I am a newcomer to Qt too, and I had exactly the same issue with
Windows+Python+Qt+Spider while trying to run the same zetcode tutorial
example. I have no idea why it does not work as intended but replacing the
handler in question QCoreApplication.instance().quit with self.close
appears to work. I came up with this workaround after observing that the
standard way to close the app window by clicking "x" button in the window
title bar works as expected, and I assume that self.close() does something
like that.
Still would be helpful to understand why quit() does not work as one would
expect and what is the right way to quit this application in Spyder
environment.
qbtn.clicked.connect(QCoreApplication.instance().quit)
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