python抓取网页中的图片示例

#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="(.*?\.+'+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("//www.jb51.net")

getimg(html,'jpg')