[Python-ideas] [RFC] draft PEP: Dedicated infix operators for matrix multiplication and matrix power

[Michael Mitchell]

I haven't been following this thread too closely, so please stop me if this
has been covered, but has overloading the @ operator as function
composition been considered yet?

An example would be

filter(a @ b, lst)

as opposed to

filter(lambda x: a(b(x)), lst)


On Sun, Apr 6, 2014 at 6:51 PM, Nathaniel Smith <njs at pobox.com> wrote:

> On Mon, Apr 7, 2014 at 12:20 AM, Steven D'Aprano <steve at pearwood.info>
> wrote:
> > On Sun, Apr 06, 2014 at 11:02:00PM +0100, Nathaniel Smith wrote:
> >> On Sun, Mar 16, 2014 at 1:05 PM, Nick Coghlan <ncoghlan at gmail.com>
> wrote:
> >> > Aye, but at the moment it makes sense to wait and see if there is even
> >> > an argument to be had - Nathaniel may decide that even after reviewing
> >> > the question seriously, he doesn't want to propose a right associative
> >> > operator :)
> >>
> >> And indeed, that does seem to be the way things have worked out :-).
> >>
> http://mail.scipy.org/pipermail/numpy-discussion/2014-April/069834.html
> >
> > That's a shame in one way -- for anyone using operator overloading to
> > define their own DSL, there's only ** if you want a right-associative
> > operator to overload. Still, that's an extremely marginal, and
> > hypothetical, use-case. Left-associative it is.
> >
> > Was that the last blocker for the PEP?
>
> Pretty much. Just posted to python-dev:
>    https://mail.python.org/pipermail/python-dev/2014-April/133791.html
>
> -n
>
> --
> Nathaniel J. Smith
> Postdoctoral researcher - Informatics - University of Edinburgh
> http://vorpus.org
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