python - PySide Signal with Argument -

qgroupbox has signal clicked has optional checked parameter. suppose i'm trying connect slot inside of class so: box.clicked.connect(self.func), declaration of slot must def func(self, checked), func being called 1 argument. how desired behaviour of func being called both self , optional checked arguments?

the behaviour of signals optional default parameters differs between pyqt , pyside. in pyqt, default parameter always sent, in pyside have explicitly request it:

    box.clicked[bool].connect(self.func) 

this better design choice, say, pyqt behaviour can lead bugs if forget default value sent though didn't ask it. case of explicit being better implicit...