python下载图片

import re  import urllib    def getHtml(url):      page = urllib.urlopen(url)      html = page.read()      return html    def getImg(html):      reg = r'src="(.+?\.jpg)" pic_ext'      imgre = re.compile(reg)      imglist = imgre.findall(html)      x = 0      for imgurl in imglist:          urllib.urlretrieve(imgurl,'%s.jpg' % x)          x = x + 1               html = getHtml("http://tieba.baidu.com/p/2460150866")  getImg(html)