Python爬取一个网页的图片

import urllib2
import re
req=urllib2.urlopen('https://www.imooc.com/course/list')
buf=req.read()
listurl =re.findall(r'http:.+\.jpg',buf)
print listurl
i=1
for url in listurl:
    f=open(str(i)+'.jpg','wb')
    req=urllib2.urlopen(url)
    buf=req.read()
    f.write(buf)
    i+=1import urllib2
import re
req=urllib2.urlopen('h