[Python-Dev] Python-versus-CPython question for mul dispatch (original) (raw)

Nick Coghlan ncoghlan at gmail.com
Sat May 16 10:16:37 CEST 2015

On 15 May 2015 at 16:53, Nathaniel Smith <njs at pobox.com> wrote:

On Thu, May 14, 2015 at 9:29 PM, Guido van Rossum <guido at python.org> wrote:

I expect you can make something that behaves like list by defining mul and rmul and returning NotImplemented. Hmm, it's fairly tricky, and part of the trick is that you can never return NotImplemented (because you have to pretty much take over and entirely replace the normal dispatch rules inside mul and rmul), but see attached for something I think should work. So I guess this is just how Python's list, tuple, etc. work, and PyPy and friends need to match...

No, CPython is broken.

Cheers, Nick.

-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia

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