Python has a lot of GUI libraries: tkinter, wxWidgets, pyGTK etc. But all these GUIs need to be installed and quite heavyweight, so it's a bit complex to deploy end-user GUI python apps that relay on mentioned GUI libraries.
Recently, I have thought about python's built-in ctypes module. Theoretically, it's possible to create a pure python GUI library that will use ctypes on windows ( windll.user32.CreateWindowEx, etc ), native pyObjC on MacOS and pyGTK / pyQt on gnome / kde. Does such a library exist? If not, what do you think is wrong with this idea?
The path of least effort and best results would be to learn what it takes to deploy an app using those existing GUI libraries.