+1 -- when we introduced these we didn't see the use case so clearly, but it definitely exists.
On Wed, Jun 20, 2018 at 4:44 AM Steven D'Aprano <st...@pearwood.info> wrote: > On Wed, Jun 20, 2018 at 11:56:05AM +0200, Jeroen Demeyer wrote: > [...] > > Since it makes sense to merge the classes "classmethod" and > > "classmethod_descriptor" (PEP 579, issue 8), one of the above behaviors > > should be changed. Given that adding features is less likely to break > > stuff, I would argue that classmethod instances should become callable. > [...] > > Are there any reasons to *not* make staticmethod and classmethod > callable? > > (The classes themselves are callable -- you're talking about the > instances.) > > +1 yes please! > > The fact that classmethods and especially staticmethod instances aren't > callable has been a long-running niggling pain for me. Occasionally I > want to do something like this: > > class Spam: > @staticmethod > def utility(arg): > # something which is conceptually related to the Spam class > # but doesn't need a cls/self argument. > ... > > value = utility(arg) > > but it doesn't work as staticmethod objects aren't callable until after > they've gone through the descriptor protocol. > > > I'm not the only one bitten by this: > > > https://stackoverflow.com/questions/45375944/python-static-method-is-not-always-callable > > https://mail.python.org/pipermail/python-list/2011-November/615069.html > > Part of that thread, see links and discussion here: > > https://mail.python.org/pipermail/python-list/2011-November/615077.html > > > I thought I had raised a bug report for this on the tracker, but my > google-fu is failing me and I can't find it. But my recollection is that > the simple fix is to make staticmethod.__call__ simply delegate to the > underlying decorated function. And similar for classmethod. > > (Of course calling classmethod instances directly won't work unless you > provide the class argument. But that's just a simple matter of bound > versus unbound methods.) > > > -- > Steve > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --Guido van Rossum (python.org/~guido)
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