Implementation code for Python multi-threaded shared global variables

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Global variables are shared by all threads in a process. But multi-threaded changes to global variables can cause variable values ​​to get messed up.

Example: Verify that all threads in the same process share global variables

Code:

#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()

Result:

start---num: 1000
work1----num: 1003
work2---num: 1003

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