Everyone keeps saying that, but my experience is rather the opposite. Static typing is great when the program is small and you can keep the model in your head, but the larger the program, the more you benefit from dynamic typing. Sure, static typing helps with tiny refactorings, but making non trivial changes that don't play well with the existing model proved to be too much effort.

I can't speak for Python but since the codebases were Perl and Common Lisp based, I believe it would be similar, should there be anything similar to the MOP for Python.