Python作为一个高级编程语言，不知从何时起就在圈子里流行起来了。个人也是图个鲜，跟上时代步伐学习了一下。“鲁迅”说过：不能学以致用，就是耍流氓。我用python对虎扑论坛作了一个爬虫。脚本写的糙了点，权作初学者交流使用，同时也方便以后查阅。本来是准备写一个虎扑的分析帖子，可后来动力不足就没有写成了。不过，作为一个马刺球迷很荣幸我们的组织是热度前三。
准备工作：安装Python、安装MySQL、虚拟机【选择性，后期将每日放在服务器上执行定时任务使用】
1、安装python：选择3.*，过程忽略
2、安装MySQL：选择5.6版本及以上，过程忽略
3、虚拟机：linux系列，过程忽略
需求描述
爬取虎扑论坛帖子，了解帖子内容、作者、热度等。
写脚本
一共分为三部分：part1通过对当前链接进行分析，提取帖子作者、阅读的信息；part2取得帖子本身的内容；part3对发帖人进行数据提取，为后期分析提供思路。具体的脚本如下。需要注意的是：编码、编码、编码。谢谢！
注：由于虎扑的反爬虫导致可细分论坛的可读取页面数为10（突破防御失败，谢谢！）这种情况下，我的处理方式是将脚本放入服务器中每日爬取进行累积。
Part1：爬取帖子的名称、作者、创建时间、阅读/回复、作者链接等，并放入本地MySQL数据库
# -*- coding: utf-8 -*-
from bs4 import BeautifulSoup
import requests
import json
import time
import pymysql
import importlib,sys
importlib.reload(sys)
forum_note_sum=[] #variavle：save the content of tiezi
list_d=[‘原创‘,‘翻译‘,‘讨论‘] #内容判断条件，如果帖子标题内容为此，取另一个值
type = sys.getfilesystemencoding()
#num:the record number of one page；get tiezi of author and others
def parent_li_web(num):
forum_note_record = {}
try:
parent_tiezi=bs_obj.find(‘ul‘,class_=‘for-list‘).find_all(‘li‘)[num]
div_one = parent_tiezi.find(‘div‘, class_=‘titlelink box‘)
div_two = parent_tiezi.find(‘div‘, class_=‘author box‘)
span_three = parent_tiezi.find(‘span‘, class_=‘ansour box‘).string.strip()
div_four = parent_tiezi.find(‘div‘, class_=‘endreply box‘)
subname=div_one.a.string
sublink=‘https://bbs.hupu.com‘+div_one.a[‘href‘]
team_tmp=theme_tmp
for i in list_d:
if i==subname:
subname=div_one.find_all(‘a‘)[1].string
sublink=‘https://bbs.hupu.com‘+div_one.find_all(‘a‘)[1][‘href‘]
# print (i,subname,sublink)
forum_note_record.update({
‘subname‘:subname,
‘subname_link‘:sublink,
‘author‘:div_two.a.string,
‘author_link‘:div_two.a[‘href‘],
‘author_create_time‘:div_two.find(‘a‘,style=‘color:#808080;cursor: initial; ‘).string,
‘read_reply_number‘:span_three,
‘last_reply_writer‘:div_four.span.string,
‘last_reply_time‘:div_four.a.string,
‘team_tmp‘:team_tmp
})
forum_note_sum.append(forum_note_record)
except:
return None
if __name__==‘__main__‘:
# all_spurs_note
begin_time=time.time()
print(‘---------脚本执行时间为：{}------------‘.format(time.strftime(‘%Y-%m-%d %H:%M:%S‘,time.localtime())))
team_list = [‘rockets‘, ‘warriors‘, ‘cavaliers‘, ‘spurs‘, ‘lakers‘, ‘celtics‘, ‘thunder‘, ‘clippers‘,
‘timberwolves‘, ‘mavericks‘, ‘knicks‘, ‘bulls‘, ‘nets‘, ‘sixers‘, ‘jazz‘, ‘pacers‘, ‘blazers‘, ‘heat‘,
‘suns‘, ‘grizzlies‘, ‘wizards‘, ‘pelicans‘, ‘bucks‘, ‘kings‘, ‘raptors‘, ‘nuggets‘, ‘hawks‘, ‘hornets‘,
‘pistons‘, ‘magic‘]
for li in team_list:
forum_note_sum_code=[]
theme_tmp=li
for i in range(1,11,1): #由于虎扑反爬，只能爬到10页；后续可放入linux中定时执行
url = ‘https://bbs.hupu.com/{}-{}‘.format(li,i)
