进程间通信之类的，用得着，

可以自定义接到信息之后的动作。

file1.py

#!/usr/bin/env python# -*- coding: utf-8 -*-import osimport signalfrom time import sleepdef onsignal_term(a, b):    print("Get SIGTERM signal")signal.signal(signal.SIGTERM, onsignal_term)def onsignal_usr1(a, b):    print("Get SIGUSR1 signal")signal.signal(signal.SIGUSR1, onsignal_usr1)while 1:    print("My process id is: ", os.getpid())    sleep(10)

file2.py

import osimport signalfrom time import sleepwhile 1:    os.kill(25334, signal.SIGTERM)    os.kill(25334, signal.SIGUSR1)    sleep(3)