python爬虫 根据关键字在新浪网站查询跟关键字有关的新闻条数(按照时间查询)

# -*- coding: utf-8 -*-"""Created on Thu May  8 09:14:13 2014@author: lifeix"""import urllib2import refrom datetime import datetimedef craw1(keyword_name, startYear):    a = keyword_name    print a,"\t"    today = datetime.today()    ye = today.year    mon = today.month    for year in range(startYear,ye + 1):        month = 13        if ye == year:            month = mon        for month in range(1,month):            begintime = str(year) + "-" + "%02d"%month+"-01"            endtime = str(year) + "-" + "%02d"%month+"-31"            print begintime, endtime            userMainUrl = "http://search.sina.com.cn/?time=custom&stime="+begintime+"&etime="+endtime+"&c=news&q="+a+"&sort=time&range=title"            print userMainUrl            req = urllib2.Request(userMainUrl)            resp = urllib2.urlopen(req)            respHtml = resp.read()            urlpat = re.compile(r'<div class="l_v2">(.*?)</div>')            match = urlpat.findall(respHtml)            for numstr in match:                searchnum = numstr[11:-2]            print "searchnum=",searchnum            craw1('大学',2014)