使用两个线程时，如何在每次更改后打印值

import threading

# 共享变量
shared_value = None

# 互斥锁
lock = threading.Lock()

# 更改值的线程函数
def change_value():
    global shared_value
    new_value = 10  # 假设每次更改为固定值10

    # 获取互斥锁
    lock.acquire()

    # 更新共享变量的值
    shared_value = new_value

    # 释放互斥锁
    lock.release()

# 打印值的线程函数
def print_value():
    global shared_value

    # 获取互斥锁
    lock.acquire()

    # 打印共享变量的值
    print("当前值为:", shared_value)

    # 释放互斥锁
    lock.release()

# 创建并启动线程
change_thread = threading.Thread(target=change_value)
print_thread = threading.Thread(target=print_value)

change_thread.start()
print_thread.start()

# 等待线程结束
change_thread.join()
print_thread.join()