python 多线程编程

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使用threading模块的Thread类来创建线程，介绍常用的三种方法：

1.创建一个Thread类的实例，传入一个函数

#coding=utf-8import threading, timeloops=[4,2]def func(index, sec):      print "func starts:%d"%(index)+"  %s\n"%(time.ctime())      time.sleep(sec)      print "func ends:%d"%(index)+"  %s\n"%(time.ctime())def main():     threads =[]     nloop = range(nlen(loops))     for i in nloop:          tt = threading.Thread(target=func, args=(i, loops[i]))          print "the name of the threadind:%s\n"%(tt.getName())          threads.append(tt)       for i in nloop:          threads[i].start()     for i in nloop:           threads[i].join()  #允许主线程等待所有的线程运行完之后在执行后面的逻辑     print "all done:%s\n"%(time.ctime())if __name__ == "__main__":     main()

2.创建一个Thread类实例，传入以个可调用的类对象

#coding=utf-8import time, threadingloops=[4,2]class MyThread(object):      def __init__(self, func, args,name=""):          self.args = args          self.func = func          self.name = name      def __call__(self, *args, **kwargs):          self.func(*self.args)def loop(nloop, nsec):    print "loop starts:%d"%(nloop) + "  %s\n"%(time.ctime())    time.sleep(nsec)    print "loop ends:%d"%(nloop) + "  %s\n"%(time.ctime())def main():    threads =[]    for i in range(len(loops)):        tt = threading.Thread(target=MyThread(loop, (i,loops[i]),loop.__name__))  #仅修改了这里        print "线程名字：",tt.getName()        threads.append(tt)    for i in range(len(loops)):        threads[i].start()    for item in threads:        item.join()    print "all done:%s\n"%(time.ctime())if __name__ == "__main__":    main()

3.子类化Thread类，创建一个子类的实例

#coding=utf-8import threading,timeloops=[4,2]class MyThread(threading.Thread):     def __init__(self,index, sec):         threading.Thread.__init__(self)         self.index = index         self.sec = sec     def run(self):         print "loop starts:%d"%(self.index) + "  %s\n"%(time.ctime())         time.sleep(self.sec)         print "loop ends:%d"%(self.sec) + "  %s\n"%(time.ctime())def main():    nloop = range(len(loops))    threads = []    for i in nloop:        tt = MyThread(i,loops[i])        print "线程名字：",tt.getName()        threads.append(tt)    for i in range(len(loops)):        threads[i].start()    for item in threads:        item.join()    print "all done:%s\n"%(time.ctime())if __name__ == "__main__":    main()

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