本文介绍了Python爬虫之BeautifulSoup 使用select方法详解 ，分享给大家。具体如下：
<HTML><head><Title>The Dormouse's story</Title></head><body><p name="dromouse"><b>The Dormouse's story</b></p><p >Once upon a time there were three little sisters; and their names were<a href="http://example.com/elsIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ID="link1"><!-- ElsIE --></a>,<a href="http://example.com/lacIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" ID="link2">LacIE</a> and<a href="http://example.com/tillIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" ID="link3">TillIE</a>;and they lived at the bottom of a well.</p><p >...</p>"""
我们在写 CSS 时，标签名不加任何修饰，类名前加点，ID名前加 #，在这里我们也可以利用类似的方法来筛选元素，用到的方法是 soup.select()，返回类型是 List
（1）通过标签名查找
print soup.select('Title') #[<Title>The Dormouse's story</Title>] print soup.select('a')#[<a href="http://example.com/elsIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ID="link1"><!-- ElsIE --></a>,<a href="http://example.com/lacIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" ID="link2">LacIE</a>,<a href="http://example.com/tillIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" ID="link3">TillIE</a>] print soup.select('b')#[<b>The Dormouse's story</b>]（2）通过类名查找
print soup.select('.sister')#[<a href="http://example.com/elsIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ID="link1"><!-- ElsIE --></a>,<a href="http://example.com/tillIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" ID="link3">TillIE</a>]（3）通过 ID 名查找
print soup.select('#link1')#[<a href="http://example.com/elsIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ID="link1"><!-- ElsIE --></a>]（4）组合查找
组合查找即和写 class 文件时，标签名与类名、ID名进行的组合原理是一样的，例如查找 p 标签中，ID 等于 link1的内容，二者需要用空格分开
print soup.select('p #link1')#[<a href="http://example.com/elsIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ID="link1"><!-- ElsIE --></a>]直接子标签查找
print soup.select("head > Title")#[<Title>The Dormouse's story</Title>]（5）属性查找
查找时还可以加入属性元素，属性需要用中括号括起来，注意属性和标签属于同一节点，所以中间不能加空格，否则会无法匹配到。
print soup.select("head > Title")#[<Title>The Dormouse's story</Title>] print soup.select('a[href="http://example.com/elsIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ]')#[<a href="http://example.com/elsIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ID="link1"><!-- ElsIE --></a>]同样，属性仍然可以与上述查找方式组合，不在同一节点的空格隔开，同一节点的不加空格
print soup.select('p a[href="http://example.com/elsIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ]')#[<a href="http://example.com/elsIE" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ID="link1"><!-- ElsIE --></a>]以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程小技巧。
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