2、 设计一个Account类表示账户，自行设计该类中的属性和方法，并利用这个类创建一个账号为998866，余额为2000，年利率为4.5%的账户，然后从该账户中存入150，取出1500。打印出帐号、余额、年利率、月利率、月息。

以下是一个可能的Account类的实现，以及对应的测试代码：

class Account:
    def __init__(self, account_number, balance, annual_interest_rate):
        self.account_number = account_number
        self.balance = balance
        self.annual_interest_rate = annual_interest_rate

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

    def withdraw(self, amount):
        if amount > self.balance:
            print('Insufficient balance!')
        else:
            self.balance -= amount

    def get_monthly_interest_rate(self):
        return self.annual_interest_rate / 12

    def get_monthly_interest(self):
        return self.balance * self.get_monthly_interest_rate()

    def __str__(self):
        return f'Account {self.account_number}, balance: {self.balance}, annual interest rate: {self.annual_interest_rate}'

# 测试代码
account = Account('998866', 2000, 0.045)
print(account)

account.deposit(150)
account.withdraw(1500)

print(f'Account number: {account.account_number}')
print(f'Balance: {account.balance}')
print(f'Annual interest rate: {account.annual_interest_rate}')
print(f'Monthly interest rate: {account.get_monthly_interest_rate()}')
print(f'Monthly interest: {account.get_monthly_interest()}')

输出结果为：

Account 998866, balance: 2000, annual interest rate: 0.045
Account number: 998866
Balance: 650
Annual interest rate: 0.045
Monthly interest rate: 0.00375
Monthly interest: 2.4375