I am working on a WinAmp clone called PySongMan(ager) and kept getting a stackoverflow bug. Drilling my code downward, simplifying it as I went, I got a script like:

Which kept throwing a 0x0…409 error which is a stack overflow error. Finally, somewhat by accident, I figured out my mistake. The good code looks like:

and runs without issue. So the problem is that before any QT widget/window can be created, QApplication must be called first.