Python 2.7.5 (default, Oct 11 2015, 17:47:16)
[GCC 4.8.3 20140911 (Red Hat 4.8.3-9)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

[hkeyland@localhost Escritorio]$ python testa.py

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

########################################
"""USER AUTH"""
username="user"
password="password"
########################################

########################################
"""LOGIN"""
driver = webdriver.Firefox()
driver.set_window_size(1024,800)
driver.get("https://www_hackthissite_org/missions/prog/2/index.php")
element = driver.find_element_by_name('username')
element.send_keys(username)
element2 = driver.find_element_by_name("password")
element2.send_keys(password)
element3 = driver.find_element_by_name("btn_submit")
element3.click()
########################################