excel文件公式数据为None怎么办？

# 原因，包问题
我用openpyxl操作完以后，带公式的值就读取不出来了;

# 编写操作，打开一个目录下的所有xlsx文件功能

# 所需要的依赖

import win32api
import win32con
import win32process
from win32com import client
import psutil

def kill(p_name="excel.exe"):
    pids = psutil.pids()
    for pid in pids:
        try:
            p = psutil.Process(pid)
        except:
            continue
        if p.name().lower() == p_name:
            print(f"杀死{p_name}")
            cmd = f'taskkill /F /IM {p.name()}'
            os.system(cmd)

def open_all_excel():
    lang_col_mapper = get_lang_col_mapper()
    # xlApp = client.Dispatch("Excel.Application")
    for lang_key, _ in lang_col_mapper.items():
        # print(lang_key)
        # if "en" not in lang_key:
        #     continue
        file_dir = os.path.join(datasheetDir, lang_key)
        file_list = walkFile(file_dir)
        count_num = 0
        xlApp = client.Dispatch("Excel.Application")
        for file_name in file_list:
            count_num += 1
            if file_name.startswith("~"):
                continue
            if not (file_name.endswith(".xlsx")):
                continue
            excel_file = f"/{lang_key}/{file_name}"
            file_src = os.path.join(datasheetDir, lang_key,file_name)
            file_src = change_path_platform(file_src=file_src)
            # xlApp = client.Dispatch("Excel.Application")
            try:
                xlApp.Visible = False
            except:
                try:
                    xlApp.Visible = False
                except:
                    try:
                        xlApp.Visible = False
                    except:
                        xlApp.Visible = False
            books = xlApp.Workbooks.Open(file_src)
            xlApp.DisplayAlerts = False
            logger.info(f"第{_-4}语言 {lang_key} {count_num}    {file_src}已重新打开")

            try:
                books.SaveAs(file_src)

            except Exception as e:
                print(f"ERROR : {file_src}  {e}")

            books.Close()
            xlApp.DisplayAlerts = True
        xlApp.Quit()
        kill()
        time.sleep(5)