def Merge_cells(result_file, sheet_name, col_num):
    wb = openpyxl.load_workbook(result_file)
    ws = wb[sheet_name]
    # 验证参数
    if col_num < 1:
        raise ValueError("col_num must be a positive integer.")
    # 获取指定列数据
    col_list = [cell[0].value for cell in ws.iter_rows(min_row=2, min_col=col_num, max_col=col_num)]
    if not col_list:
        return  # 列数据为空，无需合并
    # 合并单元格的逻辑
    merge_ranges = []
    start_index = 0
    current_value = col_list[0]
    for i in range(1, len(col_list)):
        if col_list[i] != current_value:
            end_index = i - 1
            if end_index >= start_index:
                merge_ranges.append((start_index, end_index))
            current_value = col_list[i]
            start_index = i
    # 合并单元格和设置对齐
    col_letter = get_column_letter(col_num)
    for start, end in merge_ranges:
        merge_range = f"{col_letter}{start + 2}:{col_letter}{end + 2}"
        ws.merge_cells(merge_range)
        for row in ws[merge_range]:
            for cell in row:
                cell.alignment = Alignment(horizontal="center", vertical="center")
    wb.save(result_file)

Merge_cells(table_name, "Sheet1", 4)  #调用Merge_cells 对sheet1中D列 合并单元格