Python爬虫获取知乎图片

#coding=utf-8
import urllib
import re

def getHtml(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)