我解决了这个问题，并修复了以下代码

i solved this problem and fixed the code has following

import os
import win32com.client
import re
path = (r'D:\programing\test')
word_file_names = []
word = win32com.client.Dispatch('Word.Application')
for dirpath, dirnames, filenames in os.walk(path):
    for f in filenames:  
        if f.lower().endswith(".docx") :
            new_name = f.replace(".docx", ".pdf")
            in_file =(dirpath + '/'+ f)
            new_file =(dirpath + '/' + new_name)
            doc = word.Documents.Open(in_file)
            doc.SaveAs(new_file, FileFormat = 17)
            doc.Close()
        if f.lower().endswith(".doc"):
            new_name = f.replace(".doc", ".pdf")
            in_file =(dirpath +'/' + f)
            new_file =(dirpath +'/' + new_name)
            doc = word.Documents.Open(in_file)
            doc.SaveAs(new_file, FileFormat = 17)
            doc.Close()
word.Quit()