百度贴吧的内容的爬取，以一个NBA吧的实例，在python3.6上，IDE是pycharm，最新的正则。

import urllibimport refrom urllib import request#处理页面标签类class Tool:    #去除img标签,7位长空格    removeImg = re.compile('<img.*?>| {7}|')    #删除超链接标签    removeAddr = re.compile('<a.*?>|</a>')    #把换行的标签换为\n    replaceLine = re.compile('<tr>|<div>|</div>|</p>')    #将表格制表<td>替换为\t    replaceTD= re.compile('<td>')    #把段落开头换为\n加空两格    replacePara = re.compile('<p.*?>')    #将换行符或双换行符替换为\n    replaceBR = re.compile('<br><br>|<br>')    #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()class BDTB:    def __init__(self,baseUrl,seeLZ,floorTag):        self.baseURL = baseUrl        self.seeLZ = '?see_lz='+str(seeLZ)        self.tool = Tool()        self.file = None        # 楼层标号，初始为1        self.floor = 1        # 默认的标题，如果没有成功获取到标题的话则会用这个标题        self.defaultTitle = u"百度贴吧"        # 是否写入楼分隔符的标记        self.floorTag = floorTag    def getPage(self,pageNum):        try:            url = self.baseURL+self.seeLZ+'&pn='+str(pageNum)            request = urllib.request.Request(url)            response = urllib.request.urlopen(request)            #print(response.read().decode('utf-8'))            content = response.read().decode('utf-8')            return content        except urllib.error.URLError as 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):        #print(page)        pattern = re.compile('<h3 class="core_title_txt.*?>(.*?)</h3>', re.S)        result = re.search(pattern, str(page))        if result:            #print(result.group(1))            return result.group(1).strip()        else:            return None    def getPageNum(self, indexPage):        pattern = re.compile('<span class="red">(.*?)</span>', re.S)        result = re.search(pattern, indexPage)        if result:            #print(result.group(1))            return result.group(1).strip()        else:            return None    def getContent(self, page):        pattern = re.compile('<div id="post_content_.*?>(.*?)</div>', re.S)        items = re.findall(pattern, page)        floor = 1        contents = []        #items_res = list()        for item in items:            content ='\n'+self.tool.replace(item)+'\n'            contents.append(content)            #print(floor,u'楼-----------------------------------------------------\n')            #items_res.append(self.tool.replace(item))            #print(self.tool.replace(item))            floor += 1            return contents    def write(self, contents):        for item in contents:            filename = 'tieba.txt'            with open(filename, 'a') as file_object:                if self.floorTag == '1':                    # 楼之间的分隔符                    floorLine = "\n" + str(                        self.floor) + u"-----------------------------------------------------------------------------------------\n"                    file_object.write(floorLine)                file_object.write(str(item))                self.floor += 1    def start(self):        indexPage = self.getPage(1)        #print(indexPage)        pageNum = self.getPageNum(indexPage)        title = self.getTitle(indexPage)        if pageNum ==None:            print('URL已失效，请重试！！')            return        try:            print("该帖子共有"+str(pageNum)+'页')            for i in range(1,int(pageNum)+1):                print('正在写入第'+str(i)+'页数据')                page = self.getPage(i)                contents = self.getContent(page)                self.write(contents)        except IOError as e:            print("写入异常，原因" + e.message)        finally:            print("写入任务完成")# batb = BDTB(baseURL, 1,1)# print(batb.getPage(1))# print(u'请输入帖子网址')# baseurl  = input(u'请输入帖子网址:')# seeLZ = input("是否只获取楼主发言，是输入1，否输入0\n")# floorTag = input("是否写入楼层信息，是输入1，否输入0\n")# bdtb = BDTB(baseurl, seeLZ)# bdtb.start()#baseURL = 'https://tieba.baidu.com/p/' + str(input(u'https://tieba.baidu.com/p/'))baseURL = 'https://tieba.baidu.com/p/3138733512'seeLZ = input("是否只获取楼主发言，是输入1，否输入0\n")floorTag = input("是否写入楼层信息，是输入1，否输入0\n")bdtb = BDTB(baseURL,seeLZ,floorTag)bdtb.start()