[Catalog-sig] Python Version support in PyPI

[Donald Stufft]

On Wednesday, February 27, 2013 at 2:03 PM, Monty Taylor wrote:
> Hey all,
> 
> OpenStack recently ran in to a problem where one of our depends released
> a new version that only works with Python 3 and not Python 2. While I
> wholeheartedly support the gusto of that, and also can't wait until we
> can move to Python 3, there's a tooling issue here.
> 
> If I'm doing pip install pyparsing from python2, the system should have
> enough information to be able to tell whether or not it's going to be
> getting something that's just fundamentally incompatible - such as a
> version that does not support python2.
> 
> I recognize that it would require the package in question marking itself
> as not supporting python2 ... but let's face it, as we start doing this
> py2-py3 transition in earnest, it's a pretty important piece of metadata
> to know about - and I can't imagine we're going to be the only people
> running in to the problem.
> 
> Anybody got any thoughts on ways we can help with this that won't suck?
> 
> Monty
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> 
> 

The newer peps have support for this via a requires_python field but
the older tools do not support this field. You'll need to version constrain
your downloads manually to remove versions you know are not Py2.
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