It's easier to evolve Python programs along that particular axis because of duck typing and dynamic dispatch, but otoh, it's harder to rename or remove methods

It's easier to evolve Python programs along that particular axis because of duck typing and dynamic dispatch, but otoh, it's harder to rename or remove methods or change method signatures without thorough unit tests. I really don't think one is better than the other in all cases, and neither really seems to get it 'right' in the sense that there's no room for improvement.