120 python高级 - 多线程共享全局变量

from threading import Thread
import time
g_num = 100
def work1():
    global g_num
    for i in range(3):
        g_num += 1
    print("----in work1, g_num is %d---"%g_num)
def work2():
    global g_num
    print("----in work2, g_num is %d---"%g_num)
print("---线程创建之前g_num is %d---"%g_num)
t1 = Thread(target=work1)
t1.start()
#延时一会，保证t1线程中的事情做完
time.sleep(1)
t2 = Thread(target=work2)
t2.start()

---线程创建之前g_num is 100---
----in work1, g_num is 103---
----in work2, g_num is 103---

from threading import Thread
import time
def work1(nums):
    nums.append(44)
    print("----in work1---",nums)
def work2(nums):
    #延时一会，保证t1线程中的事情做完
    time.sleep(1)
    print("----in work2---",nums)
g_nums = [11,22,33]
t1 = Thread(target=work1, args=(g_nums,))
t1.start()
t2 = Thread(target=work2, args=(g_nums,))
t2.start()

----in work1--- [11, 22, 33, 44]
----in work2--- [11, 22, 33, 44]