对正则表达式要有更加深刻的研究，本程序对百度贴吧使用，但是截取不了表情。如果想把所有页面的内容都获取下来不难，拓展一下即可。

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

import urllib

import urllib2

import re

#处理页面标签类

class Tool:

#去除img标签,7位长空格

removeImg = re.compile('| {7}|')

#删除超链接标签

removeAddr = re.compile('|')

#把换行的标签换为\n

replaceLine = re.compile('

|

|')

#将表格制表

替换为\t

replaceTD= re.compile('

')

#把段落开头换为\n加空两格

replacePara = re.compile('

')

#将换行符或双换行符替换为\n

replaceBR = re.compile('
|
')

#将其余标签剔除

removeExtraTag = re.compile('<.>')

def replace(self,x):

x = re.sub(self.removeImg,"",x)

x = re.sub(self.removeAddr,"",x)

x = re.sub(self.replaceLine,"\n",x)

x = re.sub(self.replaceTD,"\t",x)

x = re.sub(self.replacePara,"\n ",x)

x = re.sub(self.replaceBR,"\n",x)

x = re.sub(self.removeExtraTag,"",x)

#strip()将前后多余内容删除

return x.strip()

#百度贴吧爬虫类

class BDTB:

#初始化，传入基地址，是否只看楼主的参数

def __init__(self,baseUrl,seeLZ):

self.baseURL = baseUrl

self.seeLZ = '?see_lz='+str(seeLZ)

self.tool = Tool()

self.file = None

self.defaultTitle = u"百度贴吧"

#传入页码，获取该页帖子的代码

def getPage(self,pageNum):

try:

url = self.baseURL+ self.seeLZ + '&pn=' + str(pageNum)

request = urllib2.Request(url)

response = urllib2.urlopen(request)

content = response.read().decode('utf-8')

#print content

return content

except urllib2.URLError, e:

if hasattr(e,"reason"):

print u"连接百度贴吧失败,错误原因",e.reason

return None

def getTitle(self):

page = self.getPage(1)

pattern = re.compile('

(.*?)',re.S)

#pattern = re.compile('

(.*?)',re.S)

#_compile(pattern, flags).search(string)报错就修改，加str

#result = re.search(pattern,str(page))

#findall得到的result是list结构的

result = re.findall(pattern,page)

if result:

#print result.group(1) #测试输出

#return result.group(1).strip()

#print result.encode('utf-8')

"""

因为result是list，只有一维的

for i in range(len(result)):

for j in range(len(result[i])):

print result[i][j].encode('utf-8')

"""

for i in range(len(result)):

print '标题:'+ result[i].encode('utf-8') + '\n'

self.file = open(result[i]+ ".txt","w+")

self.file.writelines(result[i].encode('utf-8') + '\n')

self.file.close()

#print result

return result[0]

else:

return None

# 获取帖子一共有多少页

def getPageNum(self):

page = self.getPage(1)

pattern = re.compile('

(.*?)',re.S)

#result = re.search(pattern,page)

result = re.findall(pattern,page)

if result:

#print result.group(1) #测试输出

#return result.group(1).strip()

#for i in range(len(result)):

# print result[i].encode('utf-8')

#print result

return result[0].encode('utf-8')

else:

return None

#获取每一层楼的内容,传入页面内容

def getContent(self):

page = self.getPage(1)

#pattern = re.compile('

',re.S)

#pattern = re.compile('