#kivy is one of the worst packages of any type I have ever used in my entire life, and I started programming in the early 70s./

It is so terrible I really don't even know where to start. For example, simply constructing a Color has a global side effect(!) The Kivy "language" has a single global namespace over the whole application, has no spec, and is just crazy.

The worst is that there's no good way to make reusable components with behavior.