计算文件夹得大小和遍历文件夹

#-*- coding:cp936 -*-
import os, re
"""
查看文件夹下的所有文件及文件夹  join为拼接函数
"""
def Look_File(path):
   for root , dirs, files in os.walk(path, True):
        print root          #主目录
        for item in files:  #主目录下的文件夹
        print os.path.join(root, item)
  
"""
计算文件夹 大小
"""   
def FileSize(path):
    size = 0L
         for root , dirs, files in os.walk(path, True):
              size += sum([os.path.getsize(os.path.join(root, name)) for name in files])   #目录下文件大小累加
         return size
 
  
if __name__ == '__main__':
 Look_File("f://a")
 print FileSize("f://a")