在ElementTree 1.2中禁止名称空间前缀 [英] Suppressing namespace prefixes in ElementTree 1.2
问题描述
在python 2.7(带有etree 1.3)中,我可以在这样的元素上取消XML前缀:
In python 2.7 (with etree 1.3), I can suppress the XML prefixes on elements like this:
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" />'
在1.3中添加了 register_namespace
函数。我正在尝试以与python 2.6的etree版本1.2.6兼容的方式删除前缀。这是我尝试过的方法:
The register_namespace
function was added in 1.3. I'm trying to remove the prefix in a way that is compatible with python 2.6's etree at version 1.2.6. Here's what I've tried:
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,但为空白。有什么办法可以完全删除它们?
This is not what I want. The prefixes are still there but are blank. Is there any way to remove them completely?
推荐答案
查看 python2.6中ElementTree的源代码, :
在 fixtag
函数中进行了硬编码。作为解决方法,这是我所做的:
After looking at the source code for ElementTree in python2.6, the :
is hard coded in the fixtag
function. As a workaround, here's what I did:
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')
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