from selenium import webdriver
from selenium.webdriver.common.keys import Keys

path_to_chromedriver = 'C:/Users/Kyle/Desktop/chromedriver' # change path as needed
browser = webdriver.Chrome(executable_path = path_to_chromedriver)
url = 'http://library.universityname.edu/corpaffils'
browser.get(url)

username = selenium.find_element_by_id("login_id")
password = selenium.find_element_by_id("login_password")

username.send_keys("my username")
password.send_keys("my password")

selenium.find_element_by_name("submit").click()

<li><label for="login_id">ID:</label><input id="login_id" placeholder="ID" type="text" NAME="user" SIZE="20" VALUE=""/></li>
...
...
<li><label for="login_password">Password:</label><input id="login_password" placeholder="Password" type="password" NAME="pass" SIZE="20" /></li>
...
...
<ul class="submit">
<li><input type="SUBMIT" name="submit" value="Sign in"></li>
</ul>