如何返回XPath表达式的单个字符串值？ [英] How to return single string value of XPath expression?

问题描述

这是我的HTML：

 <？xml version =1.0encoding =UTF-8？> ; 
 
< div class =single-main> 
< h3 class =description-area>说明< / h3> 
< p> bla bla bla 
< br />一些文字
< br />这里有一些文字，
< br />其他文字在这里
< / p> 
< / div> 
  

我想要获取整个文本，但只能在一个 XPath表达式中使用

这是我的代码：

  response.xpath（.// / h3 [@ class ='description-area'] / following-sibling :: p 
 // text（）[count（preceding-sibling :: br）> = 0]）。extract（）[ 0] 
  

但它只返回第一个 br .extract（）[0] ，如果我使用.extract（）[1]和[2] ....我会得到我想要的，但是必须使用.extract [0]是因为它是一个可以做到这一点的平台。是否有任何XPath可以返回整个文本，但是只有一个字符串而不是多个字符串？

解决方案

string（/）将会返回整个文档的字符串值。

---

更新：要返回四个单独的字符串通过这个XPath，

  .// h3 [@ class ='description-area'] / following-sibling :: p // text（）[count（before-sibling作为单个字符串，将上面的XPath包装成类似于 
  

code> string（）：

  string（.// h3 [@ class = 'description-area'] / following-sibling :: p // text（）[count（before-sibling :: br）> = 0]）
  

---

更新2 ：但 br 和 text（）操作是不必要的。您只需获取 p 的字符串值：

  string（ .//h3[@class='description-area']/following-sibling::p）
  

This is my HTML:

<?xml version="1.0" encoding="UTF-8"?>

<div class="single-main"> 
  <h3 class="description-area">Description</h3>  
  <p>bla bla bla
    <br/> some text 
    <br/> some text here ,
    <br/> other text here
  </p> 
</div>

I want to get the whole text but in one XPath expression.

This is my code:

response.xpath(".//h3[@class='description-area']/following-sibling::p
                //text()[count(preceding-sibling::br) >= 0]").extract()[0]

but it returns just the text before the first br (I know why, and that's because I am using .extract()[0] and if i used .extract()[1] and [2] .... I will get what I want, but I must use .extract[0] because it is a platform that does just that. Is there any XPath to return the whole text but in one string rather than in multiple strings?

解决方案

string(/) will return the string value of the whole document.

---

Update: To return the four separate strings returned by this XPath,

.//h3[@class='description-area']/following-sibling::p//text()[count(preceding-sibling::br) >= 0]

as a single string, wrap the above XPath similarly in string():

string(.//h3[@class='description-area']/following-sibling::p//text()[count(preceding-sibling::br) >= 0])

---

Update 2: But the br and text() maneuvers aren't necessary. You can simply get the string value of the p:

string(.//h3[@class='description-area']/following-sibling::p)

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