docs: def generate_example(config, ext='json'):
      """Generate an example file based on the given Configuration object.
  
      Args:
          config (confpy.core.configuration.Configuration): The configuration
              object on which to base the example.
          ext (str): The file extension to render. Choices: JSON and INI.
  
      Returns:
          str: The text of the example file.
      """
      template_name = 'example.{0}'.format(ext.lower())
      template = ENV.get_template(template_name)
      return template.render(config=config)