from threading import Thread,Lock

from time import sleep, ctime 

global_num = []

def func1():

    global global_num

    for i in range(5):

        sleep(1)  #假设是最耗时的主过程

        lock.acquire()#两个线程会最开始抢这个锁，拿到锁就会处于关锁，执行后面的程序，其他线程执行处于监听状态，等待这个线程开锁，再抢锁

        global_num.append(1)

        print('-----%s---func1----:global_num=%s--------\n'%(ctime(),global_num))

        lock.release()

def func2():

    global global_num

    for i in range(3):

        sleep(1)

        lock.acquire()

        global_num.append(2)

        print('-----%s---func2-----:global_num=%s========\n'%(ctime(),global_num))

        lock.release()

print('global_num=',global_num)

lock = Lock()

t1 = Thread(target=func1)

t1.start()

t2 = Thread(target=func2)

t2.start()

t1.join()

t2.join()

print('global_num=%s\n'%global_num)