A GUI framework for running simulations

[ram.rachum at gmail.com]

Hello! I am currently working on writing a simulation engine for
special relativity physics. I'm writing it in Python, of course. I'm
doing fine with the engine, but I want a GUI framework in which I
could use it conveniently, and test different setups on it. I'm not so
strong with GUI programming. I looked at Tkinter, I looked at
WxPython, I looked at PythonCard. It all looks pretty daunting.

My question is, does there exist a GUI package that is intended
specifically for simulations? I saw a program called Golly, which is a
simulation for Conway's Game of Life. Its GUI had most of the features
I needed. For example, you can load a setup, there are "play" and
"stop" buttons, you can change a setup and save it, etc.

So does anyone know of a general GUI framework for running
simulations?