import urllib.requestimport geventfrom gevent import monkeymonkey.patch_all()def downloader(img_name, img_url):    req = urllib.request.urlopen(img_url)    img_content = req.read()    with open(img_name, "wb") as f:        f.write(img_content)def main():    gevent.joinall([        gevent.spawn(downloader, '1.jpg',                     'http://rpic.douyucdn.cn/live-cover/appCovers/2018/04/19/4108896_20180419012844_small.jpg'),        gevent.spawn(downloader, '2.jpg',                     'http://rpic.douyucdn.cn/live-cover/appCovers/2018/09/26/1864921_20180926212457_small.jpg')    ])if __name__ == '__main__':    main()