# -*- coding: UTF-8 -*-
import urllib2
import re
import time
req = urllib2.urlopen('http://www.xianlaiwan.cn/course/list?c=python')
buf =req.read()
listurl = re.findall(r'http://img.+.jpg',buf)
print listurl

i = 0
for url in listurl:
? ?file = open('D:/python/'+str(i)+'.jpg','w')
? ?req = urllib2.urlopen(url)
? ?buf = req.read()
? ?file.write(buf)
? ?i += 1
? ?time.sleep(1)