print (url)
wb_string = requests.get(url)
bs_obj = BeautifulSoup(wb_string.content, ‘html.parser‘)
with open(‘web_spider_original.txt‘,‘w‘,encoding=‘utf8‘) as f:
f.write(str(bs_obj))
f.write(‘\r‘*10+‘-----我是分割线-----‘+‘\r‘*10)
for j in range(1,61,1): #每个页面数据有60个帖子
parent_li_web(j)
with open(‘hupu_spider_spurs_load.txt‘, ‘w‘, encoding=‘utf8‘) as f:
for item in forum_note_sum:
json.dump(item,f,ensure_ascii=False)
f.write(‘\r‘)
#insert into mysql
conn=pymysql.connect(host=‘localhost‘,user=‘root‘,passwd=‘1234‘,db=‘spider‘,port=3306,charset=‘utf8‘)
cur=conn.cursor()
cur.execute(‘delete from hupuforum_spurs_note_daytmp‘)
with open(‘hupu_spider_spurs_load.txt‘,‘r‘,encoding=‘utf8‘) as f:
for item in f:
item=json.loads(item) #how convert string to dict
# print(type(item))
cur.execute(‘insert into hupuforum_spurs_note_daytmp(subname,subname_link,author,author_link,author_create_time,read_reply_number,last_reply_writer,last_reply_time,theme_title) values(%s,%s,%s,%s,%s,%s,%s,%s,%s)‘,(item[‘subname‘],item[‘subname_link‘],item[‘author‘],item[‘author_link‘],item[‘author_create_time‘],item[‘read_reply_number‘],item[‘last_reply_writer‘],item[‘last_reply_time‘],item[‘team_tmp‘]))
conn.commit()
cur.close()
conn.close()
print(‘Finished!本次执行消耗时间为：{}秒‘.format(time.time()-begin_time))
Part2：增加贴子内容并更新部分字段
# coding=utf8 import time import requests from bs4 import BeautifulSoup import pymysql import signal begin_time=time.strftime(‘%Y-%m-%d %H:%M:%S‘,time.localtime()) conn=pymysql.connect(host=‘localhost‘,port=3306,user=‘root‘,passwd=‘1234‘,db=‘spider‘,charset=‘utf8‘) cur=conn.cursor() sub_cur = conn.cursor() cur.execute(‘INSERT INTO hupuforum_spurs_note SELECT * FROM hupuforum_spurs_note_daytmp WHERE subname_link NOT IN (SELECT a.subname_link FROM hupuforum_spurs_note a);‘) cur.execute(‘update hupuforum_spurs_note a,hupuforum_spurs_note_daytmp b set a.read_reply_number=b.read_reply_number,a.last_reply_writer=b.last_reply_writer,a.last_reply_time=b.last_reply_time where a.subname_link=b.subname_link ‘) # conn.commit() cur.execute(‘use spider;‘) conn.commit() cur.execute(‘select subname_link from hupuforum_spurs_note where sub_text is null;‘) for url in cur.fetchall(): url=list(url) # print(url) try: wb_page = requests.get(url[0],timeout=2) #实际执行中，存在网页假死状态，设置超时 bs_obj = BeautifulSoup(wb_page.content, ‘html.parser‘) tmp_text = bs_obj.select(‘#tpc > div > div.floor_box > table.case > tbody > tr > td > div.quote-content‘) sub_text=tmp_text[0].get_text(strip=True) sub_text=sub_text.replace(‘\‘‘,‘’‘) sql="""update hupuforum_spurs_note set sub_text=\‘{}\‘ where