Question

在python 2.7（使用etree 1.3）中，我可以在这样的元素上禁止XML前缀：

Python 2.7.1 (r271:86832, Jun 16 2011, 16:59:05) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import xml.etree.ElementTree as etree
>>> etree.VERSION
'1.3.0'
>>> something = etree.Element('{http://some.namespace}token')
>>> etree.tostring(something)
'<ns0:token xmlns:ns0="http://some.namespace" />'
>>> etree.register_namespace('', 'http://some.namespace')
>>> etree.tostring(something)
'<token xmlns="http://some.namespace" />'

1.3中添加了register_namespace功能。我试图以与版本1.2.6的python 2.6的etree兼容的方式删除前缀。这是我尝试过的：

Python 2.6.7 (r267:88850, Jul 31 2011, 19:30:54) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import xml.etree.ElementTree as etree
>>> etree.VERSION
'1.2.6'
>>> something = etree.Element('{http://some.namespace}token')
>>> etree.tostring(something)
'<ns0:token xmlns:ns0="http://some.namespace" />'
>>> etree._namespace_map['http://some.namespace'] = ''
>>> etree.tostring(something)
'<:token xmlns:="http://some.namespace" />'

这不是我想要的。前缀仍然存在但是空白。有没有办法彻底删除它们？

Answer 1

查看source code for ElementTree in python2.6后，:在fixtag函数中进行了硬编码。作为一种解决方法，这就是我所做的：

from xml.etree import ElementTree as etree

if etree.VERSION[0:3] == '1.2':
    #in etree < 1.3, this is a workaround for supressing prefixes

    def fixtag(tag, namespaces):
        import string
        # given a decorated tag (of the form {uri}tag), return prefixed
        # tag and namespace declaration, if any
        if isinstance(tag, etree.QName):
            tag = tag.text
        namespace_uri, tag = string.split(tag[1:], "}", 1)
        prefix = namespaces.get(namespace_uri)
        if namespace_uri not in namespaces:
            prefix = etree._namespace_map.get(namespace_uri)
            if namespace_uri not in etree._namespace_map:
                prefix = "ns%d" % len(namespaces)
            namespaces[namespace_uri] = prefix
            if prefix == "xml":
                xmlns = None
            else:
                if prefix is not None:
                    nsprefix = ':' + prefix
                else:
                    nsprefix = ''
                xmlns = ("xmlns%s" % nsprefix, namespace_uri)
        else:
            xmlns = None
        if prefix is not None:
            prefix += ":"
        else:
            prefix = ''

        return "%s%s" % (prefix, tag), xmlns

    etree.fixtag = fixtag
    etree._namespace_map['http://some.namespace'] = None
else:
    #For etree > 1.3, use register_namespace function
    etree.register_namespace('', 'http://some.namespace')

如果这篇文章过时，代码将保持here。

Answer 2

我在文件的顶部创建了一个方法，只需在标记字符串所在的位置使用它。我把它命名为'ns_tag'，但你可以随心所欲地命名它。

def ns_tag(tag):
    return str( ElementTree.QName('http://some.namespace/api/4/', tag) )

示例：

root = ElementTree.fromstring(xml)
success = root.find(ns_tag('success'))
if success.text == 'true':
    for node in root.find(ns_tag('items')):
        id = node.find(ns_tag('id')).text
        ...

Answer 3

为了从标签中删除命名空间，我使用此代码，其中taget对象是TreeBuilder的子类。在开始和结束两种方法中，我们删除了不需要的命名空间。

from xml.etree.ElementTree import XML, XMLParser, tostring, TreeBuilder

class StripNamespace(TreeBuilder):
    def start(self, tag, attrib):
        index = tag.find('}')
        if index != -1:
            tag = tag[index+1:]
        super(StripNamespace, self).start(tag, attrib)
    def end(self, tag):
        index = tag.find('}')
        if index != -1:
            tag = tag[index+1:]
        super(StripNamespace, self).end(tag)

target = StripNamespace()
parser = XMLParser(target=target)
with open("DmsDesc.xml") as f:
    content = f.read()
root = XML(content, parser=parser)
print tostring(root)

简单而漂亮。

Answer 4

这是一个黑客，但这对我来说在Jython 2.5.2上运作良好

    ns=re.match('^\{([^\}]+)\}', mydoc.getroot().tag ).group(1)
    etree._namespace_map[ns]='STRIPME'
    etree.tostring( mydoc.getroot() ).replace( 'STRIPME:', '' )

在ElementTree 1.2中抑制名称空间前缀

4 个答案: