--- /dev/null
+class NodeVisitor:\r
+ def get_visitor(self, node): ...\r
+ def visit(self, node, *args, **kwargs): ...\r
+ def generic_visit(self, node, *args, **kwargs): ...\r
+\r
+class NodeTransformer(NodeVisitor):\r
+ def generic_visit(self, node, *args, **kwargs): ...\r
+ def visit_list(self, node, *args, **kwargs): ...\r