[Distutils] PEP 425 vs pip

[David Cournapeau]

On Fri, Mar 11, 2016 at 3:26 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:

> On 11 March 2016 at 19:41, David Cournapeau <cournape at gmail.com> wrote:
> > Hi,
> >
> > At Enthought we have been trying to use PEP 425 tags to include its
> metadata
> > in our packages. It has been harder than expected because of missing
> > information in PEP 425, and maybe inconsistencies with what pip actually
> > does.
> >
> > I think PEP 425 should be updated to take into account pip actual
> > implementation:
> >
> > 1. python tag and pypy: the PEP says "the version is py_version_nodot .
> > CPython gets away with no dot, but if one is needed the underscore _ is
> used
> > instead. PyPy should probably use its own versions here pp18 , pp19 ".
> This
> > is not what pip does as of version 8.1.0 for pypy. Instead, the version
> is
> > python major + sys.pypy_version_info.major + sys.pypy_version_info.minor.
> >
> > 2. It would be nice to know how to deal with other alternative
> > implementations as well. Would the scheme in 1. work for jython, etc... ?
> >
> > 3. The abi tag should at least be specified for cpython IMO. E.g. the
> > meaning of `m`, `u` and `d` should be clearly specified.
> >
> > While the PEP mentions each implementation community is welcome to use
> the
> > abi tag as they wish, given that in practice it is defined in pip, I
> think
> > that should be specified as well.
> >
> > Do the above make sense ? If so, I could spend some time to update it (or
> > create a new amending PEP ?)
>
> Proposed errrata & minor admentments for PEP 425 can be submitted as a
> PyPUG issue with a PR against
>
> https://packaging.python.org/en/latest/specifications/#platform-compatibility-tags
>
> (the actual technical details of the proposed changes should still be
> discussed here)
>

Up: would it help doing the PR first as a basic for discussion ?
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