[Catalog-sig] Python Version support in PyPI

[Aaron Meurer]

We had a problem with SymPy where we have separate tarballs for Python
2 and Python 3 (our 2to3 process uses git metadata, so we prefer to do
it at release time rather than have the user do it).  But pip was
attempting to install the Python 2 version in both Python 2 and Python
3.  The solution (workaround really) was to upload a tarball for each
Python 3 version, named like sympy-0.7.2-py3.2.tar.gz,
sympy-0.7.2-py3.3.tar.gz (see
https://pypi.python.org/pypi/sympy/0.7.2).  Then pip will install that
version if and only if it is in that specific Python 3 version.

The downside is that easy_install doesn't recognize this, and still
tries to install in Python 2.  I don't know how to make that work.
This is related to the other discussion on this list about making
pip/easy_install stop trying to get metadata from filenames.

Aaron Meurer

On Wed, Feb 27, 2013 at 12:03 PM, Monty Taylor <mordred at inaugust.com> 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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