<form method="post" action="" onsubmit="javascript:return FormSubmit();">
<div>
    <div>
        <span>username</span>
        <input size="17" type="text" id="username" name="username" tabindex="1" accesskey="n" />
    </div>
    <div>
        <span>password</span>
        <input size="17" type="password" id="password" name="password" maxlength="48" tabindex="2" accesskey="p" autocomplete="off" />
    </div>
    <div class="controls">
        <input type="submit" id="submit" accesskey="l" value="login" tabindex="4" class="button"/>
    </div>
    <!-- The following hidden field must be part of the submitted Form -->
    <input type="hidden" name="lt" value="SOME UNIQUE CODE" />
    <input type="hidden" name="_eventId" value="submit" />
    <input type="hidden" name="credentialsType" value="ldap" />
</div>
</form>

function FormSubmit()
    {
        var strUsername=document.getElementById('username').value;

        if(strUsername.length<3)
        {
            document.getElementById('msg').innerHTML='Invalid username';
            setFocus('username');
            return false;
        }

        if(strUsername.indexOf('.')>-1)
        {
            document.getElementById('msg').innerHTML='Username cannot contain '.'';
            setFocus('username');
            return false;
        }

        if(document.getElementById('password').value.length<4)
        {
            document.getElementById('msg').innerHTML='Invalid password';
            setFocus('password');
            return false;
        }

        return true;
    }

#!/usr/bin/env python

from bs4 import BeautifulSoup
from selenium import webdriver
import requests


def main():

    cfg = get_config('config.ini')
    driver = webdriver.Firefox(executable_path="/usr/local/bin/geckodriver")
    driver.get("https://" + cfg['URL']['LOGIN'])

    username = driver.find_element_by_id("username")
    password = driver.find_element_by_id("password")

    username.send_keys(cfg['CREDENTIALS']['USERNAME'])
    password.send_keys(cfg['CREDENTIALS']['PASSWORD'])

    form = driver.find_element_by_tag_name("form")
    form.submit()

if __name__ == "__main__":
    main()

Traceback (most recent call last):
  File "/home/user/PyCharmProjects/project/code/run.py", line 59, in <module>
    main()
  File "/home/user/PyCharmProjects/project/code/run.py", line 25, in main
    form.submit()
  File "/home/user/PyCharmProjects/project/venv/lib/python3.5/site-packages/selenium/webdriver/remote/webelement.py", line 89, in submit
    "if (arguments[0].dispatchEvent(e)) { arguments[0].submit() }", form)
  File "/home/user/PyCharmProjects/project/venv/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py", line 627, in execute_script
    'args': converted_args})['value']
  File "/home/user/PyCharmProjects/project/venv/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py", line 312, in execute
    self.error_handler.check_response(response)
  File "/home/user/PyCharmProjects/project/venv/lib/python3.5/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.JavascriptException: Message: TypeError: arguments[0].submit is not a function