model_row_iter

def model_row_iter(model, start_index=QModelIndex()):
    """ モデルのrowイテレータを返す

    :type start_index: QModelIndex
    :type model: QAbstractItemModel
    """
    if start_index.isValid():
        yield start_index

    while True:
        row = start_index.row()
        if row >= model.rowCount(start_index.parent()) - 1:
            break

        start_index = model.index(row + 1, 0, start_index.parent())
        yield start_index

        if model.rowCount(start_index) > 0:
            for _ in model_row_iter(model, model.index(0, 0, start_index)):
                yield _