input: Write a function to create a web scraper using Python’s Selenium that retrieves data from an online store. The function should open a Firefox session, navigate to a specified URL, search for a given keyword, and print the names of the products displayed on the result page. If no products are found, the function should print a message indicating so.
  
  def web_scraper(url, keyword):
      from selenium import webdriver
      
      # create a new Firefox session
      driver = webdriver.Firefox()
      driver.implicitly_wait(30)
      driver.maximize_window()
      
      # navigate to the application home page
      driver.get(url)
      
      # get the search textbox
      search_field = driver.find_element_by_name("q")
      search_field.clear()
      
      # enter search keyword and submit
      search_field.send_keys(keyword)
      search_field.submit()
      
      # get the list of elements which are displayed after the search
      # currently on result page using find_elements_by_class_name
      product_list = driver.find_elements_by_class_name("product")
      
      # iterate through each element and print the text that is
      # name of the product
      if product_list:
          for product in product_list:
              print(product.text)
      else:
          print("No products found.")
      
      # close the browser window
      driver.quit()
  
  assert web_scraper("https://www.example.com/", "shoes")==None # Assuming the function prints product names to stdout
  assert web_scraper("https://www.example.com/", "pants")==None # Assuming the function prints product names to stdout
  assert web_scraper("https://www.example.com/", "nonexistent")==None # Assuming the function prints "No products found." to stdout
output: def web_scraper(url, keyword):
      from selenium import webdriver
      
      # create a new Firefox session
      driver = webdriver.Firefox()
      driver.implicitly_wait(30)
      driver.maximize_window()
      
      # navigate to the application home page
      driver.get(url)
      
      # get the search textbox
      search_field = driver.find_element_by_name("q")
      search_field.clear()
      
      # enter search keyword and submit
      search_field.send_keys(keyword)
      search_field.submit()
      
      # get the list of elements which are displayed after the search
      # currently on result page using find_elements_by_class_name
      product_list = driver.find_elements_by_class_name("product")
      
      # iterate through each element and print the text that is
      # name of the product
      if product_list:
          for product in product_list:
              print(product.text)
      else:
          print("No products found.")
      
      # close the browser window
      driver.quit()