python产生的数据比处理的速度快造成堵塞怎样处理？

# -*- coding: utf-8 -*-

import requests

import re

for i in range(5000,5484):

    url = 'http://www.meizitu.com/a/'+str(i)+'.html'



    headers = {

        'User-Agent': 'Mozilla/5.0 (Linux;u;Android 4.2.2;zh-cn;) AppleWebKit/534.46 (KHTML,like Gecko) Version/5.1 Mobile Safari/10600.6.3 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)'

    }



    r = requests.get(url, headers=headers)

    r.encoding = 'gb2312'

    par = re.compile('
', re.S)

    items = re.findall(par, r.text)

    for item in items:

        print item[0], item[1]

        down = requests.get(item[1], headers=headers)

        with open('img3/%s.jpg' % item[0], 'wb') as f:

            f.write(down.content)