QModelIndex TreeModel::index(int row, int column, const QModelIndex &parent) const
{
    if (!hasIndex(row, column, parent))
        return QModelIndex();

    TreeItem *parentItem;

    if (!parent.isValid())
        parentItem = rootItem;
    else
        parentItem = static_cast<TreeItem*>(parent.internalPointer());

    TreeItem *childItem = parentItem->child(row);
    if (childItem)
        return createIndex(row, column, childItem);
    return QModelIndex();
}

def index(self, int row, int column, QModelIndex parent):

    if (not hasIndex(row, column, parent))
        def QModelIndex():
    parentItem = TreeItem()
    if (not parent.isValid())
        parentItem = rootItem
else:
        parentItem = TreeItem(parent.internalPointer())
    childItem = parentItem.child(row)
    if (childItem)
        def createIndex(row,column,childItem):
    def QModelIndex():