On Tue, 2026-02-03 at 10:31 -0700, Nathan via NumPy-Discussion wrote: > Hi all, > > Currently NumPy ships two versions of the Cython headers: one for > Cython > 3.0 and newer (__init__.cython-30.pxd) and one for older versions > (__init__.pxd). > > I'd like to make using the __init__.pxd file a compiler error in > NumPy 2.5 > and force downstream users of the Cython interface to use Cython 3.0 > or > newer.
Yeah, agreed, Cython 3 should be pretty adopted and projects who didn't adopt yet are likely to struggle anyway. Based on the wheels Cython <3 only supports up to Python 3.12 anyway. Technically that means there is overlap with NumPy 2.5, but it is really not much at this point... - Sebastian > > I have a PR open [1] to implement this and generate a compiler error > with > as an explanation as I can for any users of this header. > > The immediate motivator here is needing to touch the Cython bindings > for my > other recent proposal [1]. I'd prefer not to need to worry about > updating > both versions of the Cython headers. > > Beyond my personal desire to avoid doing unnecessary work, IMO having > two > versions of the headers is a recipe for bitrot and latent bugs. > Contributors may or may not be asked to update both versions of the > bindings depending on whether a reviewer remembers that there are two > versions. > > Cython 3.0.0 came out Jul 17, 2023, so when NumPy 2.5 comes out later > this > summer it will have been three years since that release. Dropping > support > this summer would follow our three-year support for CPython. > > If anyone reading this would prefer that we not do this, please reply > here > or on the open pull request to let us know what your concerns are. > Otherwise, I will likely merge my pull request next week. > > -Nathan > > [1] https://github.com/numpy/numpy/pull/30770 > [2] > https://mail.python.org/archives/list/[email protected]/thread/TOFVC2RIXTPJKWVPFVAGET2NDTRMDQQL/ > _______________________________________________ > NumPy-Discussion mailing list -- [email protected] > To unsubscribe send an email to [email protected] > https://mail.python.org/mailman3//lists/numpy-discussion.python.org > Member address: [email protected] _______________________________________________ NumPy-Discussion mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3//lists/numpy-discussion.python.org Member address: [email protected]
