我所用到的库BeautifulSoup，requests

# encoding:utf-8

import os, urllib, re, urllib2, requests, gzip
from StringIO import StringIO
from bs4 import BeautifulSoup

# 加上头部信息伪装成浏览器
req_header = {
    'User-Agent': 'Mozilla/4.0 (Windows NT 6.1) AppleWebKit/537.11 (KHTML, like Gecko) '
                  'Chrome/23.0.1271.64 Safari/537.11',
    'Accept': 'text/html;q=0.9,*/*;q=0.8',
    'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.3',
    'Accept-Encoding': 'gzip',
    'Connection': 'close',
    'Referer': None  # 注意如果依然不能抓取的话，这里可以设置抓取网站的host
}

# 传入URL获取网页文本信息
def get_html(url):
    # page = requests.get(url)
    req = urllib2.Request(url=url, headers=req_header)
    res = urllib2.urlopen(req, timeout=5)
    html = res.read()

    print 'Content-Encoding :', res.info().get('Content-Encoding')  # 如果网页通过gzip压缩，需要解压
    if res.info().get('Content-Encoding') == 'gzip':
        buf = StringIO(html)
        f = gzip.GzipFile(fileobj=buf)
        html = f.read()
    return html


# 根据html网页匹配其中所有 src=.....jpg 的信息 并返回链接列表
def get_imglink(html_text):
    img = re.compile(r'src="(.+?\.jpg)"')
    imglist = re.findall(img, html_text)
    return imglist


# 用bs获取图片链接
def get_imglink2(html_text):
    bs = BeautifulSoup(html_text, 'html.parser', from_encoding='utf-8')
    links = bs.find_all('img')
    imglist = []
    for link in links:
        imglist.append(link.get('src'))
    return imglist


# 根据链接列表获取到图片，写入文件  用的是requests 比urllib稳定
def get_img2(imgs, path):
    dirname = './%s' % path
    if not os.path.exists(dirname):
        os.makedirs(dirname)
    for imgurl in imgs:
        filename = imgurl.split('/')[-1]
        local = os.path.join(dirname, filename)
        print local
        try:
            with open(local, 'wb') as jpg:
                jpg.write(requests.get('http:'+imgurl, stream=True, headers=req_header).content)
        except requests.RequestException,e:
            print e

if __name__ == '__main__':
    for num in range(3):
        html = get_html('http://jandan.net/ooxx/page-%s#comments' % str(2000 - num))
        imgs = get_imglink2(html)
        get_img2(imgs, u'你要的图')
    print u'图片共：', len(imgs)

• 煎蛋网的页面是gzip压缩后的，需要解压再，从中解析element

• try except 是有的imgurl前面有http前缀，有的没有。所以循环是request会抛出异常

• with 语句用来打开文件很好，可以自动关闭流。