[Python-Dev] Listing of PEP 328 status and possible minor oversight

[Brett Cannon]

On 12/20/06, Thomas Wouters <thomas at python.org> wrote:
>
>
>
> On 12/20/06, Brett Cannon <brett at python.org> wrote:
> >
> > I just noticed that PEP 328 (relative imports) is listed as an accepted
> > PEP, but not completed.  Is this because there is still things to do for
> > 2.6 and 2.7?  Or did someone just forget to move it to the completed
> > PEPs section of the PEP index?  If it is the former then PEP 362 will need
> > to be moved.
>
>
> There was some minor finagling about the wording of the PEP, I think, that
> I was still supposed to do. Some explanation of common practices, maybe; the
> python-dev archives might have it. I could never get it into the PEP the
> right way, the end result was never that big a change (and a bit awkward
> with the rest.)
>
> I also noticed that there is no mention of removing import redirection to
> > a top-level module by having None in sys.modules.  Was this for
> > backwards-compatibility issues, or was it just not thought of?
>
>
> I don't think I've ever heard of that idea. I don't know what 'import
> redirection' is either. But maybe it was one of those things that were still
> supposed to go into PEP 328.
>

So if sys.modules has an entry of None for a dotted name then import is
supposed to stop trying to import that name and instead import a top-level
name.  This happens if you do ``import string`` from within a package and
there is no 'string' module there.  This leads to sys.modules['pkg.string']
being None and thus redirecting to sys.modules['string'].  This is only
useful for classic relative import semantics and thus can probably go once
absolute imports are the only way to do imports.

-Brett
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.python.org/pipermail/python-dev/attachments/20061220/6ddaf348/attachment.htm