python批量下载淘宝图片3

import urllib.request
import os
def url_open(url):
    req = urllib.request.Request(url)
    req.add_header('User-Agent', 'Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.134 Safari/537.36')
    response = urllib.request.urlopen(url)
    html = response.read()
    return html
def get_page(url):
    html = url_open(url).decode('gbk')
    a = html.find('current-comment-page') + 23
    b = html.find(']',a)
    return html[a:b]
def find_imgs(url):
    html = url_open(url).decode('gbk')
    img_addrs = []
    a = html.find('img src=')　　#下载的只是img src = 格式的图片
    while a!=-1:
        b = html.find('.jpg',a,a+255)
        if b != -1:
            x = html[a+9:b+4]
            tt = x[47:]　　　　#解析图片的地址
            ttt = 'http://' + tt
            img_addrs.append(ttt)
        else:
            b = a + 9

        a = html.find('img src=',b)
    return img_addrs

def save_imgs(folder,img_addrs):
     for each in img_addrs:
          filename = each.split("/")[-1]
          urllib.request.urlretrieve(each,filename,None)

def download_picture(folder='WWWW'):
    #os.mkdir(folder)
    os.chdir(folder)
    url = "https://gboy.taobao.com/index.htm?ali_trackid=17_cfb4dbeb80eb264e50f77d137e3a83d0&spm=a21bo.7724922.8410.1.HwGQ44"
    img_addrs = find_imgs(url)
    save_imgs(folder,img_addrs)
if __name__=='__main__':
    download_picture()