python遍历文件夹下的文件

import os
import os.path


rootdir = 'D:\data'
list = os.listdir(rootdir) #列出文件夹下所有的目录与文件
for i in range(0,len(list)):
       path = os.path.join(rootdir,list[i])
       if os.path.isfile(path):
              #你想对文件的操作

import os
def walk_dir(dir,fileinfo,topdown=True):
    for root, dirs, files in os.walk(dir, topdown):
        for name in files:
            print(os.path.join(name))
            fileinfo.write(os.path.join(root,name) + '\n')
        for name in dirs:
            print(os.path.join(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)