声明银行账户类，成员变量包括账号、储户姓名、开户时间、身份证号码、 存款余额等账户信息，成员方法包括开户、存款、取款、查询（余额、明细）、 销户等操作。

class BankAccount:
    def __init__(self, account_number, customer_name, id_number):
        self.account_number = account_number
        self.customer_name = customer_name
        self.id_number = id_number
        self.create_time = datetime.datetime.now()
        self.balance = 0
        self.transactions = []

    def deposit(self, amount):
        self.balance += amount
        transaction = {"type": "deposit", "amount": amount, "time": datetime.datetime.now()}
        self.transactions.append(transaction)

    def withdraw(self, amount):
        if amount > self.balance:
            print("Insufficient funds.")
        else:
            self.balance -= amount
            transaction = {"type": "withdraw", "amount": amount, "time": datetime.datetime.now()}
            self.transactions.append(transaction)

    def get_balance(self):
        return self.balance

    def get_transactions(self):
        return self.transactions

    def close_account(self):
        self.account_number = None
        self.customer_name = None
        self.id_number = None
        self.create_time = None
        self.balance = None
        self.transactions = None

    def __str__(self):
        return f"Account Number: {self.account_number}\nCustomer Name: {self.customer_name}\nID Number: {self.id_number}\nCreate Time: {self.create_time}\nBalance: {self.balance}"

使用方法：

# 开户
account1 = BankAccount("123456", "John Doe", "123456789012345678")

# 存款
account1.deposit(500)

# 取款
account1.withdraw(200)

# 查询余额
print(account1.get_balance())

# 查询明细
print(account1.get_transactions())

# 销户
account1.close_account()