What's this?

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 essentially governed by pylint's needs. It used to be called logilab-astng.

It provides a compatible representation which comes from the _ast module. It rebuilds the tree generated by the builtin _ast module by recursively walking down the AST and building an extended ast. The new node classes have additional methods and attributes for different usages. They include some support for static inference and local name scopes. Furthermore, astroid builds partial trees by inspecting living objects.

Main modules are:

  • bases, node_classses and scoped_nodes contain the classes for the different type of nodes of the tree.
  • the manager contains a high level object to get astroid trees from source files and living objects. It maintains a cache of previously constructed tree for quick access.


Extract the tarball, jump into the created directory and run:

python install

For installation options, see:

python install --help

If you have any questions, please mail the mailing list for support. See for subscription information and archives. You may find older archives at .


Tests are in the 'test' subdirectory. To launch the whole tests suite at once, you may use the 'pytest' utility from logilab-common (simply type 'pytest' from within this directory) or if you're running python >= 2.7, using discover, for instance:

python -m unittest discover -p "unittest*.py"