[Cython] Should we start requiring "language_level=2" for .pyx files?

[Robert Bradshaw]

Language level affects things like integer division (for example).

I agree it makes sense to start putting a warning in.



On Thu, May 31, 2018 at 7:35 AM, Erik Bray <erik.m.bray at gmail.com> wrote:

> On Mon, May 28, 2018 at 8:56 PM, Stefan Behnel <stefan_ml at behnel.de>
> wrote:
> > Hi,
> >
> > Python 3 is clearly taking over the world these days, so it starts
> feeling
> > arcane to require Py2 syntax in .pyx files. Increasingly, it means that
> > people cannot just rename .py files anymore to start optimising them,
> > because the .py file has a high chance of being written in Py3 syntax.
> >
> > Eventually, we will have to switch to Py3 syntax by default in order to
> > follow what most people are (or will be) used to.
> >
> > As a transition, I think we could start warning about cases where the
> > language level is not set explicitly. If people start marking their code
> as
> > being "Cython 2.x code", either with an in-file directive or from their
> > setup.py, we will have less of a problem in the future to change the
> default.
> >
> > What do you think? Any other ideas, comments, objections?
>
>
> Perhaps you could clarify something:  I tried suggesting a while ago
> that Sage start using language_level=3 at least when actually building
> Sage on Python 3.  I know this isn't necessary but it just seemed to
> make logical sense.  But Jeroen was convinced it wasn't necessary
> because, according to him, language_level=3 doesn't really do
> anything.
>
> So what exactly does language_level=3 (or 2) do, such that it would
> impact porting Python 3 code to Cython?
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