分享几个小小的python爬虫供大家娱乐（人民日报要闻---to be continued ）

-1-实现人民日报要闻的抓取

说明文档：

使用包 : lxml，requests，urllib2
起始url :人民日报主页
爬取目标 :人民日报要闻

1. 要闻链接
2. 要闻标题
3. 要闻时间
4. 要闻来源
5. 要闻内容

输出格式: HTML表格文件
思路 : 首先收集要爬取页面的所有链接，之后逐个进行爬取

实现代码：

#-*-coding:utf8-*-
#这段代码写得不是很好，许多地方都有要改善的地方，大神勿喷^-^
import requests
import urllib2
from lxml import etree
from multiprocessing.dummy import Pool as ThreadPool
import HTMLParser

def htmls(url):
    url = url.replace(" ", "")
    request = urllib2.Request(url)
    head = 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36'
    try:
        response2 = urllib2.urlopen(request)
        html = response2.read()
        #html = unicode(html, "gb2312").encode("utf-8").decode('utf-8')
        selector = etree.HTML(html)
        return selector
    except urllib2.HTTPError, e:
        return

def firsthtml(url):
    header = {
          'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36'}
    html = requests.get(url, headers=header)
    selector = etree.HTML(html.text)
    return selector
def urls(url):
    selector = firsthtml(url)
    content_field1 = selector.xpath('/html/body/section[5]/div[2]/ul/li/strong/a')
    content_field2 = selector.xpath('/html/body/section[5]/div[2]/ul/li/a')
    content = content_field1 + content_field2
    urlss = []
    for content in content:
        urlss.append(content.attrib['href'])
    return urlss


def spider(url): #url处理函数
    print '正在处理衔接'+str(num)+": ", url
    selector = htmls(url)
    if selector is None:
        print '该链接未找到 -_-'
        return
    temp = {}
    try:
        title_path = selector.xpath('/html/body/div[4]/h1')
        content_path = selector.xpath('//*[@id="rwb_zw"]/p')
        time_path = selector.xpath('/html/body/div[4]/div/div[1]')
        source_path = selector.xpath('/html/body/div[4]/div/div[1]/a')
        temp['time'] = time_path[0].text[0:19]
        temp['source'] = source_path[0].text
        temp['title'] = title_path[0].text
    except:
        title_path = selector.xpath('/html/body/div[@class="pic_content clearfix"]/div[@class="title"]/h1')
        content_path = selector.xpath('/html/body/div[@class="content clear clearfix"]/p')
        source_path = selector.xpath('//*[@id="picG"]/div[2]/div[2]/a')
        time_path = selector.xpath('//*[@id="picG"]/div[2]/div[2]/text()[2]')
        try:
            temp['time'] = time_path[0][0:23]
            temp['source'] = source_path[0].text
            temp['title'] = title_path[0].text
        except:
            print '该链接爬取失败 -_-'
            return
    scontent = ''
    for content in content_path:
        scontent = scontent + content.text
    temp['content'] = scontent
    temp['url'] = url
    all.append(temp)
    print "成功爬取该链接 ^.^"

def tohtml(datas):
    fout = open('content.html', 'w')
    fout.write("")
    fout.write("")
    fout.write("")
    fout.write("")
    fout.write("")
    fout.write("")
    for data in datas:
        fout.write("")
        fout.write("" % data['url'])
        fout.write("" % data['title'].encode('utf-8'))
        fout.write("" % data['time'].encode('utf-8'))
        fout.write("" % data['source'].encode('utf-8'))
        fout.write("" % data['content'].encode('utf-8'))
        fout.write("")

    fout.write("
%s
%s
%s
%s
%s
")
    fout.write("")
    fout.write("")
fout.close()
if __name__ == '__main__':
num = 1
all = []
urlss = urls('http://www.people.com.cn/')
# pool = ThreadPool(4)
for x in urlss:
spider(x)
num = num + 1
# results = pool.map(spider, urlss)
tohtml(all)
# pool.close()
# pool.join()
#本来想开个多线程的，懒得写了，大家有兴趣可以自己尝试下，也不难 ^-^

运行结果：

爬取数量取决于中国人民网首页要闻一栏的文章数量

运行成功产生content.html文件

可以在浏览器中直接打开

我是一条小小的分割线，我还是第一条 ^-^

---

to be continued 。。。时间不够了-_-!