python爬虫抓取图片 终端报错 <urlopen error no hsot given> 是什么原因？，,python利用urll

#coding=utf-8import osimport requestsfrom pyquery import PyQuery as Qdef download_image(image_url):    if not image_url.startswith('http:'):        image_url = 'http:{}'.format(image_url)    image_dir = './image'    if not os.path.exists(image_dir):        os.mkdir(image_dir)    _, image_name = os.path.split(image_url)    image_path = os.path.join(image_dir, image_name)    print 'download:', image_url,    try:        r = requests.get(image_url)        with open(image_path, 'wb') as f:            f.write(r.content)        print 'success'    except:        print 'error'if __name__ == '__main__':    for i in range(2000, 2020):        url = 'http://jandan.net/ooxx/page-{0}'.format(i)        print 'get:', url        r = requests.get(url)        for _ in Q(r.text).find('img'):            image_url = Q(_).attr('src')            download_image(image_url)

......改进了代码.写入了try.虽然还是会报错......但是不妨碍继续下载图片........
代码如下：

#!/usr/bin/python# -*- coding:utf-8 -*-import urllibimport requestsimport refrom bs4 import BeautifulSoupimport csvimport socket socket.setdefaulttimeout(300)headers = {"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36"}#url池url1 = ('http://jandan.net/ooxx/page-')urls = []src_list = []for i in range(1500,2380):        urls.append(url1+str(i))print (urls)  for url in urls:#从url池中获取url    r = requests.get(url,headers = headers)#获取页面    html = BeautifulSoup(r.text,'html.parser')    for link in html.find_all('img'):        try:            src_list.append('http:'+link.get('src'))        except:            print ('url获取错误')  src_list.pop()print (src_list)tmp = 0        for src in src_list:    try:        urllib.request.urlretrieve(src,r'C:\Users\姜梦天\Desktop\spider\img\%s.jpg' % tmp)        tmp = tmp+1    except:        print ('失败')    print ('下载完毕')

可以下载众多妹子的图片了