【Python】百度贴吧-中国好声音评论爬爬【自练OK-csv提取格式及评论提取空格等问题待改进】

代码编写思路：

学习知识点：

1.class=a b(a假设是字体-宋体，b是颜色-蓝色；class中可以同时有两个参数a,b（宋体+蓝色），两者用空格隔开即可)

2.拓展1：想要soup到某个元素，且该元素对应class中含有多个值，我们可以根据class中元素出现的规律，找到共性出现的元素去编写soup中内容。

例如 想soup中的class可以找到相关规律，发现想找的元素对应class中都含有“l_post_bright”那么写成以下形式即可找到相关的元素对应内容。

soup.find_all('div', class_="l_post_bright") 即可。

百度贴吧-中国好声音评论爬爬

 # coding=utf-8
 import csv
 import random
 import io
 from urllib import request,parse,error
 import http.cookiejar
 import urllib
 import re
 from bs4 import BeautifulSoup

 # 爬爬网址
 #homeUrl ="http://tieba.baidu.com" #贴吧首页
 subUrl = "http://tieba.baidu.com/f?kw=%E4%B8%AD%E5%9B%BD%E5%A5%BD%E5%A3%B0%E9%9F%B3&ie=utf-8&pn=0" #中国好声音贴吧页面
 #childUrl="http://tieba.baidu.com/p/5825125387" #中国好声音贴吧第一条

 #存储csv文件路径
 outputFilePath = "E:\script\python-script\laidutiebapapa\csvfile_output.csv"

 def GetWebPageSource(url):

     values = {}
     data = parse.urlencode(values).encode('utf-8')

     # header
     user_agent = ""
     headers = {'User-Agent':user_agent,'Connection':'keep-alive'}

     # 声明cookie 声明opener
     cookie_filename = 'cookie.txt'
     cookie = http.cookiejar.MozillaCookieJar(cookie_filename)
     handler = urllib.request.HTTPCookieProcessor(cookie)
     opener = urllib.request.build_opener(handler)

     # 声明request
     request=urllib.request.Request(url, data, headers)
     # 得到响应
     response = opener.open(request)
     html=response.read().decode('utf-8')
     # 保存cookie
     cookie.save(ignore_discard=True,ignore_expires=True)

     return  html

     # 将读取的内容写入一个新的csv文档
 # 主函数
 if __name__ == "__main__":
     #outputString = []
     maxSubPage=2 #中国好声音贴吧翻几页设置？
     m=0#起始页数
     with open("E:\script\python-script\laidutiebapapa\csvfile_output.csv", "w", newline="", encoding='utf-8') as datacsv:
         headers = ['title', 'url', 'comment']
         csvwriter = csv.writer(datacsv, headers)
         for n in range(1, int(maxSubPage)):
             subUrl = "http://tieba.baidu.com/f?kw=%E4%B8%AD%E5%9B%BD%E5%A5%BD%E5%A3%B0%E9%9F%B3&ie=utf-8&pn=" + str(m) + ".html"
             print(subUrl)
             subhtml = GetWebPageSource(subUrl)
             #print(html)
             # 利用BeatifulSoup获取想要的元素
             subsoup = BeautifulSoup(subhtml, "lxml")
             #打印中国好声音贴吧页标题
             print(subsoup.title)
             #打印中国好声音第一页贴吧标题
             all_titles = subsoup.find_all('div', class_="threadlist_title pull_left j_th_tit ")  # 提取有关与标题
             for title in all_titles:
                 print('--------------------------------------------------')
                 print("贴吧标题："+title.get_text())#贴吧各标题题目
                 commentUrl = str(title.a['href'])
                 #print(commitment)
                 #评论页循环需要改改，maxchildpage
                 childPage = 1#评论页翻页变量
                 maxChildPage = 6#【变量】几页就翻几页设置？
                 for n in range(1, int(maxChildPage)):
                     childUrl = "http://tieba.baidu.com" + commentUrl +"?pn=" + str(childPage)
                     print("贴吧Url："+childUrl)
                     childhtml = GetWebPageSource(childUrl)
                     childsoup = BeautifulSoup(childhtml, "lxml")
                     all_comments = childsoup.find_all('div', class_="d_post_content_main")  # 提取有关与评论
                     for comment in all_comments:
                         print("用户评论：" + comment.get_text())  # 贴吧各标题题目
                         #outputString.append([title.get_text(), childUrl, comment.get_text()])
                         csvwriter.writerow([title.get_text(), childUrl, comment.get_text()])
                     print('--------------------------------------------------')
                     childPage = childPage + 1
                 m = m + 50  # 翻页控制，通过观察发现，每页相差50

