禁用评论检查＆＃39; - ＆＃39;在lxml中

Question

使用案例：

使用lxml无法解析https://www.banca-romaneasca.ro/en/tools-and-resources/。

...
/opt/python-env/ciur/local/lib/python2.7/site-packages/html5lib/html5parser.py:468: in processComment
    self.tree.insertComment(token, self.tree.openElements[-1])
/opt/python-env/ciur/local/lib/python2.7/site-packages/html5lib/treebuilders/etree_lxml.py:312: in insertCommentMain
    super(TreeBuilder, self).insertComment(data, parent)
/opt/python-env/ciur/local/lib/python2.7/site-packages/html5lib/treebuilders/_base.py:262: in insertComment
    parent.appendChild(self.commentClass(token["data"]))
/opt/python-env/ciur/local/lib/python2.7/site-packages/html5lib/treebuilders/etree.py:148: in __init__
    self._element = ElementTree.Comment(data)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

- src/lxml/lxml.etree.pyx:3017: ValueError: Comment may not contain '--' or end with '-'

来自lxml＆gt; https://github.com/lxml/lxml/blob/master/src/lxml/lxml.etree.pyx#L3017

在https://www.banca-romaneasca.ro/en/tools-and-resources/

中找不到评论

...
<script type="text/javascript" src="/_res/js/forms.js"></script>

<!-- Google Code for Remarketing Tag -->
<!--------------------------------------------------
Remarketing tags may not be associated with personally identifiable information or placed on pages related to sensitive categories. See more information and instructions on how to setup the tag on: http://google.com/ads/remarketingsetup
--------------------------------------------------->
<script type="text/javascript">
/* <![CDATA[ */
var google_conversion_id = 958631629;
var google_custom_params = window.google_tag_params;
... 

请求解决方案：

• 禁用检查（某些魔法，标记，在xml上）

  if b'--' in text or text.endswith(b'-'):
      raise ValueError("Comment may not contain '--' or end with '-'")
  

• 猴子修补（更改代码，注入...）

更新1：

我使用html5lib并希望获得声音，部分，视频等标签，以html5格式提供。

from lxml.html import html5parser, fromstring

context = fromstring(document.content) # work    
context = html5parser.fromstring(document.content) # do not work

context = html5lib.parse(  # do not work
    document.content,
    treebuilder="lxml",
    namespaceHTMLElements=document.namespace,
    encoding=document.encoding
)

版本：

• html5lib == 0.9999999
• lxml == 3.5.0（降级lxml也不是解决方案）

更新2 ::

这似乎是lxml https://github.com/lxml/lxml/pull/172#issuecomment-169084439中的改进/问题。

等待lxml开发人员反馈。

更新3 ::

得到反馈，似乎是html5lib错误，github的最后一个开发版本已经修复了。

Answer 1

已找到解决方案，基于来自github的@opottone：

我尝试从github安装最新的html5parser。现在我只收到警告，而不是错误。

Answer 2

由于这是您尝试解析的HTML数据，请使用lxml.html而不是lxml.etree。

为我工作：

>>> import requests
>>> import lxml.html
>>> 
>>> data = requests.get("https://www.banca-romaneasca.ro/en/tools-and-resources/").content
>>> tree = lxml.html.fromstring(data)
>>> tree.xpath("//title/text()")
['Tools and resources - Banca Romaneasca']