python2下载网页图片

#! /usr/bin/python
import urllib, os,os.path
import logging
import datetime

#file log
log_file = '/root/logs/sys_%s.log' % datetime.datetime.strftime(datetime.datetime.now(), '%Y-%m-%d')
log_level = logging.INFO
log_format = '%(asctime)s[%(levelname)s]: %(message)s'
logging.basicConfig(filename=log_file, level=log_level, format=log_format)
log=logging.getLogger()

def url_open(url):
    response = urllib.urlopen(url)
    html = response.read()
    log.info('html..')
    return html

def find_imgs(url):
    html = url_open(url).decode('GB2312')
    img_addrs = []
    log.info('find_imgs..')
    a = html.find('img src=')
    total=0
    while a!=-1:
        print('w...')
        b=html.find('.jpg',a,a+40)
        if b!=-1:
            imgurl=html[a+9:b+4]
            img_addrs.append('http://www.people.com.cn'+imgurl)
        
            print(imgurl)
            total=total+1
        else:
            b=a+9
        a=html.find('img src=',b)
        if total>5:
           break
    return img_addrs

def save_imgs(folder, img_addrs):
    for each in img_addrs:
        filename = each.split('/')[-1]
        with open(filename, 'wb') as f:
            img = url_open(each)
            f.write(img)

def download_mm(folder = 'xx', pages = 5):
    if not os.path.exists('/root/xx'):
        os.mkdir('/root/xx')
    os.chdir('/root/'+folder)
    
    log.info('init..')
    url = 'http://www.people.com.cn/'
    img_addrs = find_imgs(url)
    log.info('imgs='+img_addrs[0])
    save_imgs(folder, img_addrs)

if __name__ == '__main__':
    download_mm()