爬虫练习：贴吧 https://tieba.baidu.com/f?kw=友谊已走到尽头

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 2020/8/28 10:05
# @Author : aqiong
# @Site : 
# @File : 贴吧爬虫.py
# @Software: PyCharm
#https://tieba.baidu.com/f?kw=友谊已走到尽头
#后缀：
#1.请求网页，获取数据，2，解析数据 3.存储数据
import re
import xlwt#存储数据
from bs4 import BeautifulSoup#分析网页
import urllib.request,urllib.error#请求网页


#标题
findTitle = re.compile(r'<a class="j_th_tit".*?title=".*?".*?>(.*?)</a>',re.S)
#主题作者
findauthor = re.compile(r'<span class="tb_icon_author" data-field=.*?title="(.*?)"><i class=.*?</span>')
#发布时间
findTime = re.compile(r'<div class="threadlist_abs threadlist_abs_onlyline">(.*?)</span>')
#发布内容
findContent = re.compile(r'<div class="threadlist_abs threadlist_abs_onlyline">(.*?)</div>',re.S)
#最后回复人
findLastReader = re.compile(r'<span class="tb_icon_author_rely j_replyer" title="(.*?)">')
#最后回复时间
findLastTime=re.compile(r'<span class="threadlist_reply_date pull_right j_reply_data" title="最后回复时间">(.*?)</span>',re.S)
#镇楼图
#findImgSrc = re.compile(r' <ul class="threadlist_media j_threadlist_media clearfix">*?src="(.*?).*?</ul>',re.S)
findImgSrc = re.compile(r'<img attr=.*?bpic="(.*?)".*?class="threadlist_pic j_m_pic".*?src=""/>',re.S)
#回复数
findReadNum = re.compile(r'<span class="threadlist_rep_num center_text" title="回复">(\d*?)</span>')
def main():
    #1.请求网页，获取数据
    baseUrl = 'https://tieba.baidu.com/f?kw=%E5%8F%8B%E8%B0%8A%E5%B7%B2%E8%B5%B0%E5%88%B0%E5%B0%BD%E5%A4%B4'
    #获取n条数据
    n= 200
    datalist = getdata(baseUrl,n)
    name = '贴吧帖子.xls'
    saveData(datalist,name)


def getdata(baseUrl,n):
    datalist = []
    for index in range(0,n,50):
       #获取每页的数据
        html = askURL(baseUrl+'&ie=utf-8&pn='+str(index))
        #html=html.replace('div class="t_con cleafix"','div class="t_concleafix"').replace('<!--','').replace('-->','')
        html = html.replace('<!--', '').replace('-->', '')

        soup = BeautifulSoup(html,'html.parser')


        #解析数据
       # for item in soup.find_all('div',class_='t_concleafix'):
        for item in soup.find_all('div',class_='t_con cleafix'):
            data = []
            item = str(item)

            #print(re.findall(findReadNum,item))
            #print(re.findall(findImgSrc, item))
            data.append(re.findall(findTitle,item)[0])
            if re.findall(findauthor,item) :
                data.append(re.findall(findauthor, item)[0])
            else :
                data.append(' ')

            if re.findall(findTime,item):
               data.append(re.findall(findTime,item))
            else:
                data.append('')
            data.append(re.findall(findContent,item)[0])
            data.append(re.findall(findLastReader,item)[0])
            data.append(re.findall(findLastTime,item)[0])
            data.append(re.findall(findReadNum, item))##这里不理解为什么当下面的图片链接都取出来，取回复数就会报错，或者取到的很多数据为空，但如果只取一个图片，则不报错，且数据显示正常，初步猜测和存取到excel有关系
            imglist = re.findall(findImgSrc,item)
            #print(re.findall(findReadNum, item))
            if imglist:
                data.append(imglist[0])
                for item in range(0,len(imglist)):
                    #print(imglist)
                    data.append(imglist[item]+'\n')
            else:
                data.append(' ')
            #data.append(re.findall(findReadNum, item))
            #print(re.findall(findReadNum,str(item)))
            datalist.append(data)
    return datalist


def askURL(baseUrl):
    html = ''
    headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36","Accept-Language": "zh-CN,zh;q=0.9"}
    request=urllib.request.Request(url=baseUrl,headers=headers)
    try:

       html = urllib.request.urlopen(request).read().decode('utf-8')


    except urllib.error.URLError as e:
        print(e)
    return html

def saveData(datalist,name):
    workbook = xlwt.Workbook(encoding='utf-8',style_compression=0)
    worksheet = workbook.add_sheet('帖子内容',cell_overwrite_ok=True)
    col = ('标题','主题作者','发布时间','发布内容','最后回复人','最后回复时间','回复数','镇楼图')
    for i in range(0,len(col)):
        worksheet.write(0,i,col[i])
    for item in  range(0,len(datalist)):
        data = datalist[item]
        for index in range(0,len(data)):
            worksheet.write(item+1,index,data[index])
    workbook.save(name)





if __name__ == '__main__':
    main()