提及多线程,你须要知道多进程和多线程的区别,了解多线程的概念,至于这两点,我不打算在本片文章中详述了,不错,由于我懒得整理。。。不了解的请先问度娘python
打个比方,我想作听音乐和敲代码两件事儿,那么若是大脑简单的话必定要先排一下顺序编程
# coding=utf-8 from time import ctime,sleep def music(): for i in range(2): print "I was listening to music . %s" %ctime() sleep(1) def coding(): for i in range(2): print "I was coding codes! %s" %ctime() sleep(5) if __name__ =='__main__': music() coding() print " all over %s" %ctime()
咱们先听了一首音乐,经过for循环来控制音乐的播放了两次,每首音乐播放须要1秒钟,sleep()来控制音乐播放的时长。接着我又敲了会代码,由于比较苦逼,每段代码须要5秒钟,经过for循环敲了两遍。
数组
运行结果:多线程
那么我想告诉大家我听的什么歌、敲了什么代码。下面我将代码进行一个优化,用参数来控制歌曲和代码app
# coding=utf-8 from time import ctime,sleep def music(name): for i in range(2): print "I was listening to music . %s %s" %(name,ctime()) sleep(1) def coding(code): for i in range(2): print "I was coding codes! %s %s" %(code,ctime()) sleep(5) if __name__ =='__main__': music(u'伟大的闯爷') coding(u'python代码') print " all over %s" %ctime()
vagrant@homestead:~/release/python$ python xiancheng.py I was listening to music . 伟大的闯爷 Wed Jul 5 03:30:05 2017 I was listening to music . 伟大的闯爷 Wed Jul 5 03:30:06 2017 I was coding codes! python代码 Wed Jul 5 03:30:07 2017 I was coding codes! python代码 Wed Jul 5 03:30:12 2017 all over Wed Jul 5 03:30:17 2017
# coding=utf-8 # # 首先导入threading 模块,这是使用多线程的前提。 import threading from time import ctime,sleep def music(name): for i in range(2): print "I was listening to music . %s %s" %(name,ctime()) sleep(1) def coding(code): for i in range(2): print "I was coding codes! %s %s" %(code,ctime()) sleep(5) threads = [] #建立了threads数组,建立线程t1,使用threading.Thread()方法, #在这个方法中调用music方法target=music,args方法对music进行传参。 把建立好的线程t1装到threads数组中。 #定义单元素的tuple有歧义,因此 Python 规定,单元素 tuple 要多加一个逗号“,”,这样就避免了歧义: t1 = threading.Thread(target=music,args=(u'伟大的闯爷之歌',)) threads.append(t1) #接着以一样的方式建立线程t2,并把t2也装到threads数组。 t2 = threading.Thread(target=coding,args=(u'python代码',)) threads.append(t2) if __name__ =='__main__': for t in threads: #setDaemon(True)将线程声明为守护线程,必须在start() 方法调用以前设置,若是不设置为守护线程程序会被无限挂起。 #子线程启动后,父线程也继续执行下去, #当父线程执行完最后一条语句print "all over %s" %ctime()后,没有等待子线程,直接就退出了,同时子线程也一同结束。 t.setDaemon(True); #开始线程活动 t.start() print " all over %s" %ctime()
I was listening to music . 伟大的闯爷之歌 Wed Jul 5 03:53:03 2017 all over Wed Jul 5 03:53:03 2017
... if __name__ =='__main__': for t in threads: #setDaemon(True)将线程声明为守护线程,必须在start() 方法调用以前设置,若是不设置为守护线程程序会被无限挂起。 #子线程启动后,父线程也继续执行下去, #当父线程执行完最后一条语句print "all over %s" %ctime()后,没有等待子线程,直接就退出了,同时子线程也一同结束。 t.setDaemon(True); #开始线程活动 t.start() t.join() print " all over %s" %ctime()
I was listening to music . 伟大的闯爷之歌 Wed Jul 5 03:59:22 2017 I was coding codes! python代码 Wed Jul 5 03:59:22 2017 I was listening to music . 伟大的闯爷之歌 Wed Jul 5 03:59:23 2017 I was coding codes! python代码 Wed Jul 5 03:59:27 2017 all over Wed Jul 5 03:59:32 2017
I was listening to music . 伟大的闯爷之歌 Wed Jul 5 04:09:05 2017 I was coding codes! python代码 Wed Jul 5 04:09:05 2017 I was listening to music . 伟大的闯爷之歌 Wed Jul 5 04:09:09 2017 I was coding codes! python代码 Wed Jul 5 04:09:10 2017 all over Wed Jul 5 04:09:15 2017消耗的时间仍然为10s