您好，请参考爬取贴吧图片的案列代码：
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="(.+?.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))