from requests import Session
s = Session()

r = s.post("https://newt.nersc.gov/newt/auth", {"username": "myuser", "password": "XXXXXXXX"})

r.json()

newt_sessionid = r.json()['newt_sessionid']


s2 = Session()
r = s2.get("https://newt.nersc.gov/newt/auth", cookies={'newt_sessionid': newt_sessionid})

r.json()