Python爬虫开发【第1篇】【beautifulSoup4解析器】

CSS 选择器：BeautifulSoup4

Beautiful Soup 也是一个HTML/XML的解析器，主要的功能也是如何解析和提取 HTML/XML 数据。

pip 安装：pip install beautifulsoup4

官方文档：http://beautifulsoup.readthedocs.io/zh_CN/v4.4.0

抓取工具	速度	使用难度	安装难度
正则	最快	困难	无（内置）
BeautifulSoup	慢	最简单	简单
lxml	快	简单	一般

 

使用BeautifuSoup4爬腾讯社招页面

地址：http://hr.tencent.com/position.php?&start=10#a

# bs4_tencent.py


from bs4 import BeautifulSoup
import urllib2
import urllib
import json    # 使用了json格式存储

def tencent():
    url = 'http://hr.tencent.com/'
    request = urllib2.Request(url + 'position.php?&start=10#a')
    response =urllib2.urlopen(request)
    resHtml = response.read()

    output =open('tencent.json','w')

    html = BeautifulSoup(resHtml,'lxml')

# 创建CSS选择器
    result = html.select('tr[class="even"]')
    result2 = html.select('tr[class="odd"]')
    result += result2

    items = []
    for site in result:
        item = {}

        name = site.select('td a')[0].get_text()
        detailLink = site.select('td a')[0].attrs['href']
        catalog = site.select('td')[1].get_text()
        recruitNumber = site.select('td')[2].get_text()
        workLocation = site.select('td')[3].get_text()
        publishTime = site.select('td')[4].get_text()

        item['name'] = name
        item['detailLink'] = url + detailLink
        item['catalog'] = catalog
        item['recruitNumber'] = recruitNumber
        item['publishTime'] = publishTime

        items.append(item)

    # 禁用ascii编码，按utf-8编码
    line = json.dumps(items,ensure_ascii=False)

    output.write(line.encode('utf-8'))
    output.close()

if __name__ == "__main__":
   tencent()