input: Write a function to render a web page using Python. The function should take a URL as input and use the webbrowser module to open that URL in the default web browser. If the input URL is not provided, it should open the default example URL "www.example.com".
  def render_web_page(url="www.example.com"):
      import webbrowser
      webbrowser.open(url)
  
  assert render_web_page() is None
  assert render_web_page("http://www.google.com") is None
  assert render_web_page("http://www.facebook.com") is None
output: def render_web_page(url="www.example.com"):
      import webbrowser
      webbrowser.open(url)