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我正在尝试使用 lxml 删除 XML 元素，这些方法似乎还可以，但它不起作用。那是我的代码：

import lxml.etree as le
f = open('Bird.rdf','r')
doc=le.parse(f)
for elem in doc.xpath("//*[local-name() = 'dc' and namespace-uri() = 'http://purl.org/dc/terms/']"):
    parent=elem.getparent().remove(elem)
print(le.tostring(doc))

示例 XML 文件：

<rdf:RDF xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:dc="http://purl.org/dc/terms/"> 

        <wo:Class rdf:about="/nature/life/Bird#class">
                    <dc:description>Birds are a class of vertebrates. They are bipedal, warm-blooded, have a
                        covering of feathers, and their front limbs are modified into wings. Some birds, such as
                        penguins and ostriches, have lost the power of flight. All birds lay eggs. Because birds
                        are warm-blooded, their eggs have to be incubated to keep the embryos inside warm, or
                        they will perish</dc:description>
        </wo:Class>
</rdf:RDF>
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1 回答 1

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您的问题是本地名称是“描述”，而不是“直流”（命名空间别名）。您可以将命名空间传递给 xpath 函数并更直接地编写 xpath，如下所示：

import lxml.etree as le

txt="""<rdf:RDF xmlns:rdf="http://www.w3.org/2000/01/rdf-schema#" xmlns:dc="http://purl.org/dc/terms/"
    xmlns:wo="http:/some/wo/namespace">

    <wo:Class rdf:about="/nature/life/Bird#class">
       <dc:description>Birds are a class of vertebrates. They are bipedal, warm-blooded, have a
                        covering of feathers, and their front limbs are modified into wings. Some birds, such as
                        penguins and ostriches, have lost the power of flight. All birds lay eggs. Because birds
                        are warm-blooded, their eggs have to be incubated to keep the embryos inside warm, or
                        they will perish</dc:description>
    </wo:Class>
</rdf:RDF>
"""

namespaces = { 
    "rdf":"http://www.w3.org/2000/01/rdf-schema#",
    "dc":"http://purl.org/dc/terms/",
    "wo":"http:/some/wo/namespace" }

doc=le.fromstring(txt)
for elem in doc.xpath("//dc:description", namespaces=namespaces):
    parent=elem.getparent().remove(elem)
print(le.tostring(doc))
于 2013-04-12T15:55:49.697 回答