gh-144270: make SubElement parent and tag positional-only#144845
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serhiy-storchaka merged 2 commits intopython:mainfrom Mar 30, 2026
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gh-144270: make SubElement parent and tag positional-only#144845serhiy-storchaka merged 2 commits intopython:mainfrom
serhiy-storchaka merged 2 commits intopython:mainfrom
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brijkapadia
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The C accelerator implementations use PyArg_ParseTuple, which inherently enforces positional-only parameters. The Python fallback allowed these as keyword arguments, creating a behavioral mismatch. Make the tag parameter of Element.__init__ and the parent and tag parameters of SubElement positional-only to align with the C accelerator.
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Great. I've squashed the Element change from #144876 into this PR, you can close that one. |
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serhiy-storchaka
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Merged. Thank you for your contribution, @NekoAsakura. |
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…ktor * upstream/main: (119 commits) pythongh-144270: Make SubElement parent and tag positional-only (pythonGH-144845) pythongh-146558: JIT optimize dict access for objects with known hash (python#146559) pythongh-139922: always run MSVC 64-bit tail-calling CI (pythonGH-146570) pythongh-126835: Fix _PY_IS_SMALL_INT() macro (python#146631) pythongh-146587: fix type slot assignment incase of multiple slots for same name (python#146593) pythongh-138122: Add differential flame graph (python#145785) pythongh-146416: Emscripten: Improve standard stream handling in node_entry.mjs (python#146417) pythongh-146444: Don't package as part of iOS 'build hosts' target (python#146628) pythongh-138850: Add --disable-epoll to configure (pythonGH-145768) pythongh-146444: Make Platforms/Apple/ compatible with Python 3.9 (python#146624) pythongh-138577: Fix keyboard shortcuts in getpass with echo_char (python#141597) pythongh-146556: Fix infinite loop in annotationlib.get_annotations() on circular __wrapped__ (python#146557) pythongh-146579: _zstd: Fix decompression options dict error message (python#146577) pythongh-146083: Upgrade bundled Expat to 2.7.5 (python#146085) pythongh-146080: fix a crash in SNI callbacks when the SSL object is gone (python#146573) pythongh-146090: fix memory management of internal `sqlite3` callback contexts (python#146569) pythongh-145876: Do not mask KeyErrors raised during dictionary unpacking in call (pythonGH-146472) pythongh-146004: fix test_args_from_interpreter_flags on windows (python#146580) pythongh-139003: Use frozenset for module level attributes in _pyrepl.utils (python#139004) pythonGH-146527: Add more data to GC statistics and add it to PyDebugOffsets (python#146532) ...
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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/