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There is something weird going on with xml.sax
exceptions, probably related to the xml/xmlcore shuffle:
from xml.sax import make_parser, SAXParseException
from StringIO import StringIO
parser = make_parser()
try:
 parser.parse(StringIO('invalid'))
except SAXParseException:
 print 'caught it!'
On python 2.4.3 this prints "caught it!". On python
2.5b1 the exception is not caught, because it is a
different exception: an
xmlcore.sax._exceptions.SAXParseException. Printing the
SAXParseException imported from xml.sax gives "<class
'xml.sax._exceptions.SAXParseException'>".
Stumbled on this running the logilab-common (see
logilab.org) tests with python 2.5b1, but it seems
likely other code will be affected.

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This bug is simmilar to http://python.org/sf/1511497.
It is caused by absolute imports in xmlcore.sax.expatreader.
Patch #1519796 ( http://python.org/sf/1519796 )
should fix it.

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Patch #1519796 does not do anything for this, based on the
current trunk. I've attached a diff containing a test case.

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The patch attached contains the wrong bug number, but it
really is for this issue.

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I've managed to come up with a patch that solves this
specific issue, but it really deals with the symptom and not
the real problems.
While I think the "xmlcore" package was the right idea, I'm
not convinced it can be correctly implemented without
enormous effort at this time. Given the release schedule,
it doesn't make sense to jump through those hoops. The
previous hackery that made allowed the PyXML distribution to
"replace" the standard library version of the "xml" package
worked only because there was only one public name for
whichever was being used. Moving to the "xmlcore" package
proved to be more than that hack could support.
I think the right thing to do for Python 2.5 is to revert
the changes that added the "xmlcore" package. Further
investigation into a better approach can be made for Python 2.6.

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I think Martin is of the same opinion. This needs to be
resolved soon.

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The xmlcore package has been reverted as of revision 50941.
This problem report no longer applies, but a test has been
added as part of the removal of the xmlcore package to
ensure this does not re-surface.