Python 3.6 代码：
import re
import requests
i = 0
res = requests.get('http://www.imooc.com/search/course?words=python').text
urllist = re.findall(r'http://.+\.jpg',res)
for url in urllist:
f = open(str(i)+'.jpg','wb')
req = requests.get(url).content
f.write(req)
f.close()
i+=1
