[Python-Dev] PEP 443 - Single-dispatch generic functions (including ABC support) (original) (raw)

Łukasz Langa lukasz at langa.pl
Fri May 31 03:05:46 CEST 2013

On 31 maj 2013, at 01:51, Łukasz Langa <lukasz at langa.pl> wrote:

On 31 maj 2013, at 01:47, Łukasz Langa <lukasz at langa.pl> wrote:

class State: def init(self): self.add.register(int, self.addint) Ouch, I realized this is wrong just after I hit "Send". self.add is a staticmethod so this registration will overload on every instance. Which is obviously bad.

So, after some embarrassing head banging, here's the correct solution:

https://gist.github.com/ambv/5682351

So, it is possible to make instance-level and class-level registration work with the existing @singledispatch code and a bit of plumbing. Obviously, all that is not necessary for actual static methods.

Back to the point, though. I don't feel we should complicate the code, tests and documentation by introducing special handling for methods. In terms of pure type-driven single dispatch, we have a solution that was intentionally simple from the get-go.

The next step will be predicate dispatch anyway ;))

What do you think?

-- Best regards, Łukasz Langa

WWW: http://lukasz.langa.pl/ Twitter: @llanga IRC: ambv on #python-dev

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