Element.extend hides exceptions from underlying generators.

[bharel]

Bug report

Bug description:

>>> from xml.etree.ElementTree import Element
>>> Element("a").extend(Element("a") for i in range(10)) # works
>>> Element("a").extend(1/0 for i in range(10)) # throws unrelated TypeError
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: expected sequence, not "generator"

C-implementation only bug.

Submitting a patch...

CPython versions tested on:

3.12, 3.13, CPython main branch

Operating systems tested on:

macOS, Windows

Linked PRs

• gh-123213: Fixed xml.etree.ElementTree.Element.extend and assignment to no longer hide exceptions #123214
• [3.13] gh-123213: Fixed xml.etree.ElementTree.Element.extend and assignment to no longer hide exceptions (GH-123214) #123257
• [3.12] gh-123213: Fixed xml.etree.ElementTree.Element.extend and assignment to no longer hide exceptions (GH-123214) #123258

[bharel]

Also happens on assignment:

>>> Element("a")[:1] = (1/0 for i in range(1))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: expected sequence, not "generator"

Patching up...

[bharel]

Fixed 🎉