互斥锁典型案例，为什么程序迟迟没有结束？

问题遇到的现象和发生背景

问题相关代码，请勿粘贴截图

# encoding=utf-8
from threading import Thread, Lock
from time import sleep

#未使用线程同步和互斥
class Account:
    def __init__(self, money, name):
        self.money = money
        self.name = name


class Drawing(Thread):
    def __init__(self, drawingNum, account):
        Thread.__init__(self)
        self.drawingNum = drawingNum
        self.account = account
        self.expenseTotal = 0

    def run(self):

        if self.account.money - self.drawingNum < 0:
            print("余额不足")
            return
        sleep(1)  # 判断完成后阻塞，其他线程开始运行
        self.account.money -= self.drawingNum
        self.expenseTotal += self.drawingNum

        print(f"账户{self.account.name}，余额：{self.account.money}")
        print(f"账户{self.account.name}，总共取了：{self.expenseTotal}")


if __name__ == '__main__':
    a1 = Account(100, "huangjiawen")

    draw1 = Drawing(80, a1)  # 定义取钱线程对象
    draw2 = Drawing(80, a1)  # 定义取钱线程对象
    draw1.start()
    draw2.start()

运行结果及报错内容

C:\Users\黄佳文\AppData\Local\Microsoft\WindowsApps\python3.10.exe D:/pythonProject/pythonProject/MyThreadDemo/多个线程访问同一个资源（未使用线程同步）.py
账户huangjiawen，余额：20
账户huangjiawen，总共取了：80

我的解答思路和尝试过的方法

我想要达到的结果

抱歉，这个有问题，别打了