New submission from anatoly techtonik: http://docs.python.org/2/library/ast.html AST module doc is incomplete. To write node visitor, you need to know possible types of parameters and expected values for every node type. They are different. http://hg.python.org/cpython/file/1ee45eb6aab9/Parser/Python.asdl For example, visit_Assign expects: Assign(targets, value) `targets` can be List, Tuple or Name When there is List, and when there is Tuple? It should be documented. ---------- assignee: docs@python components: Devguide, Documentation messages: 202675 nosy: docs@python, ezio.melotti, techtonik priority: normal severity: normal status: open title: ast - docs for every node type are missing _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue19557> _______________________________________