跑完了成果图

csv文档中效果

上方生成的csv文件通过txt记事本打开另存为ANIS编码方式，然后在通过csv打开就不会再乱码了，解决csv打开乱码问题相关可以参考博文：https://www.cnblogs.com/zhuzhubaoya/p/9675203.html

----------------------------------------------------------------------------------------

升级版-待完善代码：

# coding=utf-8
import csv
import random
import io
from urllib import request,parse,error
import http.cookiejar
import urllib
import re
from bs4 import BeautifulSoup

# 爬爬网址
#homeUrl ="http://tieba.baidu.com" #贴吧首页
subUrl = "http://tieba.baidu.com/f?kw=%E4%B8%AD%E5%9B%BD%E5%A5%BD%E5%A3%B0%E9%9F%B3&ie=utf-8&pn=0" #中国好声音贴吧页面
#childUrl="http://tieba.baidu.com/p/5825125387" #中国好声音贴吧第一条

#存储csv文件路径
outputFilePath = "F:\Python\scripts\pestpapa\csvfile_output.csv"

def GetWebPageSource(url):

    values = {}
    data = parse.urlencode(values).encode('utf-8')

    # header
    user_agent = ""
    headers = {'User-Agent':user_agent,'Connection':'keep-alive'}

    # 声明cookie 声明opener
    cookie_filename = 'cookie.txt'
    cookie = http.cookiejar.MozillaCookieJar(cookie_filename)
    handler = urllib.request.HTTPCookieProcessor(cookie)
    opener = urllib.request.build_opener(handler)

    # 声明request
    request=urllib.request.Request(url, data, headers)
    # 得到响应
    response = opener.open(request)
    html=response.read().decode('utf-8')
    # 保存cookie
    cookie.save(ignore_discard=True,ignore_expires=True)

    return  html

    # 将读取的内容写入一个新的csv文档
# 主函数
if __name__ == "__main__":
    #outputString = []
    maxSubPage=2 #中国好声音贴吧翻几页设置？
    m=0#起始页数
    with open("F:\Python\scripts\pestpapa\csvfile_output.csv", "w", newline="", encoding='utf-8') as datacsv:
        headers = ['title', 'url', 'comment']
        csvwriter = csv.writer(datacsv, headers)
        for n in range(1, int(maxSubPage)):
            subUrl = "http://tieba.baidu.com/f?kw=%E4%B8%AD%E5%9B%BD%E5%A5%BD%E5%A3%B0%E9%9F%B3&ie=utf-8&pn=" + str(m) + ".html"
            print(subUrl)
            subhtml = GetWebPageSource(subUrl)
            #print(html)
            # 利用BeatifulSoup获取想要的元素
            subsoup = BeautifulSoup(subhtml, "lxml")
            #打印中国好声音贴吧页标题
            print(subsoup.title)
            #打印中国好声音第一页贴吧标题
            all_titles = subsoup.find_all('div', class_="threadlist_title pull_left j_th_tit ")  # 提取有关与标题
            for title in all_titles:
                print('--------------------------------------------------')
                print("贴吧标题："+title.get_text())#贴吧各标题题目
                commentUrl = str(title.a['href'])
                #print(commitment)
                #评论页循环需要改改，maxchildpage
                childPage = 1#评论页翻页变量
                maxChildPage = 6#【变量】几页就翻几页设置？
                csvwriter.writerow(['title', 'url', 'comment'])
                for n in range(1, int(maxChildPage)):
                    childUrl = "http://tieba.baidu.com" + commentUrl +"?pn=" + str(childPage)
                    print("贴吧Url："+childUrl)
                    childhtml = GetWebPageSource(childUrl)
                    childsoup = BeautifulSoup(childhtml, "lxml")
                    #all_comments = childsoup.find_all('div', class_="d_post_content_main")  # 提取有关与评论
                    allCommentList = childsoup.find_all('div', class_="l_post_bright")
                    for n in allCommentList:

                        authorName = n.find_all('li', class_="d_name")
                        for i in authorName:#写成for循环可以规避报错，如果有，走0条，不会报错。
                            print("作者：" + i.get_text().strip())
                        authorLev = n.find_all('div', class_="d_badge_lv")
                        for i in authorLev:
                            print("等级：" + i.get_text().strip())

                        all_comments = n.find_all('div', class_="d_post_content_main")
                        for comment in all_comments:
                            print("评论：" + comment.get_text().strip())
                            csvwriter.writerow([title.get_text(), childUrl, comment.get_text()])
                        print('--------------------------------------------------')
                    childPage = childPage + 1
                m = m + 50  # 翻页控制，通过观察发现，每页相差50

