import requests
import lxml.html
from bs4 import BeautifulSoup

# URL of webpage
login_url = "https://cas.tamu.edu/cas/login?service=https://howdy.tamu.edu/uPortal/Login&renew=true"
username = # my username
password = # my password

# create a session to store cookies
sesh = requests.session()

params = {'service': howdy}
# gets the URL and converts the text of the HTML code
req = sesh.get(login_url, params=params)
html_content = req.text

print html_content

# parsing the page for hidden inputs
login_html = lxml.html.fromstring(html_content)
hidden_inputs = login_html.xpath(r'//form//input[@type="hidden"]')
user_form = {x.attrib["name"]: x.attrib["value"] for x in hidden_inputs}
print(user_form)

user_form["username"] = username
user_response = sesh.post(login_url, data=user_form)

print user_response.url

# same thing for the password page
pass_form = {x.attrib["name"]: x.attrib["value"] for x in hidden_inputs}
print(pass_form)

pass_form["password"] = password
pass_response = sesh.post(user_response.url, data=pass_form)

print pass_response.url