__VIEWSTATE和__EVENTTARGET验证获取，爬取网站通讯录

from pyquery import PyQuery as pq
import requests
import csv

#首页链接单独获取，
def get_env(url="http://localhost:8080/index.htm"):
    res = requests.get (url).content
    opq = pq (res)
    return opq

#次页网站，返回验证字符串，用于下一页的获取验证
def get_content(url="http://localhost:8080/index.htm", viewstate="viewstate", enventvalidation="enventvalidation",
                tarpgnumber="2", input="1", opq=""):
    if opq = "":
        header = {
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.146 Safari/537.36"
        }
        parses = {
            "__VIEWSTATE": viewstate,
            "__EVENTTARGET": "aspNetPager1",
            "__EVENTARGUMENT": tarpgnumber,
            "__EVENTVALIDATION": enventvalidation,
            "txtPhone": "",
            "AspNetPager1_input":input,
            "hidestrWhere": ""
        }
        res = requests.post (url, data=parses, headers=header).content
        opq = pq (res)

    else:
        pass
    viewstate = opq ('input[id="__VIEWSTATE"]').attr ("value")
    enventvalidation = opq ('input[id="__EVENTVALIDATION"]').attr ("value")
#分组，9个为一列表，方便成一行写入
    listconters = []
    conters = opq ("tbody").eq (1).find ("tr").children ()
    for td in conters:
        w = td.text
        listconters.append (w)
    step = 9
    listconter = [listconters[i:i + step] for i in range (0, len (listconters), step)]
    return viewstate , enventvalidation, listconter


# writerow写一行，writerows写列表每一项为一行，newline属性可以避免多一行空白行


opq=get_env()
viewstate, enventvalidation, listconter = get_content (opq=opq)
for i in range (1, 3):
    url = "http://localhost:8080/tx.aspx"
    tarpgnumber =i
    input = i-1
    with open ("./通讯录.csv", "a", newline="") as f:
        writer = csv.writer (f)
        writer.writerows (listconter)
    viewstate, enventvalidation, listconter = get_content (url=url, viewstate=viewstate, enventvalidation=enventvalidation,
                tarpgnumber=tarpgnumber, input=input, opq="")