import requests

cred = {
    'sid': '******',
    'PIN': '********'
}
loginurl = 'https://sis.rpi.edu/rss/twbkwbis.P_WWWLogin'
requrl = 'https://sis.rpi.edu/rss/twbkwbis.P_GenMenu?name=bmenu.P_StuMainMnu'
test2 = 'https://sis.rpi.edu/rss/bwskfreg.P_AltPin' #requrl and test2 are the parts of SIS i want to go to after login
with requests.Session() as session:
    post = session.post(loginurl, data=cred)
    r = session.get(test2)
    print(r.text)