code: def mixpanel(parser, token):
      
      bits = token.split_contents()
      if len(bits) > 1:
          raise TemplateSyntaxError("'%s' takes no arguments" % bits[0])
      return MixpanelNode()
docs: Mixpanel tracking template tag.
  
      Renders Javascript code to track page visits.  You must supply
      your Mixpanel token in the ``MIXPANEL_API_TOKEN`` setting.