openpyxl：合并单元格的左右边框

Question

documentation表示只需要更改合并单元格的左上角单元格

ws.merge_cells(start_row=1, start_column=1, end_row=1, end_column=3)
ws.cell(1,1).border=Border(right=Side(border_style='thick', color='000000'), left=Side(border_style='thick', color='000000'))
wb.save(filePath)

这不会更改合并单元格边框的右侧

有什么想法/帮助吗