gh-144270: make SubElement parent and tag positional-only#144845
Open
NekoAsakura wants to merge 2 commits intopython:mainfrom
Open
gh-144270: make SubElement parent and tag positional-only#144845NekoAsakura wants to merge 2 commits intopython:mainfrom
NekoAsakura wants to merge 2 commits intopython:mainfrom
Conversation
|
All commit authors signed the Contributor License Agreement. |
|
Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool. If this change has little impact on Python users, wait for a maintainer to apply the |
The C accelerator in _elementtree.c uses PyArg_ParseTuple, which makes parent and tag positional-only. The Python fallback in ElementTree.py allowed them as keyword arguments, creating an inconsistency. Most users never noticed because the C version overrides the Python version via "from _elementtree import *". Add "/" after tag in the Python signature to match the C behavior. The attrib parameter remains keyword-capable since the C version accepts it via get_attrib_from_keywords().
NekoAsakura
force-pushed
the
gh-144270-subelement-positional-only
branch
from
d956c30 to
1551ff7
Compare
bkap123
reviewed
Feb 16, 2026
Co-authored-by: bkap123 <97006829+bkap123@users.noreply.github.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Issue: #144270
Make
parentandtagpositional-only inxml.etree.ElementTree.SubElementto match the C accelerator.The C implementation (
_elementtree.SubElement) usesPyArg_ParseTuple, which inherently makesparentandtagpositional-only. The Python fallback useddef SubElement(parent, tag, attrib={}, **extra):which allowedparentandtagas keyword arguments. This inconsistency meantSubElement(parent=e, tag="x")worked only when the C accelerator was unavailable.Fix: add
/aftertag→def SubElement(parent, tag, /, attrib={}, **extra):Changes
Lib/xml/etree/ElementTree.py: add/toSubElementsignatureLib/test/test_xml_etree.py: addtest_subelementcovering positional-only enforcement, keyword attrib, and kwargs-as-XML-attributes parityDoc/library/xml.etree.elementtree.rst: update signature and addversionchanged:: 3.15Note
Element.__init__has the same Python/C signature mismatch —tagis positional-only in the C version (PyArg_ParseTupleat_elementtree.c:419) but accepts keywords in the Pythonfallback (
ElementTree.py:167). I will create a separate issue for that to keep this PR focused.cpython/Lib/xml/etree/ElementTree.py
Line 167 in 23c488d
cpython/Modules/_elementtree.c
Lines 419 to 420 in 23c488d
📚 Documentation preview 📚: https://cpython-previews--144845.org.readthedocs.build/