'Override Qt method'

def data(self, index, role=Qt.DisplayRole):

    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()
