Scrapy知乎

　　# -*- coding:utf-8 -*-

　　import scrapy

　　from scrapy.http import Request

　　from ZhiHu.items import ZhihuItem

　　from ZhiHu.MysqlPipelines.Mysql import NumberCheck

　　from scrapy.conf import settings

　　from ZhiHu.settings import Tool

　　import requests

　　import json

　　class Myspider(scrapy.Spider):

　　'''初始化各种参数'''

　　name='ZhiHu'

　　allowed_domains=['zhihu']

　　L=''

　　K=''

　　All_Num=546049 # 目标抓取量,手动填入

　　Save_Num=NumberCheck.find_save() # 已经抓取量

　　DB_Num=NumberCheck.find_db_real() # 上次爬虫，数据库的最后一条数据DB_Num

　　Last_Num=NumberCheck.find_last() # 获得上一次爬虫，轮子哥关注量

　　url='zhihu/api/v4/members/excited-vczh/followers?include=data%5B*%5D.locations%2Cemployments%2Cgender%2Ceducations%2Cbusiness%2Cvoteup_count%2Cthanked_Count%2Cfollower_count%2Cfollowing_count%2Ccover_url%2Cfollowing_topic_count%2Cfollowing_question_count%2Cfollowing_favlists_count%2Cfollowing_columns_count%2Cavatar_hue%2Canswer_count%2Carticles_count%2Cpins_count%2Cquestion_count%2Ccommercial_question_count%2Cfavorite_count%2Cfavorited_count%2Clogs_count%2Cmarked_answers_count%2Cmarked_answers_text%2Cmessage_thread_token%2Caccount_status%2Cis_active%2Cis_force_renamed%2Cis_bind_sina%2Csina_weibo_url%2Csina_weibo_name%2Cshow_sina_weibo%2Cis_blocking%2Cis_blocked%2Cis_following%2Cis_followed%2Cmutual_followees_count%2Cvote_to_count%2Cvote_from_count%2Cthank_to_count%2Cthank_from_count%2Cthanked_count%2Cdescription%2Chosted_live_count%2Cparticipated_live_count%2Callow_message%2Cindustry_category%2Corg_name%2Corg_homepage%2Cbadge%5B%3F(type%3Dbest_answerer)%5D.topics&limit=20&offset=0'

　　response=requests.get(url, headers=settings['DEFAULT_REQUEST_HEADERS'])

　　parse=json.loads(response.text)

　　try:

　　# 获得最新关注者数目Now_Num,注意检验token是否过期

　　Now_Num=parse['paging']['totals']

　　# 因为关注者不时更新，需计算出真实Real_Num,分两种情况讨论

　　# 第一次DB_Num和Last_Num为None,第二次之后不为None

　　if DB_Num is not None:

　　if Last_Num is not None:

　　Real_Num=DB_Num+(Now_Num-Last_Num)-1

　　Save_Num=Save_Num

　　else:

　　Real_Num=All_Num

　　Save_Num=0

　　print u'目标爬取：', All_Num

　　print u'已经抓取：', Save_Num

　　print u''

　　print u'目前关注：',Now_Num

　　print u'上次关注：',Last_Num

　　except KeyError:

　　print u'

　　'

　　print u'Authorization过期，请停止程序，重新抓取并在settings中更新'

　　def start_requests(self):

