extend python's abstract syntax tree
The aim of this module is to provide a common base representation of python source code for projects such as pychecker, pyreverse, pylint… Well, actually the development of this library is essentialy governed by pylint’s needs.
It extends class defined in the compiler.ast  module with some additional methods and attributes. Instance attributes are added by a builder object, which can either generate extended ast (let’s call them astng ;) by visiting an existant ast tree or by inspecting living object. Methods are added by monkey patching ast classes.