python线程池的实现实例

def down(url,n):
    print 'item '+str(n)+' start '
    filename=urllib2.unquote(url).decode('utf8').split('/')[-1]
    urllib.urlretrieve(url, filename)
    print 'item '+str(n)+' finish '

def worker():
    while True:
        i = q.get()
        url=i[0]
        n=i[1]
        down(url,n)
        q.task_done()

if __name__=="__main__":

    num_worker_threads=100

    f=open('url.txt')
    l=f.readlines()
    q = Queue.Queue()
    for i in range(num_worker_threads):
        t = threading.Thread(target=worker)
        t.daemon = True
        t.start()

    for i in range(0,len(l)):
        q.put((l[i],i))

    q.join()