We are happy to announce the Astng 0.20.0 and Pylint 0.20.0 releases.

Pylint is a static code checker based on Astng, both depending on logilab-common 0.49.


Astng 0.20.0 is a major refactoring: instead of parsing and modifying the syntax tree generated from python's _ast or compiler.ast modules, the syntax tree is rebuilt. Thus the code becomes much clearer, and all monkey patching will eventually disappear from this module.

Speed improvement is achieved by caching the parsed modules earlier to avoid double parsing, and avoiding some repeated inferences, all along fixing a lot of important bugs.


Pylint 0.20.0 uses the new Astng, and fixes a lot of bugs too, adding some new functionality:

  • parameters with leading "_" shouldn't count as "local" variables
  • warn on assert( a, b )
  • warning if return or break inside a finally
  • specific message for NotImplemented exception

We would like to thank Chmouel Boudjnah, Johnson Fletcher, Daniel Harding, Jonathan Hartley, Colin Moris, Winfried Plapper, Edward K. Ream and Pierre Rouleau for their contributions, and all other people helping the project to progress.

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