python自动备份阿里云数据库binlog

#coding:utf8
from aliyunsdkcore import client
from aliyunsdkrds.request.v20140815 import DescribeBackupsRequest
from aliyunsdkrds.request.v20140815 import DescribeBinlogFilesRequest
import json
import urllib
import datetime
import os

def binlogmobile(db_instanceid):
        today_time = datetime.datetime.now()
        date1 = datetime.datetime.strftime(today_time, '%Y-%m-%d')  # +‘T00:00:00Z‘
        yes_time = today_time + datetime.timedelta(days=-1)
        date2 = datetime.datetime.strftime(yes_time,'%Y-%m-%d')  #  +‘T00:00:00Z‘
        start_date = date2
        end_date = date1
        startdate = start_date+'T00:00:00Z'
        enddate = end_date+'T00:00:00Z'
        cur_dir = '/logs/mysql/mobile/'
        folder_name = date1
        os.mkdir(os.path.join(cur_dir, folder_name))
        clt = client.AcsClient('accesskeyid','密码','cn-beijing')
        request = DescribeBinlogFilesRequest.DescribeBinlogFilesRequest()
        request.set_accept_format('json')
        request.set_action_name('DescribeBinlogFiles')
        request.set_DBInstanceId(db_instanceid)
        request.set_StartTime(startdate)
        request.set_EndTime(enddate)
        result = clt.do_action(request)
        s=json.loads(result)
        list = s['Items']['BinLogFile']
        for i in list:
            url = i['DownloadLink']
            idx = url.split('/')[5].split('?')[0]
            filename = "/logs/mysql/mobile/%s/%s" % (date1,idx)
            urllib.urlretrieve(url,filename)

binlogmobile('rdsid')