Python lxml XPath问题

发布于 2024-10-22 21:25:12 字数 715 浏览 5 评论 0原文

我正在尝试从网页打印/保存某个元素的 HTML。
我已经从 firebug 检索了请求元素的 XPath。

我所希望的只是将此元素保存到文件中。我似乎没有成功这样做。
（最后尝试了带或不带 /text() 的 XPath）

我将不胜感激任何帮助或过去的经验。
10x，大卫

import urllib2,StringIO
from lxml import etree

url='http://www.tutiempo.net/en/Climate/Londres_Heathrow_Airport/12-2009/37720.htm'
seite = urllib2.urlopen(url)
html = seite.read()
seite.close()
parser = etree.HTMLParser()
tree = etree.parse(StringIO.StringIO(html), parser)
xpath = "/html/body/table/tbody/tr/td[2]/div/table/tbody/tr[6]/td/table/tbody/tr/td[3]/table/tbody/tr[3]/td/table/tbody/tr/td/table/tbody/tr/td/table/tbody/text()"
elem = tree.xpath(xpath)


print elem[0].strip().encode("utf-8")

原文

I'm trying to print/save a certain element's HTML from a web-page.
I've retrieved the requested element's XPath from firebug.

All I wish is to save this element to a file.
I don't seem to succeed in doing so.
(tried the XPath with and without a /text() at the end)

I would appreciate any help, or past experience.
10x, David

import urllib2,StringIO
from lxml import etree

url='http://www.tutiempo.net/en/Climate/Londres_Heathrow_Airport/12-2009/37720.htm'
seite = urllib2.urlopen(url)
html = seite.read()
seite.close()
parser = etree.HTMLParser()
tree = etree.parse(StringIO.StringIO(html), parser)
xpath = "/html/body/table/tbody/tr/td[2]/div/table/tbody/tr[6]/td/table/tbody/tr/td[3]/table/tbody/tr[3]/td/table/tbody/tr/td/table/tbody/tr/td/table/tbody/text()"
elem = tree.xpath(xpath)


print elem[0].strip().encode("utf-8")

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榕城若虚 2024-10-29 21:25:12

您的 XPath 显然有点太长了，为什么不尝试较短的 XPath 并看看它们是否匹配。一个问题可能是“tbody”，它由浏览器在 DOM 中自动创建，但 HTML 标记通常不包含它。

以下是如何使用 XPath 结果的示例：

>>> from lxml import etree
>>> from StringIO import StringIO
>>> doc = etree.parse(StringIO("<html><body>a<something/>b</body></root>"), etree.HTMLParser())
>>> doc.xpath("/html/body/text()")
['a', 'b']

因此，如果需要，您可以将所有文本部分 "".join(...) 组合在一起。

Your XPath is obviously a bit too long, why don't you try shorter ones and see if they match. One problem might be "tbody" which gets automatically created in the DOM by browsers but the HTML markup usually does not contain it.

Here's an example of how to use XPath results:

>>> from lxml import etree
>>> from StringIO import StringIO
>>> doc = etree.parse(StringIO("<html><body>a<something/>b</body></root>"), etree.HTMLParser())
>>> doc.xpath("/html/body/text()")
['a', 'b']

So you could just "".join(...) all text parts together if needed.

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