On Fri, Jul 25, 2008 at 6:50 PM, Greg Ewing <[EMAIL PROTECTED]> wrote: > Sebastien Loisel wrote: > >> What are the odds of this thing going in? > > I don't know. Guido has said nothing about it so far this > time round, and his is the only opinion that matters in the > end.
I'd rather stay silent until a PEP exists, but I should point out that last time '@' was considered as a new operator, that character had no uses in the language at all. Now it is the decorator marker. Therefore it may not be so attractive any more. I understand that you can't use A*B as matrix multiplication because it should mean elementwise multiplication instead, just like A+B is elementwise addition (for matrixes, as opposed to Python sequences). But would it be totally outlandish to propose A**B for matrix multiplication? I can't think of what "matrix exponentiation" would mean... --Guido > I may write a PEP about this. However, since yesterday I've > realised that there's a rather serious problem with part > of my proposal. > > The problem is that being able to multiply matrices isn't > much use without also being able to add them and multiply > them by numbers, which obviously can't work with the > built-in sequence types, since they already have other > meanings for + and *. > > However, I still think that adding an @ operator for numpy > to use is a good idea. So I'm now suggesting that the > operator be added, with the intended meaning of matrix > multiplication, but that no implementation of it be > provided in core Python. > > There is a precedent for this -- the ellipsis notation was > added purely for use by Numeric and its successors, and > nothing in core Python attaches any meaning to it. > >> How do the PEPs work? > > Someone writes a PEP. People talk about it. Eventually, Guido > either accepts it or rejects it (although in some cases it > is an infinitely long time before that happens:-). > > -- > Greg > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > http://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > http://mail.python.org/mailman/options/python-dev/guido%40python.org > -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
