[Import-SIG] New PEP draft: "Simplified Package Layout and Partitioning"

[Barry Warsaw]

One other quick thought about __file__.

A common use case for it is for debugging purposes.  E.g. a user may say "I'm
getting a different foo package than I expected" and that's causing problems
with their application.   Commonly, we'll say to run this:

$ python -c "import foo; print foo.__file__"

to prove where they got it from.  While I still think this makes sense to
print None for pure-virtuals, I might still want to know something about where
on the file system these things live.  I suppose that if `foo` were a
pure-virtual, then this would be better diagnostics:

$ python -c "import foo; print foo.__path__"

since it would tell us what file system paths contributed to the creation of
`foo` as a pure virtual package.

Cheers,
-Barry
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