code: def traverse(self, traverser, **kwargs):
          
          result = self.rule.traverse(traverser, **kwargs)
          return self.conversion(result)
docs: Implementation of mandatory interface for traversing the whole rule tree.
          This method will call the ``traverse`` method of child rule tree and
          then perform arbitrary conversion of the result before returning it back.
          The optional ``kwargs`` are passed down to traverser callback as additional
          arguments and can be used to provide additional data or context.
  
          :param pynspect.rules.RuleTreeTraverser traverser: Traverser object providing appropriate interface.
          :param dict kwargs: Additional optional keyword arguments to be passed down to traverser callback.