code: def get_setting(name, app=None):
      
      default_value = DEFAULT_SETTINGS.get(name, None)
      return app.config.get(name, default_value) if app else default_value
docs: Returns the value for `name` settings (looks into `app` config, and into
      DEFAULT_SETTINGS). Returns None if not set.
  
      :param name: (str) name of a setting (e.g. FLASKS3_URL_STYLE)
  
      :param app: Flask app instance
  
      :return: setting value or None