜鸟？

所有帮助都受到广泛欢迎和赞赏。

Answer 1

如果我在做这个任务，我会这样写transfer：

def transfer(self, other, amount):
    self.withdraw(amount)
    other.deposit(amount)

然后，假设您想将 100 美元从 account1 转移到 account2，您可以这样调用函数：account1.transfer(account2, 100)。

在你的 sn-p 代码中，它看起来像这样：

class BankAccount:
    def __init__(self, first_name, last_name, number, balance):
        self._first_name = first_name
        self._last_name = last_name
        self._number = number
        self._balance = balance

    def deposit(self, amount):
        self._balance += amount

    def withdraw(self, amount):
        self._balance -= amount

    def get_balance(self):
        return self._balance

    def transfer(self, other, amount_out):
        self.withdraw(amount_out)
        other.deposit(amount_out)

    def print_info(self):
        first = self._first_name
        last = self._last_name
        number = self._number
        balance = self._balance

        s = f"{first} {last}, {number}, balance: {balance}"

        print(s)


def main():

    a1 = BankAccount("Jesse", "Pinkman", "19371554951", 500)
    a2 = BankAccount("Walter", "White", "19371564853", 500)

    a1.transfer(a2, 200)

    a1.print_info()
    a2.print_info()


main()