python移除系统多余大文件

import os, sys
#引入统计模块
from stat import *
BIG_FILE_THRESHOLD = 10000000L
dict1 = {} # filesize 做 key, filename 做 value
dict2 = {} # filename 做 key, filesize 做 value
def treewalk(path):
 try:
 for i in os.listdir(path):
 mode = os.stat(path+"/"+i).st_mode
 if S_ISDIR(mode) <> True:
 filename = path+"/"+i
 filesize = os.stat(filename).st_size
 if filesize > BIG_FILE_THRESHOLD:
 if filesize in dict1: 
 dict2[filename] = filesize
 dict2[dict1[filesize]]=filesize
 else:
 dict1[filesize] = filename 
 else:
 treewalk(path+"/"+i)
 except WindowsError:
 pass
def printdict(finaldict):
 for i_size in finaldict.values():
 print i_size
 for j_name in finaldict.keys():
 if finaldict[j_name] == i_size:
 print j_name
 print "
"
if __name__=="__main__":
 treewalk(sys.argv[1])
 printdict(dict2)