Bug report

Bug description:

This code runs fine on Python 3.13.7:

importxml.etree.ElementTreeasETx=ET.Element("x")ET.SubElement(x,0,parent="0")

However, Pyrightcorrectly detects a type error in theSubElement call.SubElement has this Python signature:

defSubElement(parent,tag,attrib={},**extra):

Theparent parameter has already been assigned, so thisshould fail. I believe the fact that it doesn't is because it's actually using a C implementation, and the C implementation hasthis type signature:

def SubElement(parent, tag, /, attrib={}, **extra):

Whichdoes allow specifyingparent="0".

So I think the solution is just to add that/ into the Python code.

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Linked PRs

• gh-144270: Fix xml.etree.ElementTree.SubElement signature inconsistency #144313