EXCEL批量处理中的一些问题

批量处理一些EXCEL数据，但是导出的时候后面的一些字没了，是怎么回事？

"from openpyxl import Workbook\n",
"from openpyxl import load_workbook\n",
"from openpyxl.writer.excel import ExcelWriter\n",
"import os\n",
"\n",
"\n",
"rootPath = \"C:/Users/95806/Desktop/data/\" #文件夹位置\n",
"resultPath = \"C:/Users/95806/Desktop/result/\" #存放位置\n",
"\n",
"excelNames = os.listdir(rootPath)  #获得所有的文件名\n",
"\n",
"for i in range(len(excelNames)):\n",
"    # print(excelName)\n",
"    excelName = excelNames[i]\n",
"    path = rootPath + excelName  #当前excel位置\n",
"    wb = load_workbook(path)\n",
"    sheetnames = wb.sheetnames #获得表单名字 \n",
"    sheet = wb[sheetnames[0]]\n",
"    \n",
"    #修改操作\n",
"    cell = sheet['C9'].value\n",
"    sheet['C9'].value =  str(sheet['C9'].value) +'%%'\n",
"    cell = sheet['F9'].value\n",
"    sheet['F9'].value =  str(sheet['F9'].value) +'%%'\n",
"    \n",
"    #输出\n",
"    saveFile = resultPath + \"output\" + excelName\n",
"    wb.save(saveFile)

运行结果会导致我少了后面的勾什么的，为什么呢

我只想把那里面的C9改成和后面一样的双百分比格式，其余不动

是不是大小超限了，试试Pandas库