parameters: (self, node)
docstring: Subclasses should override to return a list of values to yield.
docstring_summary: Subclasses should override to return a list of values to yield.
docstring_tokens: Subclasses should override to return a list of values to yield .
function: def _get_key_value(self, node):
          """Subclasses should override to return a list of values to yield."""
          raise NotImplementedError
function_tokens: def _get_key_value ( self , node ) : raise NotImplementedError