python爬虫获取知乎图片

import urllib
import re
def (url):
    page = urllib.urlopen(url)
    html = page.read()
    return html
def getImg(html):
   # reg = r'<noscript><img src="(.+?.jpg)"'
    reg = r'data-actualsrc="(.+?.jpg)"'
    imgre = re.compile(reg)
    
    imglist = re.findall(imgre,html)
    
  
    x = 0
    for imgurl in imglist:
        urllib.urlretrieve(imgurl,'%s.jpg' % x)
        x+=1
html = getHtml("https://www.zhihu.com/question/24278285")
print getImg(html)