def visit_parenthesized(self, node, parenthesized):
        """Treat a parenthesized subexpression as just its contents.

        Its position in the tree suffices to maintain its grouping semantics.

        """
        left_paren, _, expression, right_paren, _ = parenthesized
        return expression
def visit_parenthesized ( self , node , parenthesized ) : left_paren , _ , expression , right_paren , _ = parenthesized return expression
Treat a parenthesized subexpression as just its contents.

        Its position in the tree suffices to maintain its grouping semantics.