[Python-Dev] PEP 376 and PEP 302 - allowing import hooks to provide distribution metadata

[Nick Coghlan]

Paul Moore wrote:
> 2009/7/4 Brett Cannon <brett at python.org>:
>>> (runpy is also a lot happier with
>>> them when they expose get_filename(), a relatively recent addition to
>>> the PEP 302 API).
>> An addition I was not even aware of. Looks like importlib needs a little
>> updating.
> 
> Yes, I didn't notice that sneak into PEP 302, either :-)

I probably should have been noisier about that when I added it. I'm
pretty sure it did come up on this list, but it would have been
somewhere in the middle of a runpy discussion: runpy was stuck because
it only uses PEP 302 to *find* the modules it needs, but not to actually
load them. In the original version of PEP 302 the only way to get a
loader to tell you the filename was to load the module and see what it
set __file__ to, which wasn't useful in the runpy case.

If I recall correctly, at the time when PJE was rationalising the code
duplication between runpy and pkglib the comment was also made that
runpy's get_filename() optional loader extension should be mentioned in
PEP 302. runpy still works for loaders that don't provide it, it just
can't set __file__ or sys.argv[0] correctly in those cases.

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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