[FIXED] Find out if app was already initialized?

Issue

I wanted to spawn a QWebKit instance in PySide and quickly got a segmentation fault - I forgot to set up an instance of QApplication. Since SIGSEGV is not a good failure mode, is there a way to catch that and throw an exception instead?

Solution

The QCoreApplication class (which QApplication inherits), has the static method instance() which allows you to check this:

if QApplication.instance() is not None:
    # do stuff..
else:
    raise RuntimeError('no application object')

Answered By - ekhumoro