遍歷指定資料夾下的檔案，根據檔案字尾名，獲取指定型別的檔案列表；根據檔案列表裡的檔案路徑，逐個獲取檔案屬性裡的“修改時間”，如果“修改時間”與“系統當前時間”差值大於某個值，則刪除該檔案。

#!/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..."