A little over a year ago I wrote Types at the edges in Python to share a pattern I’ve been moving towards with my python development. Recently I read Parse, don’t validate and I think Alexis’ blog post does a wonderful job of explaining the concept of “type driven design”.

On reflection my post is effectively a technique to start applying this approach to python and do less “Shotgun parsing”.

Alexis’ post is haskell focussed, but I think it’s a great read for programmers of any language.