Apply borders to all cells in a range with openpyxl

Question

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

Answer 1

May be this is handy:

from openpyxl.reader.excel import load_workbook
from openpyxl.style import Border

def set_border(ws, cell_range):
    rows = ws.range(cell_range)
    for row in rows:
        row[0].style.borders.left.border_style = Border.BORDER_THIN
        row[-1].style.borders.right.border_style = Border.BORDER_THIN
    for c in rows[0]:
        c.style.borders.top.border_style = Border.BORDER_THIN
    for c in rows[-1]:
        c.style.borders.bottom.border_style = Border.BORDER_THIN

#usage example:
ws = load_workbook('example.xlsx').get_active_sheet()
set_broder(ws, "C3:H10")

It performs reasonably fast.