python爬虫学习--下载图片

#coding=utf-8
import urllib.request
import urllib.parse
import re
url="http://tieba.baidu.com/p/2772656630"
def get_content(url):
    '''

    :param url:
    :return:
    '''
    html=urllib.request.urlopen(url)
    content=html.read().decode("utf-8")
    html.close()
    return content
info=get_content(url)

def get_images(info):
    '''

    :param info:
    :return:
    '''
    regex=r'class="BDE_Image" src="(.+?\.jpg)"'
    pat=re.compile(regex)
    image_code=re.findall(pat,info)
    i=0
    for url in image_code:
        urllib.request.urlretrieve(url,'C:\\Users\\jack\\Desktop\\myimage\\%s.jpg'%i)
        i+=1

get_images(info)