标签： 在 lxml 中的名称中
我正在尝试使用 lxml.etree 来解析 Wordpress 导出文档（它是 XML，有点像 RSS）。我只对已发布的帖子感兴趣，因此我使用以下内容循环浏览已发布的帖子：
for item in data.findall("item"):
if item.find("wp:post_type").text != "post":
continue
if item.find("wp:status").text != "publish":
continue
write_post(item)
其中 data 是在其中找到所有 item 标签的标签。< code>item 标签包含帖子、页面和草稿。我的问题是 lxml 无法找到名称中包含 : 的标签（例如 wp:post_type）。当我尝试 item.find("wp:post_type") 时，出现此错误：
Traceback (most recent call last):
File "<input>", line 1, in <module>
File "lxml.etree.pyx", line 1279, in lxml.etree._Element.find (src/lxml/lxml.e
tree.c:38124)
File "/usr/lib64/python2.7/site-packages/lxml/_elementpath.py", line 210, in f
ind
it = iterfind(elem, path)
File "/usr/lib64/python2.7/site-packages/lxml/_elementpath.py", line 200, in i
terfind
selector = _build_path_iterator(path)
File "/usr/lib64/python2.7/site-packages/lxml/_elementpath.py", line 184, in _
build_path_iterator
selector.append(ops[token[0]](_next, token))
KeyError: ':'
我假设 KeyError : ':' 指的是标签名称中的冒号无效。有什么方法可以转义冒号以便 lxml 找到正确的标签吗？ : 在这种情况下有什么特殊含义吗？或者我做错了什么？任何帮助将不胜感激。
I'm trying to use lxml.etree to parse a Wordpress export document (it's XML, somewhat RSS like). I'm only interested in published posts, so I'm using the following to loop through published posts:
for item in data.findall("item"):
if item.find("wp:post_type").text != "post":
continue
if item.find("wp:status").text != "publish":
continue
write_post(item)
where data is the tag that all item tags are found in. item tags contain posts, pages, and drafts. My problem is that lxml can't find tags that have a : in their name (e.g. wp:post_type). When I try item.find("wp:post_type") I get this error:
Traceback (most recent call last):
File "<input>", line 1, in <module>
File "lxml.etree.pyx", line 1279, in lxml.etree._Element.find (src/lxml/lxml.e
tree.c:38124)
File "/usr/lib64/python2.7/site-packages/lxml/_elementpath.py", line 210, in f
ind
it = iterfind(elem, path)
File "/usr/lib64/python2.7/site-packages/lxml/_elementpath.py", line 200, in i
terfind
selector = _build_path_iterator(path)
File "/usr/lib64/python2.7/site-packages/lxml/_elementpath.py", line 184, in _
build_path_iterator
selector.append(ops[token[0]](_next, token))
KeyError: ':'
I assume the KeyError : ':' refers to the colon in the name of the tag being invalid. Is there some way I can escape the colon so that lxml finds the right tag? Does : have some special meaning in this context? Or am I doing something wrong? Any help would be appreciated.
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:是 XML 命名空间分隔符。要转义 lxml 中的冒号，您需要将其替换为大括号内的命名空间 URL，如item.find("{http://example.org/}status").text中所示。The
:is an XML namespace separator. To escape the colon in lxml, you need to replace it with the namespace URL within curly braces, as initem.find("{http://example.org/}status").text.