Bug#528413: python-lxml: AssertionError: Tried to unregister unknown proxy

[Jakub Wilk]

Package: python-lxml
Version: 2.1.5-1
Severity: normal

$ python lookup.py
Exception exceptions.AssertionError: u'Tried to unregister unknown proxy' in 
<Element value at 82fa7ac> ignored
['v1']


The problem does not occur if I somehow keep the another XML document alive
while evaluating the XPath expression.

-- System Information:
Debian Release: squeeze/sid
  APT prefers unstable
  APT policy: (900, 'unstable'), (500, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 2.6.29-1-686 (SMP w/2 CPU cores)
Locale: LANG=C, LC_CTYPE=pl_PL.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages python-lxml depends on:
ii  libc6                  2.9-12            GNU C Library: Shared libraries
ii  libxml2                2.7.3.dfsg-1      GNOME XML library

ii  python-central         0.6.11            register and build utility for Pyt
ii  zlib1g                 1:1.2.3.3.dfsg-13 compression library - runtime

python-lxml recommends no packages.

Versions of packages python-lxml suggests:
pn  python-lxml-dbg               <none>     (no description available)

-- no debconf information

--
Jakub Wilk

from __future__ import with_statement

from lxml import etree

def lookup(dummy, xml_file, id):
    with file(xml_file) as xml_file:
        xml = etree.parse(xml_file)
    return xml.xpath('id(%r)' % id)

ns = etree.FunctionNamespace(None)
ns['lookup'] = lookup

root = etree.XML('<dummy/>')
doc = etree.ElementTree(root)

print root.xpath("lookup('table.xml', 'k1')/value/text()")

ii libxslt1.1 1.1.24-2 XSLT processing library - runtime ii python 2.5.4-2 An interactive high-level object-o

table.xml
Description: XML document