def headerData(self, section, orientation, role=Qt.DisplayRole):
        """
        Return the header depending on section, orientation and Qt::ItemDataRole

        Args:
            section (int): For horizontal headers, the section number corresponds to the column number.
                Similarly, for vertical headers, the section number corresponds to the row number.
            orientation (Qt::Orientations):
            role (Qt::ItemDataRole):

        Returns:
            None if not Qt.DisplayRole
            _dataFrame.columns.tolist()[section] if orientation == Qt.Horizontal
            section if orientation == Qt.Vertical
            None if horizontal orientation and section raises IndexError
        """
        if role != Qt.DisplayRole:
            return None

        if orientation == Qt.Horizontal:
            try:
                label = self._dataFrame.columns.tolist()[section]
                if label == section:
                    label = section
                return label
            except (IndexError, ):
                return None
        elif orientation == Qt.Vertical:
            return section
Return the header depending on section, orientation and Qt::ItemDataRole

        Args:
            section (int): For horizontal headers, the section number corresponds to the column number.
                Similarly, for vertical headers, the section number corresponds to the row number.
            orientation (Qt::Orientations):
            role (Qt::ItemDataRole):

        Returns:
            None if not Qt.DisplayRole
            _dataFrame.columns.tolist()[section] if orientation == Qt.Horizontal
            section if orientation == Qt.Vertical
            None if horizontal orientation and section raises IndexError