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I built Python directly from the SVN trunk repository with
$ ./configure && make altinstall
I attached the pyconfig.h that was generated. If you need
more info, feel free to ask.

After building and installing, I started up python2.5 and
executed "import xml.sax.expatreader" and then "print
xml.sax.expatreader", and nothing else.

Another thing I tried is "import from", which works.
But importing xml.sax.expatreader directly, as noted above,
does not work.

Here is the log with the "import from" test:
Python 2.5b1 (trunk:47090, Jun 25 2006, 09:59:02) 
[GCC 4.1.2 20060613 (prerelease) (Debian 4.1.1-5)] on linux2
Type "help", "copyright", "credits" or "license" for more
information.
>>> from xml.sax import expatreader
>>> print expatreader
<module 'xml.sax.expatreader' from
'/usr/local/lib/python2.5/xmlcore/sax/expatreader.pyc'>
>>> print xml.sax.expatreader
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'expatreader'