Re: Python Version support in PyPI

The Classifier: Python ... is another tag that could be more likely to
tell you what you want to know. Hopefully the new, broken package
advertises Classifier: Python 3 only. In theory I don't like the idea
of using the Trove classifiers for anything automatic, but at least
people tend to specify them.

On Wed, Feb 27, 2013 at 2:30 PM, Monty Taylor <[email protected]> wrote:
>
>
> On 02/27/2013 02:05 PM, Donald Stufft wrote:
>> 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
>>> _______________________________________________
>>> Catalog-SIG mailing list
>>> [email protected] <mailto:[email protected]>
>>> http://mail.python.org/mailman/listinfo/catalog-sig
>> 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.
>
> Yeah - that's what we're doing now - I think we're just looking towards
> trying to prevent breakage systemically where we can.
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