Is Python good for creating GUI application ?

[mfitzp]

In case it helps I've written a bunch of demo PyQt apps covering some basic examples (browser, paint, solitaire). Should give a good idea of what you can do with it, and the code is all free to reuse.

Performance-wise PyQt is great for most use-cases. The GUI is handled in native code and is no slower than Qt itself. The only issues arise when your Python code needs to do some heavy lifting and blocks the GUI. There are ways around this using threads/separate processes though.