python正则下载图片

import urllib.request
import re

# 打开图片路径
def open_url(url):
    #设置请求路径
    req  = urllib.request.Request(url)
    #设置请求头
    req.add_header("User-Agent",‘Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36‘)
    #发送请求
    response = urllib.request.urlopen(req)
    #获取返回内容
    page = urllib.request.urlopen(req)
    html = page.read().decode(‘utf-8‘)
    return html
# 获取图片路径
def get_img(html):
    p =  ‘<img class="BDE_Image" src="([^"]+\.jpg)‘
    imglist = re.findall(p,html)
    ‘‘‘
    for each in imglist:
        print(each)
    ‘‘‘
    for each in imglist:
        filename = each.split("/")[-1]
        urllib.request.urlretrieve(each,filename,None)
#主函数
if __name__ == "__main__":
    url = "http://tieba.baidu.com/p/5838400549"
    get_img(open_url(url))