openpyxl如果A列相同，如何突出显示所有其他不同的列？

import openpyxl

workbook = openpyxl.load_workbook('filename.xlsx')

worksheet = workbook['sheetname']

column_a_values = {}

for row in worksheet.iter_rows(min_row=2, min_col=1, max_col=1):
    cell = row[0]
    column_a_values[cell.value] = cell.row

for column in range(2, worksheet.max_column + 1):
    for row in range(2, worksheet.max_row + 1):
        cell = worksheet.cell(row=row, column=column)
        if cell.value != worksheet.cell(row=column_a_values[cell.row], column=1).value:
            cell.fill = openpyxl.styles.PatternFill(start_color="FFFF00", end_color="FFFF00", fill_type="solid")

workbook.save('filename.xlsx')