xpath text用法

#coding=utf-8
from gevent import monkey,pool
monkey.patch_all()
import os
import gevent
from lxml import etree
import urllib2
import time
jobs=[]
links=[]
p=pool.Pool(30)
urls=[]
f=open('d:\\nlx_author.txt','w')

'''
def get_links(url):
    r=urllib2.urlopen(url).read()
    html=etree.HTML(r)
    results=html.xpath('//td[@id="title"]//a')
    k+=1
    for txt in results:
        f.write(txt.text.encode('utf-8')+'\n')
'''

def get_links(url):
    r=urllib2.urlopen(url).read()
    html=etree.HTML(r)
    result=html.xpath('//div[@class="viewbox"]//p//text()')   #重点理解
    for x in result:
        f.write(x.encode('utf8'))
    f.write('\n\n')
    #f.write(result[0].xpath('string(.)').encode('utf-8'))

root_url='http://www.nlx.gov.cn/inter/'

for i in range(2,3):  #测试20页，实际有965页
    ur='http://www.nlx.gov.cn/inter/?tid=&pages=%d'%i
    html=urllib2.urlopen(ur).read()
    txt=etree.HTML(html)
    results=txt.xpath('//td[@id="title"]//a/@href')
    for r in results:
        urls.append(root_url+r)
print time.strftime('%H:%M:%S')
for url in urls:
    jobs.append(p.spawn(get_links,url))
gevent.joinall(jobs)
print time.strftime('%H:%M:%S')
f.close()