————————————————————————————————————————————————————————————————————————————

完善后代码：

# coding=utf-8
import csv
from urllib import request,parse
import http.cookiejar
import urllib
from bs4 import BeautifulSoup

# 爬爬网址
#homeUrl ="http://tieba.baidu.com" #贴吧首页
subUrl = "http://tieba.baidu.com/f?kw=%E4%B8%AD%E5%9B%BD%E5%A5%BD%E5%A3%B0%E9%9F%B3&ie=utf-8&pn=0" #中国好声音贴吧页面
#childUrl="http://tieba.baidu.com/p/5825125387" #中国好声音贴吧第一条

#存储csv文件路径
outputFilePath = "E:\script\python-script\laidutiebapapa\csvfile_output.csv"

def GetWebPageSource(url):

    values = {}
    data = parse.urlencode(values).encode('utf-8')

    # header
    user_agent = ""
    headers = {'User-Agent':user_agent,'Connection':'keep-alive'}

    # 声明cookie 声明opener
    cookie_filename = 'cookie.txt'
    cookie = http.cookiejar.MozillaCookieJar(cookie_filename)
    handler = urllib.request.HTTPCookieProcessor(cookie)
    opener = urllib.request.build_opener(handler)

    # 声明request
    request=urllib.request.Request(url, data, headers)
    # 得到响应
    response = opener.open(request)
    html=response.read().decode('utf-8')
    # 保存cookie
    cookie.save(ignore_discard=True,ignore_expires=True)

    return  html

#打印子贴吧评论区
def PrintUserComment(childUrl):
    childhtml = GetWebPageSource(childUrl)
    childsoup = BeautifulSoup(childhtml, "lxml")

    allCommentList = childsoup.find_all('div', class_="l_post_bright")
    for n in allCommentList:
        print('--------------------------------------------------')
        authorName = n.find_all('li', class_="d_name")
        for i in authorName:  # 写成for循环可以规避报错，如果有，走0条，不会报错。
            authorName = i.get_text().strip()
            print("作者：" + authorName)
        authorLev = n.find_all('div', class_="d_badge_lv")
        for i in authorLev:
            authorLev = i.get_text().strip()
            print("等级：" + authorLev)

        all_comments = n.find_all('div', class_="d_post_content_main")
        for comment in all_comments:
            commentRes = comment.get_text()
            print("评论：" + comment.get_text().strip())
            csvwriter.writerow([titleName, childUrl, authorName, authorLev, commentRes])
        print('--------------------------------------------------')

# 主函数
if __name__ == "__main__":

    # 几个控制变量初值定义
    m = 0  # 起始页数
    maxSubPage = 2  # 中国好声音贴吧翻几页设置？
    maxChildPage = 6  # 【变量】几页就翻几页设置？

    # 开始遍历贴吧内容，顺序：父贴吧-子贴吧-评论区，并将以下子贴吧评论内容写入csv文件
    with open("E:\script\python-script\laidutiebapapa\csvfile_output.csv", "w", newline="", encoding='utf-8') as datacsv:
        headers = []
        csvwriter = csv.writer(datacsv, headers)

        # 父贴吧页面处理
        for n in range(1, int(maxSubPage)):
            subUrl = "http://tieba.baidu.com/f?kw=%E4%B8%AD%E5%9B%BD%E5%A5%BD%E5%A3%B0%E9%9F%B3&ie=utf-8&pn=" + str(m) + ".html"# 父贴吧链接
            print(subUrl)
            subhtml = GetWebPageSource(subUrl)
            subsoup = BeautifulSoup(subhtml, "lxml")
            print(subsoup.title)# 打印父贴吧标题

            # 遍历父贴吧下子贴吧标题
            all_titles = subsoup.find_all('div', class_="threadlist_title pull_left j_th_tit ")  # 提取有关与标题
            for title in all_titles:
                titleName = title.get_text()
                print("贴吧标题："+titleName)# 打印中国好声音父贴吧页各子贴吧title
                commentUrl = str(title.a['href'])# 取子贴吧网址链接规律值'href'
                csvwriter.writerow(['贴吧标题', '链接', '用户姓名', '用户等级', '评论'])# 定义打印评论csv文件标题行

                childPage = 1  # 评论页翻页变量
                # 遍历子贴吧下评论页
                for n in range(1, int(maxChildPage)):
                    childUrl = "http://tieba.baidu.com" + commentUrl +"?pn=" + str(childPage)
                    print("贴吧Url："+childUrl)

                    # 打印子贴吧评论区
                    PrintUserComment(childUrl)
                    childPage = childPage + 1
                m = m + 50  # 翻页控制，通过观察发现，每页相差50

运行后效果：

自动生成csv效果（如果乱码需要按照上面的方法进行转码后再打开就OK了）：