小白爬取单个微博用户的评论
一、简要介绍
对“深圳移动”微博用户爬取所有微博及其评论。
二、工具介绍
语言：python 2.7
使用的库：import requests
微博账号：网上购买若干
IP代理：网上租动态IP的代理服务器
User-agent：网上搜索若干
三、整体思路
1.首先找到“深圳移动”的手机微博页面
https://m.weibo.cn/u/1922826034
2. 手机微博看不到翻页，是一直往下加载的（一共1671页），但是其json格式的数据仍然以翻页的形式呈现。
https://m.weibo.cn/api/container/getIndex?type=uid&value=1922826034&containerid=1076031922826034&page=2
主要就是修改page后面的值来获取手机微博每个页面的json数据。
3. 从上面的json数据页面获取字段idstr，即微博id。
从https://m.weibo.cn/status/4177994643916324地址可以获取一条微博的手机页面。
格式：https://m.weibo.cn/status/【id】
4. 从https://m.weibo.cn/api/comments/show?id=4131150395559419&page=1
地址可以获取一条微博的评论的json格式数据，id为一条微博的id，page为评论翻页。
格式：https://m.weibo.cn/api/comments/show?id=【id】&page=【page_num】
首行若ok=1说明该条微博有评论；若ok=0说明该条微博没有评论。
四、代码实现
1.设置user-agent、cookies、headers。
从网上获取大量user-agent，在TAOBAO购买若干微博账号，获取其cookie。
Random.choice()函数从列表中每次随机获取一个值，避免短时间内用同一个cookie或者同一个user-agent访问微博页面导致cookie或user-agent被封。
2.获取微博每一页json数据，提取其中的idstr字段得到每条微博的id。
Time.sleep(random.randint(1,4)) 休眠时间是随机数而非固定值。
3.同样的道理从评论的json页面获取评论的json数据。
五、知识反馈
1.时间久了之后会出现NO JSON COULD BE DECODED的错误，debug后发现是获取不到页面源码返回response 404的错误，原因是user-agent使用次数过多被禁，主要是因为使用了单一IP地址，在这里我用的是动态IP地址的服务器，因此不需要在爬虫中设置代理IP，设置代理IP的方法和random.choice( )设置user-agent的方法雷同。此外，尽管使用了动态IP，user-agent仍有被禁的可能。
关于反爬虫如何禁止user-agent抓取网站的办法：
来源：《Nginx反爬虫攻略：禁止某些User Agent抓取网站》
2.爬取的数据过多时，需要有代码可以自动更新微博账号的cookie。
六、参考资料
对本次数据爬取有重要贡献的参考文章：《pyhton微博爬虫（3）——获取微博评论数据》
http://blog.csdn.net/FlySky1991/article/details/76924443
七、只有自己能看懂的代码
1 #!/usr/bin/env python 2 # -*- coding: utf-8 -*- 3 import sys 4 5 import requests 6 7 reload(sys) 8 sys.setdefaultencoding('utf8') 9 import time 10 import random 11 import crawler.user_agents as ua 12 from crawler import cookies as ck 13 14 15 def writeintxt(list,filename): 16 output = open(filename, 'a') 17 for i in list: 18 output.write(str(i[0])+','+str(i[1])+'\n') 19 output.close() 20 21 cookies = random.choice(ck.cookies) 22 user_agent = random.choice(ua.agents) 23 headers = { 24 'User-agent' : user_agent, 25 'Host' : 'm.weibo.cn', 26 'Accept' : 'application/json, text/plain, */*', 27 'Accept-Language' : 'zh-CN,zh;q=0.8', 28 'Accept-Encoding' : 'gzip, deflate, sdch, br', 29 'Referer' : 'https://m.weibo.cn/u/1922826034', 30 'Cookie' : cookies, 31 'Connection' : 'keep-alive', 32 } 33 34 id_list = [] 35 base_url = 'https://m.weibo.cn/api/container/getIndex?type=uid&value=1922826034&containerid=1076031922826034&page=' 36 for i in range(0, 1672): 37 try: 38 url = base_url+i.__str__() 39 resp = requests.get(url, headers=headers,timeout = 5) 40 jsondata = resp.json() 41 42 data = jsondata.get('cards') 43 for d in data: 44 id = d.get("mblog").get('idstr') 45 # print id 46 id_list.append([i,id]) 47 time.sleep(random.randint(1,4)) 48 except: 49 print i 50 print('*'*100) 51 pass 52 print "ok" 53 54 55 writeintxt(id_list,'weibo_id')
1 #!/usr/bin/env python 2 # -*- coding: utf-8 -*- 3 import sys 4 5 import requests 6 7 reload(sys) 8 sys.setdefaultencoding('utf8') 9 import time 10 import random 11 import crawler.user_agents as ua 12 from crawler import cookies as ck 13 14 15 def readfromtxt(filename): 16 file = open(u'D:/MattDoc/实习/1124爬取深圳移动新浪微博/网页/'+filename, "r") 17 text = file.read() 18 file.close() 19 return text 20 21 def writeintxt(dict,filename): 22 output = open(u"D:/MattDoc/实习/1124爬取深圳移动新浪微博/网页/"+filename, 'a+') 23 for d, list in dict.items(): 24 comment_str = "" 25 for l in list: 26 comment_str = comment_str + l.__str__() + "####" 27 output.write(d.split(',')[1]+"####"+comment_str+'\n') 28 output.close() 29 30 31 32 user_agent = random.choice(ua.agents) 33 cookies = random.choice(ck.cookies) 34 headers = { 35 'User-agent' : user_agent, 36 'Host' : 'm.weibo.cn', 37 'Accept' : 'application/json, text/plain, */*', 38 'Accept-Language' : 'zh-CN,zh;q=0.8', 39 'Accept-Encoding' : 'gzip, deflate, sdch, br', 40 'Referer' : 'https://m.weibo.cn/u/1922826034', 41 'Cookie' : cookies, 42 'Connection' : 'keep-alive', 43 } 44 45 46 base_url = 'https://m.weibo.cn/api/comments/show?id=' 47 weibo_id_list = readfromtxt('weibo_id1.txt').split('\n') 48 result_dict = {} 49 for weibo_id in weibo_id_list: 50 try: 51 record_list = [] 52 i=1 53 SIGN = 1 54 while(SIGN): 55 # url = base_url + weibo_id.split(',')[1] + '&page=' + str(i) 56 url = base_url + str(weibo_id) + '&page=' + str(i) 57 resp = requests.get(url, headers=headers, timeout=100) 58 jsondata = resp.json() 59 if jsondata.get('ok') == 1: 60 SIGN = 1 61 i = i + 1 62 data = jsondata.get('data') 63 for d in data: 64 comment = d.get('text').replace('$$','') 65 like_count = d.get('like_counts') 66 user_id = d.get("user").get('id') 67 user_name = d.get("user").get('screen_name').replace('$$','') 68 one_record = user_id.__str__()+'$$'+like_count.__str__()+'$$'+user_name.__str__()+'$$'+ comment.__str__() 69 record_list.append(one_record) 70 else: 71 SIGN = 0 72 73 result_dict[weibo_id]=record_list 74 time.sleep(random.randint(2,3)) 75 except: 76 # print traceback.print_exc() 77 print weibo_id 78 print('*'*100) 79 pass 80 print "ok" 81 82 writeintxt(result_dict,'comment1.txt')
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posted on 2017-11-30 10:41 Denise_hzf 阅读(11952) 评论(3) 编辑 收藏 举报
