class TestUI(QtGui.QDialog):
    super(TestUI, self).__init__(parent)
    # ... dialog setup ...
    self.okBtn = QtGui.QPushButton('ok')
    self.cancelBtn = QtGui.QPushButton('cancel')

    self.okButton.clicked.connect(self.okButtonCallback)
    self.cancelBtn.clicked.connect(self.cancelBtnCallback)

    def okButonCallback(self):
        self.close()
        return True # Can I return a variable from here???

    def canccelButtonCallback(self):
        self.close()
        return False

foo = TestUI()
foo.show()
print foo # ???? is there a way to get the return value????