效果

# -*- coding: utf-8 -*-   
      
import os  

file_path = '.\\'

files_list = []
for root, dirs, files in os.walk(file_path): 
#     print(root) #当前目录路径  
#     print(dirs) #当前路径下所有子目录  
#     print(files) #当前路径下所有非目录子文件
    files_list.append(files)

with open('file_name.txt', 'w') as file:
    for i in files_list[0]:
        file.write(i+'\n')