There are a number of blogs out there that tackle the problems of callbacks for servers, or for Javascript, but novices trying to write Python GUIs shouldn't have to learn about the different issues involved in servers, or a whole different language.
Imagine a simple Tkinter app.
So you've installed Python from an official binary installer on python.org's Releases page, you've installed Xcode from the App Store and the Command Line Tools from Xcode, you've installed pip from its setup script.
