import requests
from bs4 import BeautifulSoup
import urllib.request


with requests.Session() as c:
    url = "https://cas.uni-mannheim.de/cas/login?service=https%3A%2F%2Fportal2.uni-mannheim.de/portal2/rds%3Fstate%3Duser%26type%3D1"
    USERNAME = ""
    PASSWORD = ""
    EXECUTION ="e1s1"
    EVENTID = "submit"
    SUBMIT = "Anmelden"

    c.get(url)
    pager = urllib.request.urlopen(url)
    soup = BeautifulSoup(pager,"html.parser")

    temp_LT = soup.find(id="lt")
    string_LT = str(temp_LT)
    LT=string_LT[46:-3]
    login_data = dict(username=USERNAME, password=PASSWORD,lt=LT, execution=EXECUTION,_eventId=EVENTID, submit=SUBMIT)
    print(c.cookies.get_dict().get("JSESSIONID"));
   # c.post(url,data=login_data, headers={"Referer": "https://cas.uni-mannheim.de/cas/login?service=https%3A%2F%2Filias.uni-mannheim.de%2Filias.php%3FbaseClass%3DilPersonalDesktopGUI%26cmd%3DjumpToSelectedItems"})
    c.post(url=url,data=login_data,cookies=c.cookies.get_dict())
    page = c.get("https://cas.uni-mannheim.de/cas/login?service=https%3A%2F%2Fportal.uni-mannheim.de%2Fqisserveriframe%2Frds%3Fstate%3Duser%26type%3D1%26topitem%3Dpruefungen%26language%3Dde")
    print(page.text)