Openpyxl: How to add filters to all columns

You can simply read ws.dimensions and it will return a string value with your range from "A1:XX". I used this to apply filters to my entire excel spreadsheet.

import openpyxl as px

wb= px.load_workbook('Data/Test01.xlsx')
ws = wb.active

ws.auto_filter.ref = ws.dimensions

wb.save('Data/Test03.xlsx')

All you need to do is to set worksheet.auto_filter.ref to the full range of worksheet cells.

import openpyxl
from openpyxl.utils import get_column_letter

workbook = openpyxl.load_workbook('Data/Test01.xlsx')
worksheet = workbook['Sheet1']

FullRange = "A1:" + get_column_letter(worksheet.max_column) \
+ str(worksheet.max_row)
worksheet.auto_filter.ref = FullRange

workbook.save('Data/Test03.xlsx')