code: def google_analytics(parser, token):
      
      bits = token.split_contents()
      if len(bits) > 1:
          raise TemplateSyntaxError("'%s' takes no arguments" % bits[0])
      return GoogleAnalyticsNode()
docs: Google Analytics tracking template tag.
  
      Renders Javascript code to track page visits.  You must supply
      your website property ID (as a string) in the
      ``GOOGLE_ANALYTICS_PROPERTY_ID`` setting.