直接贴代码了吧

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#!/usr/bin/env python

# -*- coding:utf-8 -*-

importurllib

importurllib2

defloadPage(url,filename):

"""

作用：根据url发送请求，获取服务器响应文件

url: 需要爬取的url地址

filename : 处理的文件名

"""

print"正在下载 "+ filename

headers = {"User-Agent":"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_0) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11"}

request = urllib2.Request(url,headers= headers)

returnurllib2.urlopen(request).read()

defwritePage(html,filename):

"""

作用：将html内容写入到本地

html：服务器相应文件内容

"""

print"正在保存 "+ filename

# 文件写入

withopen(filename,"w")asf:

f.write(html)

print"-"*30

deftiebaSpider(url,beginPage,endPage):

"""

作用：贴吧爬虫调度器，负责组合处理每个页面的url

url : 贴吧url的前部分

beginPage : 起始页

endPage : 结束页

"""

forpageinrange(beginPage,endPage +1):

pn = (page -1) *50

filename ="第"+str(page) +"页.html"

fullurl =url+"&pn="+str(pn)

#print fullurl

html = loadPage(fullurl,filename)

#print html

writePage(html,filename)

print"谢谢使用"

if__name__ =="__main__":

kw =raw_input("请输入需要爬取的贴吧名:")

beginPage =int(raw_input("请输入起始页："))

endPage =int(raw_input("请输入结束页："))

# http: // tieba.baidu.com / f?kw = python & fr = ala0 & tpl = 5

url ="http://tieba.baidu.com/f?"

key = urllib.urlencode({"kw": kw})

fullurl = url + key

tiebaSpider(fullurl,beginPage,endPage)

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拷贝运行即可