为什么爬取这个网页的输出却得到 None？代码如下

#coding=utf-8

import urllib

import re



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 = re.findall(imgre,html)

x = 0

for imgurl in imglist:

urllib.urlretrieve(imgurl,'%s.jpg' % x)

x+=1





html = getHtml("http://7mx.com/photo/444648")



print getImg(html)