import urllib.request
import re

def getHtml(url):
    page = urllib.request.urlopen(url)
    #read（）返回的结果是二进制的需要转换成字符串
    html =page.read().decode("utf-8")
    return html

def getImage(page):

    reg=r‘src="http://www.mamicode.com/(.+?\.jpg)" size‘
    imgre=re.compile(reg)
    print (imgre)
    imglist=re.findall(imgre,page)
    print (imglist)
    x=0
    for i in imglist:
        urllib.request.urlretrieve(i,‘%s.jpg‘ %x)
        x+=1
    return imglist

html=getHtml("http://tieba.baidu.com/p/4721099001")
print(getImage(html))