LXML HTML XPath上下文 [英] Lxml html xpath context

问题描述

我正在使用lxml解析HTML文件，我想知道如何设置xpath搜索的context.我的意思是，我有一个node元素，只想在此节点内进行xpath搜索，就好像它是根节点一样.例如，我有一个表单节点，xpath搜索//input仅返回给定表单的输入，而不返回页面上所有表单的所有输入.我怎样才能做到这一点?我在此处中找到了一些文档，但它没有似乎正是我想要的.

I'm using lxml to parse a HTML file and I'd like to know how can I set the context of xpath search. What I mean I that I have a node element and want to make xpath search only inside this node as if it was the root one. For example, I have a form node and xpath search //input return only inputs of the given form as opposed to all inputs of all forms on the page. How can I do that? I've found some xpath context docs here, but it doesn't seems to be quite what I want.

推荐答案

XPath表达式//input将匹配文档中任何位置的所有输入元素，而.//input将匹配当前上下文中的所有输入元素.

XPath expression //input will match all input elements, anywhere in your document, while .//input will match all inside current context.

也许您可以改善方案说明，我们可以为您提供进一步的帮助.

Maybe if you improve your scenario description we can help you further.

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