Python Requests Refresh

Question

I'm trying to use python's requests library to log in to a website. It's a pretty simple code, and you can really get the gist of requests just by going on its website. I, however, want to check if I'm successfully logged in via the url. The problem I've encountered is when I initiate the post requests and give it (the variable p) a url, whether the html has changed or not I'm still passed the same url when I type print(p.url). Is there any way for me to refresh the browser or update the url to whatever it's currently set at?

(I can add a line for checking the url against itself later, but for now I just want to get the correct url)

#!usr/bin/env python3


import requests

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

with requests.Session() as s:
    p = s.post('WEBSITE', data=payload)
    #print p.text
    print(p.url)