def group(self, start, end=None, outline_level=1, hidden=False):
        """allow grouping a range of consecutive columns together

        :param start: first column to be grouped (mandatory)
        :param end: last column to be grouped (optional, default to start)
        :param outline_level: outline level
        :param hidden: should the group be hidden on workbook open or not
        """
        if end is None:
            end = start

        new_dim = self[start]
        new_dim.outline_level = outline_level
        new_dim.hidden = hidden

        work_sequence = get_column_interval(start, end)[1:]
        for column_letter in work_sequence:
            if self in column_letter:
                del self[column_letter]
        new_dim.min, new_dim.max = map(column_index_from_string, (start, end))
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/openpyxl-2.3.0-b2/openpyxl/worksheet/dimensions.py/DimensionHolder.group/swapped operands of `in`