Okay, I tried to summarize the discussion and most of my thoughts on that issue. https://github.com/pypa/pip/issues/988

I'll post anything further I have to say there.  I hope to get a student to measure the extent of the problem...

Thanks,
Justin

On Wed, Apr 15, 2015 at 2:44 PM, Jeremy Stanley <fungi@yuggoth.org> wrote:
On 2015-04-15 12:09:04 +0100 (+0100), Robin Becker wrote:
> After again finding that pip doesn't have a correct dependency
> resolution solution a colleage and I discussed the nature of the
> problem.
[...]

Before the discussion of possible solutions heads too far afield,
it's worth noting that this was identified years ago and has a
pending feature request looking for people pitching in on
implementation. It's perhaps better discussed at
https://github.com/pypa/pip/issues/988 so as to avoid too much
repetition.
--
Jeremy Stanley
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