python中threading的setDaemon、join的用法

python 中的thread的一些机制：python 主线程结束后,会默认等待子线程结束后，主线程才退出。 #coding=utf-8 import threading from time import ctime,sleep def music(func): for i in range(2): print "I was listening to %s. %s" %(func,ctime()) sleep(1) def move(func): for i in range(2): print "I was at the %s ! %s" %(func,ctime()) sleep(5) threads = [] t1 = threading.Thread(target=music,args=(u'爱情买卖',)) threads.append(t1) t2 = threading.Thread(target=move,args=(u'阿凡达',)) threads.append(t2) if __name__ == '__main__': for t in threads: #t.setDaemon(True) t.start() #t.join() print "all over %s" %ctime() 运行结果如下： I was listening to 爱情买卖. Mon Mar 13 11:51:55 2017 I was at the 阿凡达 ! Mon Mar 13 11:51:55 2017 all over Mon Mar 13 11:51:55 2017 I was listening to 爱情买卖. Mon Mar 13 11:51:56 2017 I was at the 阿凡达 ! Mon Mar 13 11:52:00 2017 [Finished in 10.1s] 主线程 all over Mon Mar 13 11:51:55 2017 已经结束了，但是子线程还在继续运行。 python 对于 thread的管理中有两个函数 join  和 setDaemon  join： 如果在一个线程B中调用b.join()，则在b结束后，b才会接着b.join()往后运行 setDaemon: 主线程A启动了子线程B，调用b.setDaemaon(True),则主线程结束时，会把子线程B也杀死。 if __name__ == '__main__': for t in threads: t.setDaemon(True) t.start() #t.join() print "all over %s" %ctime() 运行结果： I was listening to 爱情买卖. Mon Mar 13 11:56:38 2017 I was at the 阿凡达 ! Mon Mar 13 11:56:38 2017 all over Mon Mar 13 11:56:38 2017 [Finished in 0.1s] all over Mon Mar 13 11:56:38 2017 主线程结束后，不在有输出 如果想让子线程运行完毕，那么添加join方法 if __name__ == '__main__': for t in threads: t.setDaemon(True) t.start() t.join() print "all over %s" %ctime() 输出如下： I was listening to 爱情买卖. Mon Mar 13 11:58:08 2017 I was at the 阿凡达 ! Mon Mar 13 11:58:08 2017 I was listening to 爱情买卖. Mon Mar 13 11:58:09 2017 I was at the 阿凡达 ! Mon Mar 13 11:58:13 2017 all over Mon Mar 13 11:58:18 2017 [Finished in 10.1s]