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GH-113425: Add example for default_namespace in ElementTree docs #147976

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GH-113425: Add example for default_namespace in ElementTree docs #147976

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20 changes: 19 additions & 1 deletion Doc/library/xml.etree.elementtree.rst
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Expand Up @@ -365,8 +365,26 @@ These two approaches both output::
|--> Gunther
|--> Commander Clement

Serializing XML with Default Namespace
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

.. _elementtree-xpath:
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@merwok merwok Apr 1, 2026

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Please keep the target for the following section

When serializing XML that contains a default namespace, ElementTree will by
default add a generated prefix (such as ``ns0``) instead of preserving the
default namespace. For example::
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@merwok merwok Apr 1, 2026

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I don’t agree with the phrasing here! (after instead of)


>>> root = ET.fromstring("<doc xmlns='http://example.com'><p>text</p></doc>")
>>> print(ET.tostring(root, encoding='unicode'))
<ns0:doc xmlns:ns0="http://example.com"><ns0:p>text</ns0:p></ns0:doc>

To preserve the default namespace during serialization, use the
*default_namespace* parameter with :func:`tostring` or :meth:`ElementTree.write`::

>>> root = ET.fromstring("<doc xmlns='http://example.com'><p>text</p></doc>")
>>> print(ET.tostring(root, encoding='unicode', default_namespace='http://example.com'))
<doc xmlns="http://example.com"><p>text</p></doc>

.. versionadded:: 3.8
The *default_namespace* parameter.

XPath support
-------------
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