#coding:utf8
import re
import urllib
def getHTML(url):
    page = urllib.urlopen(url)
    html = page.read()
    return html

def getImg(html,imgType):
    reg = r'src="/tech-python/(/.._'+imgType+'!slider)" '
    imgre = re.compile(reg)
    imgList = re.findall(imgre, html)
    x=0
    for imgurl in imgList:
        print imgurl
        urllib.urlretrieve(imgurl, '%s.%s' % (x, imgType))
        x =x+1

html= getHTML("http://www.")

getImg(html,'jpg')