input: Write a function to automate the login process in a given website using Selenium in Python. The function should initialize the web driver, navigate to the target website, enter the username and password, click the submit button, and print a success message if the login is successful.
  
  def automate_login(url, username_value, password_value):
      from selenium import webdriver
      from selenium.webdriver.common.keys import Keys
      import time
  
      # Initialize web driver
      driver = webdriver.Chrome()
  
      # Navigate to the target web page
      driver.get(url)
  
      # Locate username field
      username = driver.find_element_by_name('username')
  
      # Enter username
      username.send_keys(username_value)
  
      # Locate password field
      password = driver.find_element_by_name('password')
  
      # Enter password
      password.send_keys(password_value)
  
      # Locate submit button
      submit_button = driver.find_element_by_name('submit')
  
      # Click submit button
      submit_button.click()
  
      # Wait for login process to complete
      time.sleep(5)
  
      # Login successful
      print('Login successful!')
  
      driver.close()
  
  assert automate_login('http://www.example.com', 'username', 'password')=='Login successful!'
  assert automate_login('http://www.sample.com', 'testuser', 'testpass')=='Login successful!'
  assert automate_login('http://www.demo.com', 'user123', 'pass123')=='Login successful!'
output: def automate_login(url, username_value, password_value):
      from selenium import webdriver
      from selenium.webdriver.common.keys import Keys
      import time
  
      driver = webdriver.Chrome()
      driver.get(url)
      username = driver.find_element_by_name('username')
      username.send_keys(username_value)
      password = driver.find_element_by_name('password')
      password.send_keys(password_value)
      submit_button = driver.find_element_by_name('submit')
      submit_button.click()
      time.sleep(5)
      print('Login successful!')
      driver.close()