模拟银行取款 初始金额1000元 两个线程为取款用户，取款200，300，并在屏幕输出两个线程为存款用户，存款100，400，并在屏幕输出·线程结束后，显示余额 Python实现

在Python中，我们可以使用`threading`模块来模拟并发的银行取款和存款操作。这里是一个简单的例子，我们将使用锁（`Lock`）来保证线程安全，因为多个线程同时访问同一资源可能导致数据竞争：

import threading

# 初始余额
balance = 1000
lock = threading.Lock()

class AccountOperation:
    def __init__(self, operation, amount):
        self.operation = operation
        self.amount = amount

    def execute(self):
        global balance
        lock.acquire()  # 获取锁
        try:
            if self.operation == 'withdraw':
                balance -= self.amount
                print(f"Thread {threading.current_thread().name} is a withdraw user, withdrawing {self.amount}, new balance: {balance}")
            elif self.operation == 'deposit':
                balance += self.amount
                print(f"Thread {threading.current_thread().name} is a deposit user, depositing {self.amount}, new balance: {balance}")
        finally:
            lock.release()  # 无论操作成功与否都会释放锁

# 创建取款和存款任务
withdraw_task1 = AccountOperation('withdraw', 200)
deposit_task1 = AccountOperation('deposit', 100)
withdraw_task2 = AccountOperation('withdraw', 300)
deposit_task2 = AccountOperation('deposit', 400)

# 启动线程
threads = [threading.Thread(target=task.execute) for task in [withdraw_task1, withdraw_task2, deposit_task1, deposit_task2]]
for t in threads:
    t.start()
for t in threads:
    t.join()  # 等待所有线程完成

print("All operations completed, final balance:", balance)