Python刪除指定目錄下的過期文件

import os
import sys
import time
class DeleteLog:


def __init__(self,fileName,days):
    self.fileName = fileName
    self.days = days
def delete(self):
    if os.path.isfile(self.fileName):
        fd = open(self.fileName,'r')
        while 1:
            buffer = fd.readline()
            if not buffer : break
            if os.path.isfile(buffer):
                os.remove(buffer)
        fd.close()
    elif os.path.isdir(self.fileName):
        for i in [os.sep.join([self.fileName,v]) for v in os.listdir(self.fileName)]:
            print i
            if os.path.isfile(i):
                if self.compare_file_time(i):
                    os.remove(i)
            elif os.path.isdir(i):
                self.fileName = i
                self.delete()
def compare_file_time(self,file):
    time_of_last_access = os.path.getatime(file)
    age_in_days = (time.time()-time_of_last_access)/(60*60*24)
    if age_in_days > self.days:
        return True
    return False

if name == 'main':
    if len(sys.argv) == 2:
        obj = DeleteLog(sys.argv[1],0)
        obj.delete()
    elif len(sys.argv) == 3:
        obj = DeleteLog(sys.argv[1],int(sys.argv[2]))
        obj.delete()
    else:
        print "usage: python %s listFileName|dirName [days]" % sys.argv[0]
        sys.exit(1)</pre>