python删除指定时间间隔之前的文件

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""Document: Remove Synctoycmd sync expired .tmp files"""
import os
import time
import datetime
def diff():
 '''time diff'''
 starttime = datetime.datetime.now()
 time.sleep(10)
 endtime = datetime.datetime.now()
 print "time diff: %d" % ((endtime-starttime).seconds)
def fileremove(filename, timedifference):
 '''remove file'''
 date = datetime.datetime.fromtimestamp(os.path.getmtime(filename))
 print date
 now = datetime.datetime.now()
 print now
 print 'seconds difference: %d' % ((now - date).seconds)
 if (now - date).seconds > timedifference:
 if os.path.exists(filename):
 os.remove(filename)
 print 'remove file: %s' % filename
 else:
 print 'no such file: %s' % filename
FILE_DIR = 'D:/'
if __name__ == '__main__':
 print 'Script is running...'
 #diff()
 while True:
 ITEMS = os.listdir(FILE_DIR)
 NEWLIST = []
 for names in ITEMS:
 if names.endswith(".txt"):
 NEWLIST.append(FILE_DIR + names)
 #print NEWLIST
 for names in NEWLIST:
 print 'current file: %s' % (names)
 fileremove(names, 10)
 time.sleep(10)
 print "never arrive..."