Return modified Dataframe -- this is *not* a copy

def get_value(self):
        """Return modified Dataframe -- this is *not* a copy"""
        # It is import to avoid accessing Qt C++ object as it has probably
        # already been destroyed, due to the Qt.WA_DeleteOnClose attribute
        df = self.dataModel.get_data()
        if self.is_series:
            return df.iloc[:, 0]
        else:
            return df