python 多线程和锁

import threading
import time

lock = threading.Lock()


def Count(id):
    global num;

    while True:
        if lock.acquire():  # 拿锁，使用资源，相当于C++11 mutex
            if num <= 100:
                print("Thread id is : %s     The num is %s\n" % (id, str(num)))
                num = num + 1
            else:
                break
            lock.release()
        # with lock:  # 自动释放，不用手动release,相当于C++11 lock_guard类模板
        #     if num <= 100:
        #         print("Thread id is : %s     The num is %s\n" % (id, str(num)))
        #         num = num + 1
        #     else:
        #         break


if __name__ == "__main__":
    num = 1
    t1 = threading.Thread(target=Count, args=('A',))
    t2 = threading.Thread(target=Count, args=('B',))

    t1.start()
    t2.start()

    time.sleep(5)