解決python-xml 模組 在ubuntu karmic中找不到的問題

如下錯誤：
 from xml.dom.ext.reader.Sax2 import FromXmlStream
ImportError: No module named ext.reader.Sax2

轉自：https://bugs.launchpad.net/ubuntu/+source/python-xml/+bug/343242

runo Harbulot wrote on 2009-11-29:

#22

Going
back to Windows just because of this seems a bit radical. If PyXML is
what's required, doing the following seems rather straightforward
compared with some DLL conflicts:

1. Download PyXML-0.8.4.tar.gz from http://sourceforge.net/projects/pyxml/files/
2. You may need to install python2.6-dev, for example via: sudo apt-get
install python2.6-dev
3. Use these commands:
tar xvzf PyXML-0.8.4.tar.gz
cd PyXML-0.8.4
wget http://launchpadlibrarian.net/31786748/0001-Patch-for-Python-2.6.patch
patch -p1 < 0001-Patch-for-Python-2.6.patch
sudo python2.6 setup.py install

I still reckon PyXML should be packaged in its own package (if the
other things in python-xml are broken). I think the patch is easy
enough for it to be dealt with as part of the packaging process.
Libxml2 may be the modern way to do XPath in Python, but having all the
legacy applications (whether-or-not packaged by Debian/Ubuntu) that
currently rely on PyXML change their code to use libxml2 sounds like a
lot of work, possibly unrealistic.