[Python-ideas] Redefining method

[Stephan Houben]

Here is an example of how it could be done.

https://gist.github.com/stephanh42/97b47506e5e416f97f5790c070be7878


Stephan

Op di 31 jul. 2018 01:29 schreef Steven D'Aprano <steve at pearwood.info>:

> On Tue, Jul 31, 2018 at 10:10:32AM +1200, Greg Ewing wrote:
> > Jamesie Pic wrote:
> > >def o.bar(self): ...
> >
> > You could get almost the same effect with
> >
> >    from functools import partial
> >
> >    def bar(self, other_args):
> >       ...
> >
> >    o.bar = partial(bar, o)
>
> Why are you using functools.partial instead of types.MethodType? I'm
> wondering if there is some advantage to partial that I don't recognise.
>
> I'm not sure if there's a functional difference between the two
> approaches, but it makes o.bar a different kind of callable and that
> will probably make a difference to somebody.
>
>
> > But IMO this is nowhere near being a common enough thing to
> > do to justify having special syntax for it.
>
> This sort of thing isn't common because there's no neat, easy, obvious,
> built-in way to do it. If we allowed people to extend classes using the
> syntax
>
>     def classobj.methodname(...): ...
>
>     def instance.methodname(...): ...
>
> people would use the technique more. For good or ill.
>
> I don't question the utility of this technique, but I suspect we prefer
> to *slightly* discourage it by *not* providing a Batteries Included
> solution for this. If you want to do this, we won't stop you, but
> neither will we encourage it by supporting it in syntax or providing a
> standard decorator for it.
>
>
>
> --
> Steve
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