python图片小爬虫

import re
import urllib
import os

def rename(name):
name = name + '.jpg'
return name

def getHtml(url):
page = urllib.urlopen(url)
html = page.read()
return html

def getImg(html):
reg = r'src="(.+?\.jpg)" pic_ext'
imgre = re.compile(reg)
imglist = re.findall(imgre,html)

os.chdir("E:\\pic")
os.getcwd()
x=1
for imgurl in imglist:
img=urllib.urlopen(imgurl)

name=str(x)
name = rename(name)
print(name)
x=x+1

f=open(name,'wb')
f.write(img.read())
f.close()

html = getHtml("http://tieba.baidu.com/p/3553148164")
getImg(html)
print 'pic save!'