[Python-ideas] Put default setstate and getstate on object for use in coöperative inheritance.

[Neil Girdhar]

Good point.

I would like to kindly retract my suggestion and thank everyone for their
input.  In implementing further, I realize that the default getstate I want
returns {} while the current default getstate used when getstate doesn't
exist returns self.__dict__.  Therefore I need a superclass anyway.  Any
comments on my other suggestion to modify __reduce__ so that it takes into
account the __getnewargs_ex__ that was added in Python 3.4 would be much
appreciated.

Best,

Neil


On Sat, Jun 7, 2014 at 7:09 PM, Greg Ewing <greg.ewing at canterbury.ac.nz>
wrote:

> Neil Girdhar wrote:
>
>> Have you tried implementing getstate and setstate with cooperatively
>> inherited classes?  You'll need to call super().__getstate__(), which won't
>> exist, but it really should.
>>
>
> The same issue exists with *any* method that you use in
> a cooperative super call. You need to ensure that there is
> a class at the end of the MRO with a method that terminates
> the super call chain.
>
> It's obviously infeasible to add all such possible methods
> to class object. You will have to provide a *very* strong
> reason why __getstate__ and __setstate__ should be singled
> out for special treatment in this regard.
>
> --
> Greg
>
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