例一：不使用多线程

#-*-coding:utf-8-*-#compare for multi threadsafetyimport timedef worker():    print "worker"    time.sleep(1)    returnif __name__=="__main__":    for i in xrange(5):        worker()

例二：使用多线程

#-*-coding:utf-8-*-import threadingimport time def worker():    print "worker"    time.sleep(1)    return for i in xrange(5):    t=threading.Thread(target=worker)    t.start()

例三：返回线程和主线程

#-*-coding:utf-8-*-import threadingimport time def worker():    print "worker"    time.sleep(1)    return for i in xrange(5):    t=threading.Thread(target=worker)    t.start()print "current has %d threads" % (threading.activeCount() - 1)

例四：threading.enumerate()的使用。此方法返回当前运行中的Thread对象列表

#!/usr/bin/python#test the variable threading.enumerate()import threadingimport time def worker():    print "test"    time.sleep(2) threads = []for i in xrange(5):    t = threading.Thread(target=worker)    threads.append(t)    t.start() for item in threading.enumerate():    print item print for item in threads:    print item

例五：threading.setDaemon()的使用。设置后台进程。