线程_共享全局变量(全局变量在主线程和子线程中不同)

from threading import Thread
import time

g_num = 100

def work1():
    global g_num
    for i in range(3):
        g_num += 1
        print("----在work1函数中,g_num 是 %d "%(g_num))

def work2():
    global g_num
    print("在work2中，g_num为 %d "%(g_num))
if __name__ == ‘__main__‘:
    print("---线程创建之前 g_num 是 %d"%(g_num))
    t1 = Thread(target=work1)
    t1.start()
    t2 = Thread(target=work2)
    t2.start()