input: Write a function to create a Selenium script in Python that automates the login process on a given website. The function should initialize a web driver, navigate to the target website, locate and fill in the username and password fields, click the submit button, and print a message confirming the login was successful. The function should accept a URL as input.
  assert create_login_script('http://www.example.com')==None
  assert create_login_script('http://www.anothersite.com')==None
output: def create_login_script(url):
      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 = driver.find_element(By.ID, 'username')
      password = driver.find_element(By.ID, 'password')
      submit_button = driver.find_element(By.ID, 'submit')
      
      username.send_keys('your_username')
      password.send_keys('your_password')
      submit_button.click()
      
      print("Login successful")
      driver.quit()