subname_link={};""".format((sub_text[:1000]),str(url).replace(‘[‘,‘‘).replace(‘]‘,‘‘)) # print(sql) sub_cur.execute(sql) conn.commit() print(‘success‘) except IndexError as e: #这个错误意味着页面也不存在 sql="""update hupuforum_spurs_note set sub_text=\‘{}\‘ where subname_link={};""".format(‘网页不存在‘,str(url).replace(‘[‘,‘‘).replace(‘]‘,‘‘)) sub_cur.execute(sql) conn.commit() except pymysql.err.InternalError as e: #说明内容中包含emoj等utf8四字符内容 sql="""update hupuforum_spurs_note set sub_text=\‘{}\‘ where subname_link={};""".format(‘内容格式有误，导致出错！‘,str(url).replace(‘[‘,‘‘).replace(‘]‘,‘‘)) sub_cur.execute(sql) conn.commit() except requests.exceptions.ReadTimeout as e: #网页响应超时 sql="""update hupuforum_spurs_note set sub_text=\‘{}\‘ where subname_link={};""".format(‘网页打开超时‘,str(url).replace(‘[‘,‘‘).replace(‘]‘,‘‘)) sub_cur.execute(sql) conn.commit() else: sql="""update hupuforum_spurs_note set sub_text=\‘{}\‘ where subname_link={};""".format(‘其他类型错误‘,str(url).replace(‘[‘,‘‘).replace(‘]‘,‘‘)) sub_cur.execute(sql) conn.commit() conn.commit() cur.close() sub_cur.close() conn.close() end_time=time.strftime(‘%Y-%m-%d %H:%M:%S‘,time.localtime()) print(‘Finished，任务开始时间为：{}，结束时间为：{}‘.format(begin_time,end_time))
Part3：爬取注册用户信息
# coding=utf8 import time import requests from bs4 import BeautifulSoup import pymysql begin_time=time.strftime(‘%Y-%m-%d %H:%M:%S‘,time.localtime()) conn=pymysql.connect(host=‘localhost‘,port=3306,user=‘root‘,passwd=‘1234‘,db=‘spider‘,charset=‘utf8‘) cur=conn.cursor() sub_cur=conn.cursor() cur.execute(‘select distinct author_link from hupuforum_spurs_note;‘) for author_url in cur.fetchall(): try: author_url=list(author_url) wb_obj=requests.get(author_url[0],timeout=2) bs_obj=BeautifulSoup(wb_obj.content,‘html.parser‘) author=bs_obj.select(‘#main > div.personal > div.personal_right > h3 > div‘)[0].string author_visited=bs_obj.select(‘#main > div.personal > div.personal_right > h3 > span‘)[0].string.replace(‘有‘,‘‘).replace(‘人次访问‘,‘‘) author_info=bs_obj.select(‘#main > div.personal > div.personal_right > div‘)[0].get_text(strip=True) sub_cur.execute(‘insert into hupuforum_authors_info(author,author_link,author_visited,author_info,author_status) values(%s,%s,%s,%s,%s)‘,(author,author_url[0],author_visited,author_info,‘正常‘)) except IndexError as e: sub_cur.execute( ‘insert into hupuforum_authors_info(author,author_link,author_visited,author_info,author_status) values(%s,%s,%s,%s,%s)‘, (author, author_url[0], ‘‘, ‘‘, ‘无法访问‘)) conn.commit() conn.commit() cur.close() conn.close() end_time=time.strftime(‘%Y-%m-%d %H:%M:%S‘,time.localtime()) print(‘Finished，任务开始时间为：{}，结束时间为：{}‘.format(begin_time,end_time))