Loop-help for a newbie?

[buran]

openpyxl except both ways to define the range to merge
, i.e. string or explicit start/erd row/col as integers

from the docs

>>> from openpyxl.workbook import Workbook
>>>
>>> wb = Workbook()
>>> ws = wb.active
>>>
>>> ws.merge_cells('A2:D2')
>>> ws.unmerge_cells('A2:D2')
>>>
>>> # or equivalently
>>> ws.merge_cells(start_row=2, start_column=1, end_row=4, end_column=4)
>>> ws.unmerge_cells(start_row=2, start_column=1, end_row=4, end_column=4)

so if you face problem, it's somewhere else, not the way merge cells are defined