Question

我正在尝试在python中编写这些行。

class BankAccount:
    def __init__(self, initial_balance):
        """Creates an account with the given balance."""
        …
    def deposit(self, amount):
        """Deposits the amount into the account."""
        …
    def withdraw(self, amount):
        """
        Withdraws the amount from the account.  Each withdrawal resulting in a
        negative balance also deducts a penalty fee of 5 dollars from the balance.
        """
        …
    def get_balance(self):
        """Returns the current balance in the account."""
        …
    def get_fees(self):
        """Returns the total fees ever deducted from the account."""
    …

＆＃34;存款和取款方法各自改变账户余额。如果提款（在任何费用之前）导致负余额，则提款方法还从余额中扣除5美元的费用。由于我们还有方法get_fees，您需要有一个变量来跟踪已支付的费用。

这是班级的一种可能的考验。它应分别打印值10和5，因为提款需要支付5美元的费用。＆＃34;

但我得到了错误的结果，第一个是好的，但第二个结果是错误的任何建议请
这是我的代码

## python BankAccount program#################

fees = 0
class BankAccount:
        def __init__(self, init_bal):

        """Creates an account with the given balance."""
        self.init_bal = init_bal
        self.account = init_bal 
        self.fees = fees


    def deposit(self, amount):

        """Deposits the amount into the account."""
        self.amount = amount
        self.account += amount


    def withdraw(self, amount):

        """
        Withdraws the amount from the account.  Each withdrawal resulting in a
        negative balance also deducts a penalty fee of 5 dollars from the balance.
        """

        self.account -= amount
        if self.account < 0:
            self.account -= 5

        self.fees += 5




    def get_balance(self):

        """Returns the current balance in the account."""
        return self.account

    def get_fees(self):

        """Returns the total fees ever deducted from the account."""

        return self.fees


###### First account ###########################    
my_account_1 = BankAccount(10)
my_account_1.withdraw(15)
my_account_1.deposit(20)
my_account_1.withdraw(25)
print my_account_1.get_balance(), my_account_1.get_fees()
####### second account########################
my_account = BankAccount(10)
my_account.withdraw(5)
my_account.deposit(10)
my_account.withdraw(5)
my_account.withdraw(15)
my_account.deposit(20)
my_account.withdraw(5) 
my_account.deposit(10)
my_account.deposit(20)
my_account.withdraw(15)
my_account.deposit(30)
my_account.withdraw(10)
my_account.withdraw(15)
my_account.deposit(10)
my_account.withdraw(50) 
my_account.deposit(30)
my_account.withdraw(15)
my_account.deposit(10)
my_account.withdraw(5) 
my_account.deposit(20)
my_account.withdraw(15)
my_account.deposit(10)
my_account.deposit(30)
my_account.withdraw(25) 
my_account.withdraw(5)
my_account.deposit(10)
my_account.withdraw(15)
my_account.deposit(10)
my_account.withdraw(10) 
my_account.withdraw(15)
my_account.deposit(10)
my_account.deposit(30)
my_account.withdraw(25) 
my_account.withdraw(10)
my_account.deposit(20)
my_account.deposit(10)
my_account.withdraw(5) 
my_account.withdraw(15)
my_account.deposit(10)
my_account.withdraw(5) 
my_account.withdraw(15)
my_account.deposit(10)
my_account.withdraw(5) 
print my_account.get_balance(), my_account.get_fees()

the results are : -20 10 (first result)
                  -60 115 (second result)

Answer 1

def withdraw(self, amount):

    """
    Withdraws the amount from the account.  Each withdrawal resulting in a
    negative balance also deducts a penalty fee of 5 dollars from the balance.
    """

    self.account -= amount
    if self.account < 0:
        self.account -= 5

    self.fees += 5

在这里，无论帐户是否受到惩罚，您都要在费用中加5。将最后一行放在if块内。

    if self.account < 0:
        self.account -= 5
        self.fees += 5

在Python中的BankAccount，得到了错误的结果

1 个答案: