python去掉excel空格和换行，报错'int' object has no attribute 'strip'

在网上找了一段代码，进行运行后运行错误，哪位朋友帮忙看看

    #去除exce空格和空行
    def clear_blank_space(self):
        #加载文件
        wb=load_workbook(self.file_name)
        ws=wb.active
        for i in range(1,ws.max_row+1):
            for j in range(1,ws.max_column+1):
                old=ws.cell(i,j).value
                if old is not None:
                    ws.cell(i, j).value = old.strip().replace(' ', '').replace("\n", "")
        wb.save(self.file_name)
        wb.close()
        print('处理完成')

运行结果报错：

D:\Testing_Software\Python38\python.exe D:/Code/PycharmProjects/test_rigang/utile/operation_excel.py
Traceback (most recent call last):
File “D:/Code/PycharmProjects/test_rigang/utile/operation_excel.py”, line 87, in
opers.clear_blank_space()
File “D:/Code/PycharmProjects/test_rigang/utile/operation_excel.py”, line 80, in clear_blank_space
ws.cell(i, j).value = old.strip().replace(‘ ‘, ‘’).replace(“\n”, “”)
AttributeError: ‘int’ object has no attribute ‘strip’

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