René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"xml.etree.ElementTree.SubElement definition is incorrect / inconsistent with C","articleBody":"# Bug report\n\n### Bug description:\n\nThis code runs fine on Python 3.13.7:\n\n```python\nimport xml.etree.ElementTree as ET\nx = ET.Element(\"x\")\nET.SubElement(x, 0, parent=\"0\")\n```\n\nHowever, Pyright *correctly* detects a type error in the `SubElement` call. `SubElement` has this Python signature:\n\n```python\ndef SubElement(parent, tag, attrib={}, **extra):\n```\n\nThe `parent` parameter has already been assigned, so this *should* fail. I believe the fact that it doesn't is because it's actually using a C implementation, and the C implementation has *this* type signature:\n\n```\ndef SubElement(parent, tag, /, attrib={}, **extra):\n```\n\nWhich *does* allow specifying `parent=\"0\"`.\n\nSo I think the solution is just to add that `/` into the Python code.\n\n### CPython versions tested on:\n\n3.13\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-144313\n* gh-144845\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/Timmmm","@type":"Person","name":"Timmmm"},"datePublished":"2026-01-27T10:49:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/144270/cpython/issues/144270"}