# 创建一个Thread实例，传给它一个函数；

import threading
from time import sleep, ctime

loops = [4,2]

def loop(nloop, nsec):
    print "start loop", nloop, "at:",ctime()
    sleep(nsec)
    print "end loop", nloop, "at:",ctime()  
        
def main():
    print "*****start*********", ctime()
    threads = []
    nloops = range(len(loops))
    
    for i in nloops:
        t = threading.Thread(target=loop, args=(i, loops[i]))
        threads.append(t)
        
    # start threads
    for i in nloops:
        threads[i].start()
    
    # wait for all  threads to finish 
    for i in nloops:
        threads[i].join()
        
    print "*******end*******", ctime()
    
if __name__ == "__main__":
    main()