17. 统计一下test2下的所有子目录有几个，一共有多少个文件

#encoding=utf-8

import os

dir_num=0

file_num=0

for root, dirs, files in os.walk("e:\\test2",topdown=False) :

    #print u"当前目录:",root #打印目录绝对路径

    for name in files :

        file_num+=1

    for dir in dirs:

        dir_num+=1

print "file number:",file_num

print "dir number:",dir_num