　　#每隔20页抓一次

　　urls=['zhihu/api/v4/members/excited-vczh/followers?include=data%5B*%5D.locations%2Cemployments%2Cgender%2Ceducations%2Cbusiness%2Cvoteup_count%2Cthanked_Count%2Cfollower_count%2Cfollowing_count%2Ccover_url%2Cfollowing_topic_count%2Cfollowing_question_count%2Cfollowing_favlists_count%2Cfollowing_columns_count%2Cavatar_hue%2Canswer_count%2Carticles_count%2Cpins_count%2Cquestion_count%2Ccommercial_question_count%2Cfavorite_count%2Cfavorited_count%2Clogs_count%2Cmarked_answers_count%2Cmarked_answers_text%2Cmessage_thread_token%2Caccount_status%2Cis_active%2Cis_force_renamed%2Cis_bind_sina%2Csina_weibo_url%2Csina_weibo_name%2Cshow_sina_weibo%2Cis_blocking%2Cis_blocked%2Cis_following%2Cis_followed%2Cmutual_followees_count%2Cvote_to_count%2Cvote_from_count%2Cthank_to_count%2Cthank_from_count%2Cthanked_count%2Cdescription%2Chosted_live_count%2Cparticipated_live_count%2Callow_message%2Cindustry_category%2Corg_name%2Corg_homepage%2Cbadge%5B%3F(type%3Dbest_answerer)%5D.topics&limit=20&offset='+str(i)for i in range(0,self.Real_Num)[::-1]]

　　for url in urls:

　　yield Request(url,callback=self.parse)

　　def parse(self,response):

　　'''解析json格式数据，获得游戏拍卖平台各类数据'''

　　data=json.loads(response.text)['data']

　　i=data[0]

　　item=ZhihuItem()

　　item['Save_Num']=self.Save_Num + 1

　　item['Last_Num']=self.Now_Num

　　item['Real_Num']=self.Real_Num

　　item['name']=i['name']

　　#提取标签、个人简介中的文本,用到自定义的Tool类

　　tool=Tool()

　　item['headline']=tool.replace(i['headline'])

　　item['description']=tool.replace(i['description'])

　　item['detailURL']='zhihu/people/'+str(i['url_token'])

　　item['gender']=i['gender']

　　item['user_type']=i['user_type']

　　item['is_active']=i['is_active']

　　if len(i['locations'])==0:

　　item['locations']=''

　　else:

　　for n in i['locations']:

　　item['locations']=n['name']

　　try:

　　item['business']=i['business']['name']

　　except KeyError:

　　item['business']=''

　　#教育经历，分多种情况讨论

　　if len(i['educations'])==0:

　　item['educations']=''

　　else:

　　content=[]

　　for n in i['educations']:

　　S='school' in n.keys()

　　M='major' in n.keys()

　　if S:

　　if M:

　　self.L=n['school']['name']+'/'+n['major']['name']

　　else:

　　self.L=n['school']['name']

　　else:

　　self.L=n['major']['name']

　　content.append(self.L)

　　item['educations']=''

　　for l in content:

　　item['educations']+=l+' '

　　#职业经历，分多种情况讨论

　　if len(i['employments'])==0:

　　item['employments']=''

　　else:

　　content=[]

　　for n in i['employments']:

　　C='company' in n.keys()

　　J='job' in n.keys()

　　if C:

　　if J:

　　self.K=n['company']['name']+'/'+n['job']['name']

　　else:

　　self.K=n['company']['name']

　　else:

　　if J:

　　self.K=n['job']['name']

　　content.append(self.K)

　　item['employments']=''

　　for k in content:

　　item['employments']+=k+' '

　　item['following_count']=i['following_count']

　　item['follower_count']=i['follower_count']

　　item['mutual_followees_count']=i['mutual_followees_count']

　　item['voteup_count']=i['voteup_count']

　　item['thanked_count']=i['thanked_count']

　　item['favorited_count']=i['favorited_count']

　　item['logs_count']=i['logs_count']

　　item['following_question_count']=i['following_question_count']

　　item['following_topic_count']=i['following_topic_count']

　　item['following_favlists_count']=i['following_favlists_count']

　　item['following_columns_count']=i['following_columns_count']

　　item['articles_count']=i['articles_count']

　　item['question_count']=i['question_count']

　　item['answer_count']=i['answer_count']

　　item['pins_count']=i['pins_count']

　　item['participated_live_count']=i['participated_live_count']

　　item['hosted_live_count']=i['hosted_live_count']

　　print u'序号：', self.Real_Num

　　self.Real_Num-=1

　　return item