QT uses "toggled". I do not use QT much but it would be something like self.radioButton_one.setCheckable(True) QtCore.QObject.connect(self.radioButton_one, QtCore.SIGNAL("toggled ()"),self.button_one_function)
If this doesn't work, you can probably find more with a Google for "toggled". -- http://mail.python.org/mailman/listinfo/python-list