If you take a look at the docs, it’s pretty simple: http://docs.python-requests.org/en/latest/index.html
import requests
url = r'http://test.com/login_check.php'
parameters = {'x' : '0' ,
'y' : '0',
'url':'login.php',
'password':'1234',
'id':'userid'}
login_response = requests.get(url, params=parameters)
htmlContent = login_response.text