python - 尝试剥离标签时 etree.strip_tags 返回 'None'

Question

脚本:

print entryDetails

for i in range(len(entryDetails)):
    print etree.tostring(entryDetails[i])

    print etree.strip_tags(entryDetails[i], 'entry-details')

输出:

[<Element entry-details at 0x234e0a8>, <Element entry-details at 0x234e878>]
<entry-details>2014-02-05 11:57:01</entry-details>
None
<entry-details>2014-02-05 12:11:05</entry-details>
None

etree.strip_tags 为何无法剥离条目详细信息标签？ 标签名称中的破折号是否会影响它？

Answer 1

strip_tags() 不返回任何内容。它就地剥离标签。

documentation说:“请注意，即使匹配，这也不会删除您传递的元素(或 ElementTree 根元素)。它只会处理其后代。”。

演示代码:

from lxml import etree

XML = """
<root>
 <entry-details>ABC</entry-details>
</root>"""

root = etree.fromstring(XML)
ed = root.xpath("//entry-details")[0]
print ed
print

etree.strip_tags(ed, "entry-details")       # Has no effect 
print etree.tostring(root)
print

etree.strip_tags(root, "entry-details")     
print etree.tostring(root)

输出:

<Element entry-details at 0x2123b98>

<root>
 <entry-details>ABC</entry-details>
</root>

<root>
 ABC
</root>