3.[Python]多線程程式Ctrl+C的優雅終止__Python

轉載請註明原始出處：http://blog.csdn.net/a464057216/article/details/47678781

多線程編程中，經常會遇到怎麼讓程式優雅地停止的問題，舉一個簡單的例子：

#!/usr/bin/env python# -*- coding: utf-8 -*# Written by - CSDN:Mars Loo的部落格import threading, timedef printA():    while True:        print 'a'        time.sleep(1)def printB():    while True:        print 'b'        time.sleep(1)if __name__ == '__main__':    try:        a = threading.Thread(target = printA)        b = threading.Thread(target = printB)        a.start()        b.start()        a.join()        b.join()    except Exception, exc:        print exc

printA和printB兩個線程分別不斷的隔1s列印字母a和b，但是這樣的程式跑起來以後用Ctrl+C根本殺不掉，只有關掉終端視窗或者kill掉這個進程：

mars@mars-Ideapad-V460:~/test$ python ctrl.py ab^C^Cab^C^Ca b^Ca bab

如果把兩個進程都設定成守護進程，倒是可以用Ctrl+C終止程式:

        # Written by - CSDN:Mars Loo的部落格        a = threading.Thread(target = printA)        b = threading.Thread(target = printB)        a.setDaemon(True)        a.start()        b.setDaemon(True)        b.start()        while True:            pass

執行結果：

mars@mars-Ideapad-V460:~/test$ python ctrl.pyabba^CTraceback (most recent call last):  File "ctrl.py", line 25, in <module>    while True:KeyboardInterrupt

但是上面的方法又會在螢幕上輸出醜陋的traceback資訊，下面介紹一種優雅的方法：

#!/usr/bin/env python# -*- coding: utf-8 -*# Written by - CSDN:Mars Loo的部落格import threading, time, signalimport sysdef printA():    while True:        print 'a'        time.sleep(1)def printB():    while True:        print 'b'        time.sleep(1)def quit(signum, frame):    print 'You choose to stop me.'    sys.exit()if __name__ == '__main__':    try:        signal.signal(signal.SIGINT, quit)        signal.signal(signal.SIGTERM, quit)        a = threading.Thread(target = printA)        b = threading.Thread(target = printB)        a.setDaemon(True)        a.start()        b.setDaemon(True)        b.start()        while True:            pass    except Exception, exc:        print exc

執行結果：

mars@mars-Ideapad-V460:~/test$ python ctrl.py abb aa b^CYou choose to stop me.

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