Shameless plug! I have a similar Python project but focused on building native applications without actually writing a single line of UI code. I call it Gooey[1]! It was front page on HN a few years ago ^_^

The next version is currently in RC1 and brings support for in-UI validation/error messages, better layout customization[2], new widget types, and more!

I'm trying to recruit a few more people to test the current release branch[3] :)

[1] https://github.com/chriskiehl/Gooey. [2] https://user-images.githubusercontent.com/1408720/34464824-c... [3] https://github.com/chriskiehl/Gooey/tree/rc1