Python小脚本--下载图片

import urllib, urllib2
"""
url = 'http://ww2.sinaimg.cn/bmiddle/80891114gw1ee0ln68kvwj20c80k4dhx.jpg'
urllib.urlretrieve(url, "a.jpg")
"""
urlhost = 'http://www.douban.com/photos/album/66861288/'
up = urllib2.urlopen(urlhost)
cont = up.read()
#print cont
l1 = cont.split('http://')
l2 = []
l3 = []
j = 0
for i in l1:
 if '.jpg' in i:
  l2.append(i)
for i in l2:
 a = i.split('.jpg')[0]
        l3.append('http://'+ a +'.jpg')
#print l3
for url in l3:
 urllib.urlretrieve(url, str(j)+".jpg")
 j +=1