[Distutils] nspkg.pth files break $PYTHONPATH overrides

[Brett Cannon]

On Mon Mar 24 2014 at 6:09:48 PM, Barry Warsaw <barry at python.org> wrote:

> On Mar 24, 2014, at 05:53 PM, Donald Stufft wrote:
>
> >See also https://github.com/pypa/pip/issues/3
>
> Hah, yeah.  I didn't realize --single-version-externally-managed is
> implied by
> --root, and in fact our Debian build scripts often (either explicitly or
> implicitly) define --root, as is the case in lazr.uri.
>
> >Basically prior to PEP420 namespace packages were bad and using them
> results
> >in pain sooner or later :( I’m not sure if a good solution yet, perhaps we
> >can backport PEP420 to PyPI and have namespace packages depend on that?
>
> Or maybe do a version check before installing this file?  Python 3.3 and
> newer
> will have PEP 420 support, and this file makes no sense in that case.
>
> (Backporting PEP 420 support to Python 3.2 might be useful, though a pain
> without importlib.  There's no sense in backporting to Python 3.1, IMHO.)
>

Importlib is in Python 3.2. You would just need to do the right things to
set up the environment and set __import__ to avoid doubling the stat calls
on a failed import.
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