多线程

多线程

import threading
import time


def music():
    print('begin to listen music %s' % time.ctime())
    time.sleep(3)
    print('stop to listen music %s' % time.ctime())


def game():
    print('begin to play game%s' % time.ctime())
    time.sleep(5)
    print('stop to play game%s' % time.ctime())


if __name__ == '__main__':
    t1 = threading.Thread(target=music)
    t1.start()
    t2 = threading.Thread(target=game)
    t2.start()
    t2.join()  # 等待子线程结束
    print('ending')
结果
begin to listen music Sat Apr 11 23:01:55 2020
begin to play gameSat Apr 11 23:01:55 2020
stop to listen music Sat Apr 11 23:01:58 2020
stop to play gameSat Apr 11 23:02:00 2020
ending

进程完成，退出码 0

设置守护线程，可以让某个子线程跟随子线程结束而结束

import threading
import time


def music():
    print('begin to listen music %s' % time.ctime())
    time.sleep(3)
    print('stop to listen music %s' % time.ctime())


def game():
    print('begin to play game%s' % time.ctime())
    time.sleep(5)
    print('stop to play game%s' % time.ctime())


l = list()

t1 = threading.Thread(target=music)

t2 = threading.Thread(target=game)
t2.setDaemon(True)
l.append(t1)
l.append(t2)
输出：
begin to listen music Sat Apr 11 23:17:56 2020
begin to play gameSat Apr 11 23:17:56 2020
ending
stop to listen music Sat Apr 11 23:17:59 2020

进程完成，退出码 0

import threading
import time


def music():
    print('begin to listen music %s' % time.ctime())
    time.sleep(3)
    print('stop to listen music %s' % time.ctime())


def game():
    print('begin to play game%s' % time.ctime())
    time.sleep(5)
    print('stop to play game%s' % time.ctime())


l = list()

t1 = threading.Thread(target=music)

t2 = threading.Thread(target=game)
t2.setDaemon(True)
l.append(t1)
l.append(t2)
if __name__ == '__main__':
    for t in l:
        # t.setDaemon(True)  # 守护线程，使该线程跟着主线程一起结束
        t.start()
        # print(threading.active_count())
        print(t.getName())
        print(threading.current_thread())
    print(threading.active_count())
    print(threading.enumerate())
    print(threading.current_thread())
    print('ending')
输出：
begin to listen music Sat Apr 11 23:32:12 2020Thread-1
<_MainThread(MainThread, started 9716)>

begin to play gameSat Apr 11 23:32:12 2020
Thread-2
<_MainThread(MainThread, started 9716)>
3
[<_MainThread(MainThread, started 9716)>, <Thread(Thread-1, started 16748)>, <Thread(Thread-2, started daemon 14432)>]
<_MainThread(MainThread, started 9716)>
ending
stop to listen music Sat Apr 11 23:32:15 2020

进程完成，退出码 0