[Distutils] PEP 517 again

Daniel Holth dholth at gmail.com
Thu Aug 31 11:57:36 EDT 2017

I'm not against renaming a wheel to adjust the tags, but it is a strange
caching strategy. wheel is due for a 'retag' feature that does a more
rigorous job of changing tags.

The build system should name its wheels correctly. Normally the pyNN tag
would be used for a pure distribution and the cpNN tag when there are
extensions. If you want to affect the tagging when called through PEP 517,
edit the source's pyproject.toml / setup.cfg / setup.py.

It will probably always make sense to use pip to build wheels when you want
to build wheels for a project and all its dependencies. Then you can keep
these wheels in a folder for repeatable offline deployment.

On Thu, Aug 31, 2017 at 11:48 AM Chris Barker - NOAA Federal <
chris.barker at noaa.gov> wrote:

> > that neither pip nor the setuptools backend should not change the tags
> > it applies to wheels by default).
> I'm a bit confused -- are we talking about the backwards compatible
> path to the future -- or the end-game?
> In short -- I'm sure we'll have to do some hacky stuff to keep
> backwards compatibility, but the end game should be a clean separation
> of concerns :
> Pip (or any front end) should never "build a wheel", and it certainly
> shouldn't have to know enough about what's in a wheel to be re-naming
> it for generic python vs cpython.
> The package manager should manage the package, not built it, or change it.
> Surely the build system should know how to correctly name the wheel it
> builds.
> As to using pip to build wheels -- there is good reason to do that
> now, but in s post PEP 517 world, one would call the build system
> directly to build a wheel-- after all, all pip should be  doing is
> calling the build system anyway.
> -CHB
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> Distutils-SIG maillist  -  Distutils-SIG at python.org
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