爬虫，爬取百度贴吧图片，未完善，请指教

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代码如下：用的 Python3.5
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import urllib.request
import re
import os

# 打开网页
def url_open(url):
    req = urllib.request.Request(url)
    req.add_header(‘User-Agent‘, ‘Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36‘)
    response = urllib.request.urlopen(url)
    html = response.read()
    return html

# 下载并保存图片
def download(urls):
    for link in urls:
        html = url_open(link).decode(‘utf-8‘)
        p = r‘<img class="BDE_Image" src="([^"]+\.jpg)‘
        result = re.findall(p, html)
        for i in result:
            filename = i.split(‘/‘)[-1]
            urllib.request.urlretrieve(i, filename, None)

# 爬取本页内全部帖子的链接
def findlink(url):
    html = url_open(url).decode(‘utf-8‘)
    p = r‘<a href="/p/\d+"‘
    result = re.findall(p, html)
    urls = []
    for i in result:
        newurl = ‘http://tieba.baidu.com/‘+ i.split(‘"‘)[-2]
        urls.append(newurl)
    download(urls)

# 创建文件夹
def start(folder = ‘picture‘):
    os.mkdir(folder)
    os.chdir(folder)

    findlink(url)

#name = urllib.parse.quote(input(‘请输入贴吧名：‘))
#num = input(‘请输入页码，0代表第一页，50为第二页，100为第三页，以此类推：‘)


# 贴吧网址，请根据需要自行替换，注意我这里的网址是处理过的，方便选页。
#url = ‘http://tieba.baidu.com/f?kw=‘+name+‘&ie=utf-8&pn=‘ + ‘num‘
url = ‘http://tieba.baidu.com/f?kw=%E6%9D%A8%E4%B8%9E%E7%90%B3&ie=utf-8&pn=100‘


# 运行脚本
start()
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问题多多，继续学习再回头改进吧，有路过的朋友请不吝赐教，非常感谢。

爬虫，爬取百度贴吧图片，未完善，请指教

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原文地址：http://www.cnblogs.com/JMWhite/p/5831440.html