关于多线程运行-互斥锁

import threading

num = 0

lock = threading.Lock()


def first_threading():
    global num
    for i in range(10000):
        lock.acquire()
        num += 1
        lock.release()


def second_threading():
    global num

    for i in range(10000):
        lock.acquire()
        num += 1
        lock.release()


if __name__ == '__main__':
    ft = threading.Thread(target=first_threading)
    st = threading.Thread(target=second_threading)
    ft.start()
    st.start()
    print(num)