vinay_sajip at yahoo.co.uk
Tue Feb 4 15:00:13 CET 2014
On Tue, 4/2/14, Nick Coghlan <ncoghlan at gmail.com> wrote:
> It's a higher level of isolation than that offered by *not* installing
> pip into the virtual environments - the two approaches are
> *not* equivalent, and one is *not* clearly superior to the other,
> but rather there are pros and cons to both.
Obviously the two approaches aren't equivalent, or there wouldn't
be anything to discuss. What you haven't yet done is answered
my question about what the cons are of the not-in-venv approach
in the practical "you can't do X, because of Y", sense. What
*practical* problems are caused by a lower level of isolation
exactly, which make the higher level of isolation necessary?
ISTM the pip developers tried to implement -E because it
was (independently of me) seen as a desirable feature, and
Paul said as much, too. If it didn't work for pip, that could well
be because of the specific implementation approach used,
as I've said in my response to Carl.
Rather than talk in abstractions like "higher levels of isolation",
which have an implied sense of goodness, it would be helpful
to spell out specific scenarios (in the X/Y sense I mentioned
before) that illustrate that goodness versus the badness of
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