The grid system of wxWidgets also works like that. It has drag-and-drop design tools, and copy-paste, and it can be written programmatically. So the best of b

The grid system of wxWidgets also works like that. It has drag-and-drop design tools, and copy-paste, and it can be written programmatically. So the best of both worlds exists, and it is just not used enough. wxWidgets has Python bindings.