How to use python,requests to login to a website?

Question

Python

I have been trying for the second day to write an authorization that works on this site. On others it works, but on this I don’t even see the reason for the failure. The site is powered by moodle.

import requests
from bs4 import BeautifulSoup

headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.125 Safari/537.36'}

login_data = {'anchor': None,
              'logintoken': None,
              'username': 'guest',
              'password': 'guest'
              }

with requests.Session() as s:
    url = 'http://www.uetk-spo.ru/login/index.php'
    r = s.get(url, headers=headers)
    soup = BeautifulSoup(r.content, 'html5lib')
    login_data['logintoken'] = soup.find(
        'input', attrs={'name': 'logintoken'})['value']
    f = s.post(url, data=login_data, headers=headers)
    print(f.content)

Answer 1

And what is wrong? The script successfully logs in. It remains to save the received cookies and pass them in subsequent requests.