New submission from Jack Jansen <[email protected]>:
When using a TreeBuilder with a custom factory (returning a subclass of Element
with some extra functionality) there is an issue with findall().
XPaths using an indexed predicate no longer work: the findall() result is
always empty. The attached test script shows the problem.
I have analysed this as far as finding that the issue is in
ElementPath.prepare_predicate.<locals>.select(), the last one. Specifically,
the statement
elems = list(parent.findall(elem.tag))
always returns an empty list (if the Element class is subclassed).
When using Python 2.7 everything works fine. When adding a findall() method to
the Element subclass that simply calls Element.findall() everything also works
fine. I suspect some issue with the _elementtree C implementation but I don't
understand it.
----------
components: Library (Lib)
files: testetns.py
messages: 327385
nosy: jackjansen
priority: normal
severity: normal
stage: needs patch
status: open
title: xml.etree.ElementTree findall() fails when using custom TreeBuilder
type: behavior
versions: Python 3.7
Added file: https://bugs.python.org/file47859/testetns.py
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<https://bugs.python.org/issue34941>
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