网络爬虫基础练习

import requests
url = 'http://news.gzcc.cn/html/xiaoyuanxinwen/'
res = requests.get(url)
res.encoding = 'utf-8'
res.text
from bs4 import BeautifulSoup
soup = BeautifulSoup(res.text,'html.parser')

取出h1标签的文本

s=soup.select('h1')
s2=s[0].text
print(s2)

取出a标签的链接

 s=soup.a.attrs['href']

 soup.li.a.attrs['href']

 print(s)

取出所有li标签的所有内容

s=soup.select('li')[0].text
print(s)

取出一条新闻的标题、链接、发布时间、来源

s0=soup.select('.news-list-title')[0].text
s3=soup.body.li.a.attrs['href']
s1=soup.select('.news-list-info')[0].contents[0].text
s2=soup.select('.news-list-info')[0].contents[1].text

web文件：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Simple DOM Demo</title>
</head>

<body>
    <h1>This is the document body</h1>
    <P ID = "p1Node">This is paragraph 1.</P>
    <P ID = "p2Node">段落2</P>
    <a href="http://www.gzcc.cn/">广州商学院</a>

    <li>
        <a href="http://news.gzcc.cn/html/2018/xiaoyuanxinwen_0328/9113.html">
            <div class="news-list-text">
                <div class="news-list-title" style="">我校校长杨文轩教授讲授新学期“思政第一课”</div>
                <div class="news-list-description">3月27日下午，我校校长杨文轩教授在第四教学楼310室为学生讲授了新学期“思政第一课”。</div>
                <div class="news-list-info"><span><i class="fa fa-clock-o"></i>2018-03-28</span><span><i class="fa fa-building-o"></i>马克思主义学院</span></div>
            </div>
        </a>
    </li>
</body>
</html>