Python xlsx转xls xls文件修复

import os.path
import win32com.client as win32
rootdir = r''
# 三个参数：父目录；所有文件夹名（不含路径）；所有文件名
for parent, dirnames, filenames in os.walk(rootdir):
    for fn in filenames:
        filedir = os.path.join(parent, fn)
        excel = win32.gencache.EnsureDispatch('ket.Application')
        wb = excel.Workbooks.Open(filedir)
        wb.SaveAs(filedir.replace('xlsx', 'xls'), FileFormat=56)  # 我这里原文件是大写
        wb.Close()
        excel.Application.Quit()