René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`Element.__init__` tag parameter has positional-only inconsistency","articleBody":"# Bug report\n\n### Bug description:\n\n`Element.__init__` has the same Python/C signature inconsistency as SubElement (gh-144270).\n\nPython fallback:\nhttps://github.com/python/cpython/blob/23c488d6197191d355be6733699a295c20806932/Lib/xml/etree/ElementTree.py#L167\ntag accepts keyword arguments: Element(tag=\"foo\") works.\n\nC accelerator:\nhttps://github.com/python/cpython/blob/23c488d6197191d355be6733699a295c20806932/Modules/_elementtree.c#L419-L420\nPyArg_ParseTuple only parses positional args, so tag is positional-only. Element(tag=\"foo\") raises TypeError.\n\n### Proposed fix\n```\n-    def __init__(self, tag, attrib={}, **extra):\n+    def __init__(self, tag, /, attrib={}, **extra):\n```\n\nSame pattern as the SubElement fix in gh-144270.\n\n### Reproduce\n```\nimport sys, importlib\nimport xml.etree.ElementTree as ET\n\nroot = ET.Element(\"root\")\n\ntry:\n    ET.Element(tag=\"foo\")\nexcept TypeError:\n    print(\"C rejects Element(tag=...)\")\n\nsys.modules['_elementtree'] = None\nimportlib.reload(ET)\n\ne = ET.Element(tag=\"foo\")\nprint(f\"pure-python accepted it: {e.tag}\") \n```\n\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-144876\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/NekoAsakura","@type":"Person","name":"NekoAsakura"},"datePublished":"2026-02-15T18:23:00.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/144846/cpython/issues/144846"}