原文：https://blog.csdn.net/uyy203/article/details/89684996

import datetime
import sched
import threading
import time


def init():
    global s
    s = sched.scheduler(time.time,time.sleep)

def job1():
    print("i am working in job1")

def job2():
    print("i am working in job2")



def task1():
    threading.Thread(target=job1).start()
    s.enter(2,1,task1)

def task2():
    threading.Thread(target=job2).start()
    s.enter(5,1,task2)


def main():
    init()
    s.enter(2,1,task1)
    s.enter(5,1,task2)
    s.run()
    print(time.time)


if __name__=="__main__":
    main()

在這里插入圖片描述

很明顯，這樣使用sched.scheduler中的run() 會(huì)對(duì)線程進(jìn)行阻塞，最后的print(time.time)遲遲沒法打印出來。

import datetime
import sched
import threading
import time


def job1():
    print("i am working in job1")
    

def job2():
    print("i am working in job2")
    

def task1():
    s1 = sched.scheduler(time.time,time.sleep)
    s1.enter(2,1,job1)
    s1.run()

def task2():
    s2 = sched.scheduler(time.time,time.sleep)
    s2.enter(5,1,job2)
    s2.run()


def main():

    print("start")

    threading.Thread(target=task1).start()
    threading.Thread(target=task2).start()

    print("end")

if __name__=="__main__":
    main()

在這里插入圖片描述

明顯，把scheduler放進(jìn)子線程實(shí)現(xiàn)，可避免對(duì)主線程的阻塞。

另外，可以通過setDaemon(True) 把線程設(shè)置為后臺(tái)進(jìn)程，例如：

    t3=threading.Thread(target=task3)
    t3.setDaemon(True)#設(shè)置為后臺(tái)線程，這里默認(rèn)是False，設(shè)置為True之后則主線程不用等待子線程.
    t3.start()