[python爬虫]如何爬取特定网页的图片

#!/usr/bin/env python
# -*- coding:utf-8 -*-

"""
Created on Sun Aug 02 20:10:36 2015

@author: lijiong
"""

import urllib
import sys
import chardet
import re

def get_html(url):
    page = urllib.urlopen(url)
    content = page.read()
    typeEncode = sys.getfilesystemencoding()
    infoencode = chardet.detect(content).get('encoding','utf-8')
    html = content.decode(infoencode,'ignore').encode(typeEncode)
    return html      #提取html页面，编码已经转换

def get_img(html):
    reg = r'src="(http://imgsrc.baidu.com/forum/w.*?\.jpg)"' 
    imgre = re.compile(reg)
    imglist = re.findall(imgre, html) #表达式中只有一个括号时，findall只会返回括号的内容
    i = 0
    for imgurl in imglist:
        print imgurl
        urllib.urlretrieve(imgurl, 'C:/Users/lijiong/Desktop/new/%s.jpg'%i)
        i+=1
        
html = get_html('http://tieba.baidu.com/p/3837885162')
get_img(html)