import osdef walk_dir(dir,fileinfo,topdown=True):    for root, dirs, files in os.walk(dir, topdown):        for name in files:            print(os.path.join(root,name))            fileinfo.write(os.path.join(root,name) + '\n')        for name in dirs:            print(os.path.join(root,name))            fileinfo.write('  ' + os.path.join(root,name) + '\n')            dir = raw_input('please input the path:')fileinfo = open('list.txt','w')walk_dir(dir,fileinfo)fileinfo.close()