import json

 import requests

 import io

 url="http://www.beijing.gov.cn/hudong/hdjl/com.web.search.mailList.mailList.biz.ext"

 kv = {

     'Host': 'www.beijing.gov.cn',

     'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:71.0) Gecko/20100101 Firefox/71.0',

     'Accept': 'application/json, text/javascript, */*; q=0.01',

     'Accept-Language': 'zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2',

     'Accept-Encoding': 'gzip, deflate',

     'Content-Type': 'text/json',

     'X-Requested-With': 'XMLHttpRequest',

     'Content-Length': '',

     'Origin': 'http://www.beijing.gov.cn',

     'Connection': 'keep-alive',

     'Referer': 'http://www.beijing.gov.cn/hudong/hdjl/'}

 def page(begin):

     query={

     'PageCond/begin': begin,

     'PageCond/isCount':'true',

     'PageCond/length':6,

     }

     datas=json.dumps(query)

     r=requests.post(url,data=datas,headers=kv)

     print(r.status_code)

     print(r.text)

     js=json.loads(r.text)

     for j in js["mailList"]:

         print(j)

         print(j.get("original_id"))

 def href():

     begin=0

     for i in range(0,5584):

         if i%6==0:

             page(i)

             #print(begin)

 if __name__=="__main__":

     href()