import openpyxl as px
from openpyxl.styles import PatternFill
filepath = r'c:\sample/excel_test/test.xlsx'
savepath = r'c:\sample/excel_test/test2.xlsx'
wb = px.load_workbook(filepath)
ws = wb.get_sheet_by_name('Sheet1')
ws.cell(row = 3, column = 3).fill = PatternFill(patternType='solid', fgColor='ffc040')
wb.save(savepath)
AD