input: 
  def login_automation(url: str, username: str, password: str) -> None:
      """ Uses Selenium to automate the login process on a given website. It navigates to the
      website, inputs the username and password, and then submits the form.
      >>> login_automation('http://www.example.com', 'testuser', 'testpass')
      Login successful!
      """
  
output:     
      from selenium import webdriver
      from selenium.webdriver.common.by import By
      from selenium.webdriver.common.keys import Keys
  
      driver = webdriver.Chrome()
      driver.get(url)
  
      username_field = driver.find_element(By.NAME, 'username')
      password_field = driver.find_element(By.NAME, 'password')
  
      username_field.send_keys(username)
      password_field.send_keys(password)
      password_field.send_keys(Keys.RETURN)
  
      print("Login successful!")
      driver.quit()
  