[Distutils] [Catalog-sig] Prototype setuptools-specific PyPI index.

"Martin v. Löwis" martin at v.loewis.de
Tue Jul 24 20:21:11 CEST 2007

>> > Because if case actually made a difference, we couldn't have both
>> > packages installed in the same directory, could we?
>> Right. However, there is a difference between case-insensitive,
>> and case-preserving.
> I don't understand your statement here, nor what is supposed to follow
> from it.

Clearly, on a case-insensitive file system, project names differing
only in case cannot coexist. That doesn't mean that all references
to the project should be case-normalized (e.g. lower-cased).

So even if project names compare case-insensitive, there still
should (could) be a "right" spelling, the one that the package
author wants to see. This is the spelling that others then should

So I still don't see why the file names on disk have any effect
on the lookup setuptools do to the index.

> Jim's objection was that if it's possible to get case-correction from
> the index, people will declare setup.py dependencies with incorrect
> case, leading to other packages having indirect dependencies with
> incorrect case, leading to lots of package index lookups.

I don't think that was his objection. IIUC, he complains about
incorrect spellings as bad, period - regardless of whether they also
have a performance effect. It's like spelling your name "Philipp" -
that's a bad thing to do, independent of whether it also makes you
harder to find (which it actually doesn't, thanks to Google).

> This objection is relevant only to requirements which differ from the
> actual project name only by their case.  A non-registered package lookup
> is going to fail no matter what, and thus isn't going to wind up in a
> setup.py without a dependency_links specifier that will prevent it being
> looked up in the package index to begin with.

Right. However, if setuptools would stop making case insensitive
lookups to the index, lookups to unregistered packages would become
more efficient.


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