Request URL: http://xxxx/login.pl

Request Method: POST

Status Code: 200 OK

userid:xxx

password:xxx

login:Login

import urllib.request
import requests
from bs4 import BeautifulSoup

# OPTIONS
USERNAME = 'xxx'
PASSWORD = 'xxx'

payload = {'userid': USERNAME,
           'password': PASSWORD,
           'login': 'Login'
          }

session = requests.Session()
print(payload)
r = session.post('http://xxx/login.pl', data=payload)
print(r2.text)