提到多執行緒，很多人就會望而卻步，本文將由淺入深地帶你攻克python多執行緒程式設計，並防止你跳入深坑，
首先看一段簡單的**：
1 from time importctime,sleep2 defplay_video(video):3 for i in range(2):4 print "i am playing video: %s at %s"%(video,ctime())5 sleep(4)6
8 defplay_music(music):9 for i in range(2):10 print "i am playing music: %s at %s"%(music,ctime())11 sleep(2)12
14 if __name__=="__main__":15
16 play_video("speed_and_crazy")17 play_music("chengdu")18
19 print "all are over at %s"%ctime()20
執行結果：
c:\python27>python mui_thread.py
i am playing video: speed_and_crazy at mon jun26 23:01:59 2017i am playing video: speed_and_crazy at mon jun26 23:02:03 2017i am playing music: chengdu at mon jun26 23:02:07 2017i am playing music: chengdu at mon jun26 23:02:09 2017all are over at mon jun26 23:02:11 2017
隨著人們對多工的要求，同時為了充分利用cpu資源，多執行緒程式設計不可避免，那麼我們如何利用python去實現play_video和play_music
兩個任務同時執行呢？
1 from time importctime,sleep2 importthreading3 defplay_video(video):4 for i in range(2):5 print "i am playing video: %s at %s \n"%(video,ctime())6 sleep(5)7
9 defplay_music(music):10 for i in range(2):11 print "i am playing music: %s at %s \n"%(music,ctime())12 sleep(1)13
14 threads=15
16 thread1=threading.thread(target=play_video,args=("speed_and_crazy",))17
20 thread2=threading.thread(target=play_music,args=("chengdu",))21
26 if __name__=="__main__":27
28 for thread inthreads:29 thread.setdaemon(true) #將執行緒宣告為守護執行緒，必須在start()方法呼叫之前，如果不設定為守護執行緒,程式會被無限掛起30 thread.start()31
32 print "all are over at %s \n"%ctime()33
測試結果：
c:\python27>python mui_thread.py
i am playing video: speed_and_crazy at mon jun26 23:18:52 2017all are over at mon jun26 23:18:52 2017i am playing music: chengdu at mon jun26 23:18:52 2017 #從列印的時間可知，play_video、play_music和父程序幾乎同時執行
從結果看，與我們最初的目標相差甚遠，怎麼沒有按照順序執行，為什麼每個函式都只有一條日記輸出？
那是因為子執行緒(play_video、play_music)和主線程print "all are over at %s \n"%ctime()都是同一時間啟動，但由於主線程已經執行結束，所以導致子執行緒也同時終止，在這種條件下，我們如何保證子程序都能夠執行完畢呢？
增加thread.join()並 放在迴圈外
from time importctime,sleepimportthreadingdefplay_video(video):for i in range(2):print "i am playing video: %s at %s \n"%(video,ctime())
sleep(1)defplay_music(music):for i in range(2):print "i am playing music: %s at %s \n"%(music,ctime())
sleep(5)
threads=
thread1=threading.thread(target=play_video,args=("speed_and_crazy",))
thread2=threading.thread(target=play_music,args=("chengdu",))
thread.setdaemon(true)
thread.start()
thread.join() #加在迴圈外，print "all are over at %s \n"%ctime()
執行結果：
1 c:\python27>python mui_thread.py2 i am playing video: speed_and_crazy at mon jun 26 23:32:21 2017
3 i am playing music: chengdu at mon jun 26 23:32:21 2017
6 i am playing video: speed_and_crazy at mon jun 26 23:32:22 2017
8 i am playing music: chengdu at mon jun 26 23:32:26 2017
10 all are over at mon jun 26 23:32:31 2017
thread.join()的作用是主線程必須等待子執行緒都執行完了才能結束，play_video、play_music幾乎同時執行
但是如果改變play_video、play_music裡面的sleep的時長，即是下面的**：
from time importctime,sleepimportthreadingdefplay_video(video):for i in range(2):print "i am playing video: %s at %s \n"%(video,ctime())
sleep(5)defplay_music(music):for i in range(2):print "i am playing music: %s at %s \n"%(music,ctime())
sleep(1)
threads=
thread1=threading.thread(target=play_video,args=("speed_and_crazy",))
thread2=threading.thread(target=play_music,args=("chengdu",))
thread.setdaemon(true)
thread.start()
thread.join()print "all are over at %s \n"%ctime()
此時執行結果：
c:\python27>python mui_thread.py
i am playing video: speed_and_crazy at mon jun26 23:44:13 2017i am playing music: chengdu at mon jun26 23:44:13 2017i am playing music: chengdu at mon jun26 23:44:14 2017all are over at mon jun26 23:44:15 2017
我們看到play_video還有一條log沒有列印出來，原因是thread.join()在迴圈外，此時的thread為play_music，父程序只會等待play_music程序執行完就結束，而不會等待play_video(sleep時間較長)執行完才結束，所以才會有上面的結果
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