在Python中使用ElementTree发出名称空间规范 [英] Emitting namespace specifications with ElementTree in Python
问题描述
我试图发出带有元素树的XML文件,其中包含XML声明和名称空间。这是我的示例代码:
I am trying to emit an XML file with element-tree that contains an XML declaration and namespaces. Here is my sample code:
from xml.etree import ElementTree as ET
ET.register_namespace('com',"http://www.company.com") #some name
# build a tree structure
root = ET.Element("STUFF")
body = ET.SubElement(root, "MORE_STUFF")
body.text = "STUFF EVERYWHERE!"
# wrap it in an ElementTree instance, and save as XML
tree = ET.ElementTree(root)
tree.write("page.xml",
xml_declaration=True,
method="xml" )
但是,两者都不<?xml
标记也不会出现,也不会显示任何名称空间/前缀信息。
However, neither the <?xml
tag comes out nor any namespace/prefix information. I'm more than a little confused here.
推荐答案
尽管文档否则,我只能得到<?xml>
声明通过同时指定xml_declaration和编码。
Although the docs say otherwise, I only was able to get an <?xml>
declaration by specifying both the xml_declaration and the encoding.
您必须在已注册的名称空间中声明节点,才能在文件中的节点上获得名称空间。这是代码的固定版本:
You have to declare nodes in the namespace you've registered to get the namespace on the nodes in the file. Here's a fixed version of your code:
from xml.etree import ElementTree as ET
ET.register_namespace('com',"http://www.company.com") #some name
# build a tree structure
root = ET.Element("{http://www.company.com}STUFF")
body = ET.SubElement(root, "{http://www.company.com}MORE_STUFF")
body.text = "STUFF EVERYWHERE!"
# wrap it in an ElementTree instance, and save as XML
tree = ET.ElementTree(root)
tree.write("page.xml",
xml_declaration=True,encoding='utf-8',
method="xml")
输出(page.xml)
Output (page.xml)
<?xml version='1.0' encoding='utf-8'?><com:STUFF xmlns:com="http://www.company.com"><com:MORE_STUFF>STUFF EVERYWHERE!</com:MORE_STUFF></com:STUFF>
ElementTree也不漂亮。这是输出精美的输出:
ElementTree doesn't pretty-print either. Here's pretty-printed output:
<?xml version='1.0' encoding='utf-8'?>
<com:STUFF xmlns:com="http://www.company.com">
<com:MORE_STUFF>STUFF EVERYWHERE!</com:MORE_STUFF>
</com:STUFF>
您也可以声明默认名称空间,并且不要t需要注册一个:
You can also declare a default namespace and don't need to register one:
from xml.etree import ElementTree as ET
# build a tree structure
root = ET.Element("{http://www.company.com}STUFF")
body = ET.SubElement(root, "{http://www.company.com}MORE_STUFF")
body.text = "STUFF EVERYWHERE!"
# wrap it in an ElementTree instance, and save as XML
tree = ET.ElementTree(root)
tree.write("page.xml",
xml_declaration=True,encoding='utf-8',
method="xml",default_namespace='http://www.company.com')
输出(漂亮的打印间距是我的)
Output (pretty-print spacing is mine)
<?xml version='1.0' encoding='utf-8'?>
<STUFF xmlns="http://www.company.com">
<MORE_STUFF>STUFF EVERYWHERE!</MORE_STUFF>
</STUFF>
这篇关于在Python中使用ElementTree发出名称空间规范的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!