input: Write a function to render a web page using the webbrowser module in Python. The function should take a URL as input and open that URL in the default web browser. If no URL is provided, it should open a default URL like "www.example.com".
  
  def render_web_page(url="www.example.com"):
      import webbrowser
      webbrowser.open(url)
  
  assert render_web_page("www.google.com")==None
  assert render_web_page("www.python.org")==None
  assert render_web_page()==None
output: def render_web_page(url="www.example.com"):
      import webbrowser
      webbrowser.open(url)