[PyQt] Qt app won't crash after sys.excepthook override

[Alfalfa]

I expect that Qt has an exception handler that catches the exception raised in the keypressEvent(). No such exception handler is ready to catch the exception raised in the __init_() method.

This is exactly the behavior I expect.

When sys.excepthook is not overridden, an exception in keyPressEvent() exits the app. Why this behavior is not restored once sys.__excepthook__() is called?