Python多线程共享全局变量的实现代码

#验证同一个进程内的所有线程共享全局变量

from threading import  Thread

import time

g_num=1000

def work1():

    global g_num

    g_num+=3

    print("work1----num:",g_num)

def work2():

    global g_num

    print("work2---num:",g_num)

if __name__ == '__main__':

    print("start---num:",g_num)

    t1=Thread(target=work1)

    t1.start()

    #故意停顿一秒，以保证线程1执行完成

    time.sleep(1)

    t2=Thread(target=work2)

    t2.start()

start---num: 1000

work1----num: 1003

work2---num: 1003