python 同时打开多个api

import urllib2
import time
a='http://tj.gongchang.com/api/purchase/?mark=purchase&secret=7232275'
b='http://tj.gongchang.com/api/productrecommend/?mark=recommend&cateid=8260&secret=7232275'
c='http://tj.yw.gongchang.com/api/supid/?mark=supply&cateid=16&supid=23&cid=2&secret=7232275'
#顺序执行
def test1():
    t=time.time()
    r1=urllib2.urlopen(a)
    r2=urllib2.urlopen(b)
    r3=urllib2.urlopen(c)
    t2=time.time()
    print 'chuanxing',t2-t
test1()
#########################
#进程池
def test2():
    from multiprocessing.dummy import Pool
    pool=Pool(3)
    t2=time.time()
    d,e,f=pool.map(urllib2.urlopen,[a,b,c])
    t3=time.time()
    print 'multiprocessing pool',t3-t2
    # print d.read()
    # print e.read()
    # print f.read()
    pool.close()
    pool.join()
test2()
##################################
#线程池
def test4():
    import threadpool
    import urllib2,time
    url_data_list=[]
    def put_handle(url):
        re=urllib2.urlopen(url)
        data=re.read()
        url_data_list.append((url,data))
    def main():
        pool=threadpool.ThreadPool(3)
        requests = threadpool.makeRequests(put_handle, [a,b,c])
        [pool.putRequest(req) for req in requests]
        pool.wait()
    t=time.time()
    main()
    # print url_data_list
    print 'threadpool',time.time()-t
test4()