Apply borders to all cells in a range with openpyxl

I have a script that takes a pandas dataframe and chops it up into several hundred chunks and saves each chunk as a separate excel file. Each chunk will have the same number of columns but the number of rows varies. I've figured out how to apply all the other necessary formatting to these files with openpyxl, but I haven't yet determined the fastest way to apply borders. Also, I think I'm just not applying borders correctly, because the code below (which I suspect shouldn't need to loop over each cell individually) doesn't apply any borders. from import Border wb = load_workbook(filename = _fname) ws = wb.worksheets[0] for _row in ws.range('A1:L'+str(ws.get_highest_row() ) ): for _cell in _row: = Border.BORDER_THIN = Border.BORDER_THIN = Border.BORDER_THIN = Border.BORDER_THIN So this code *works*, but it doesn't apply the border I expect (the default border in excel) and it takes a lot more steps than I'd prefer. My expectation is that I should be able to do something like this: from import Border wb = load_workbook(filename = _fname) ws = wb.worksheets[0] _range = ws.some_range_func('A1:L'+str(ws.get_highest_row() ) ): = Borders.BORDER_THIN Does this functionality exist? If not, can someone please be so kind as to at least explain how to apply the default border style and not this slightly thicker border? None of Border.BORDER_THICK, Border.BORDER_MEDIUM, Border.BORDER_THIN, or Border.BORDER_HAIR seem correct. Thanks!

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