Override Qt method

def data(self, index, role=Qt.DisplayRole):
        """Override Qt method"""
        if not index.isValid() or not 0 <= index.row() < len(self._rows):
            return to_qvariant()
        row = index.row()
        column = index.column()

        name, state = self.row(row)

        if role == Qt.DisplayRole or role == Qt.EditRole:
            if column == 0:
                return to_qvariant(name)
        elif role == Qt.CheckStateRole:
            if column == 0:
                if state:
                    return Qt.Checked
                else:
                    return Qt.Unchecked
            if column == 1:
                return to_qvariant(state)
        return to_qvariant()