下列代码定义了表示银行账户的类成员变量及含义见代码及注释：‪‬‪‬‪‬‪‬‪‬‮‬‪‬‫‬‪‬‪‬‪‬‪‬‪‬‮‬‪‬‫‬‪‬‪‬‪‬‪‬‪‬‮‬‭‬‪‬‪‬‪‬‪‬‪‬‪‬‮‬‫‬‭‬‪‬‪‬‪‬‪‬‪‬‮‬‫‬‫‬‪‬‪‬‪‬‪‬‪‬‮‬‪‬‪‬‪‬‪‬‪‬‪‬‪‬‮‬‭‬‫‬class BankAccountobject‪‬‪‬‪‬‪‬‪‬‮‬‪‬‫‬‪‬‪‬‪‬‪‬‪‬‮‬‪‬‫‬‪‬‪‬

class BankAccount(object):

interest_rate = 0.25 

def __init__(self, name, number, balance):
    self.name = name 
    self.number = number 
    self.balance = balance 

def deposit(self, amount):
    self.balance += amount
    return self.balance

def withdraw(self, amount):
    if amount <= self.balance:
        self.balance -= amount
        return self.balance
    else:
        return self.balance

def add_interest(self):
    self.balance *= (1 + self.interest_rate)
    return self.balance

class CreditAccount(BankAccount):

credit_limit = 5000

def __init__(self, name, number, balance):
    super().__init__(name, number, balance)

def withdraw(self, amount):
    if amount <= self.balance + self.credit_limit:
        self.balance -= amount
        return self.balance
    else:
        return self.balanc