code: def captureas(parser, arg):
      
      args = arg.contents.split()
      if not 2 <= len(args) <= 3:
          raise template.TemplateSyntaxError('"captureas" node requires a variable name and/or assign only')
      nodelist = parser.parse(('endcaptureas',))
      parser.delete_first_token()
      return CaptureasNode(nodelist, args)
docs: example: {% captureas myvar 1 %}content...{% endcaptureas %} - {{ myvar }}
      result: content... - content...
  
      example: {% captureas myvar %}content...{% endcaptureas %} - {{ myvar }}
      result: - content...