R. David Murray <rdmur...@bitdance.com> added the comment:

It turns out that I had a stray abc.py file in my current working directory as 
the result of some previous tests of module-load-order rules.  That by itself 
wouldn't have triggered the problem, but in addition, I have PYTHONPATH set in 
my environment because I have the hg whitespace hook installed.  Apparently the 
build process turns a non-empty PYTHONPATH into a null entry in the final 
computed PYTHONPATH it uses when hg is called, and this results in anything 
located in the CWD being loaded.

I don't think this rises quite to the level of a security issue, since it 
applies only at build time, but it certainly seems like a bug.

----------
title: ABCMeta import error during build -> build process adds CWD (null entry) 
to PYTHONPATH if PYTHONPATH is set in the build environment
versions: +Python 2.7, Python 3.1, Python 3.2

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<http://bugs.python.org/issue12282>
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