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Date: Tue, 03 Feb 2015 15:55:14 -0800
From: Ethan Furman <ethan@stoneleaf.us>
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To: python-list@python.org
Subject: Re: dunder-docs (was Python is DOOMED! Again!)
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On 02/03/2015 03:32 PM, Marko Rauhamaa wrote:
> Gregory Ewing <greg.ewing@canterbury.ac.nz>:
>=20
>> You seem to be suggesting an optimisation that pre-creates bound
>> methods when the instance is created. Keeping a cache of bound methods=

>> would achieve the same thing without changing the semantics. I think
>> CPython might already be doing that, but I'm not sure.
>=20
> No, I'm saying Python should behave differently.
>=20
> Python:
>=20
>    >>> class A:
>    ...    def f(self):
>    ...       print("f")
>    ...    def g(self):
>    ...       print("g")
>    ...=20
>    >>> a =3D A()
>    >>> a.__class__.f =3D a.__class__.g
>    >>> a.f()
>    g
>    =20
> In my preferred semantics, a.f() would print
>=20
>    >>> a.f()
>    f

That is, as you acknowledge, not Python.

Thankfully, it will also never be Python.

However, because Python is so awesome, you can twist your own code to beh=
ave that way, to a point: simply have your
__init__ ( or __new__) populate the instance dict with all non-dunder met=
hods.

Or even better, implement your own proto(mumble) type stack in Python, so=
 there is some warning that your instances
don't behave quite like normal Python instances.

--
~Ethan~


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