python多线程

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# _*_ coding:utf8 _*_ from threading import Thread import time   def run(n):        for tc in xrange(1,60):         print str(n)+'的'+str(tc)+'线程一直在执行时间:'+str(time.time())+"\n"                time.sleep(1)     pass   def startthread():     t1 = Thread(target=run,args=(1,))     t2 = Thread(target=run,args=(2,))     t3 = Thread(target=run,args=(3,))     t4 = Thread(target=run,args=(4,))     t5 = Thread(target=run,args=(5,))     t1.start()     t2.start()     t3.start()     t4.start()     t5.start()     pass   if __name__ == '__main__':     startthread()     pass