python爬虫登陆request payload中参数获取问题

Question

模拟登陆饿了吗商户版的时候遇到了

这个id不知道怎么获取。
模拟登陆知乎中 from data 中有_xsrf参数，但这个id参数和_xsrf的获取方法不一样，无法从登陆界面源代码中获取

import requests

from multiprocessing.dummy import Pool as ThreadPool

from lxml import etree

import time

import random

import csv

import json

url ='https://melody.shop.ele.me/login'

formdata = {

    'id': '',

    'metas':{'appName':'melody','appVersion':'4.4.0','method':'loginByUsername','ncp':'2.0.0'},

    'params':{'captchaCode':'','loginedSessionIds':[],'password':'xxxx','username':'xxxx','service':'LoginService'}

    

}

s = requests.Session()

s.headers = {

    'User-Agent':'Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko'

}

z = s.post(url = url,data = formdata)