[Python-Dev] PEP 447: add type.__locallookup__

[Guido van Rossum]

OK, how much time do you need?

--Guido van Rossum (sent from Android phone)
On Sep 9, 2013 8:44 AM, "Mark Shannon" <mark at hotpy.org> wrote:

> I would like time to investigate this further, but at the moment I think
> it will either make attribute lookup poorly defined or slow.
>
> Of the top of my head, the problem as a I see it is basically this:
> Currently, type.__getattribute__() is a fixed point in the lookup of
> attributes.
> The proposal means that a fixed point is not reached until the cls
> parameter of type.__getattribute__() is either object or type,
> otherwise type.__getattribute__() and type.__locallookup__ must bounce
> back and forth.
>
> This will slow down *every* attribute lookup for what is a fairly obscure
> use case.
>
> Cheers,
> Mark.
>
> On 09/09/13 16:27, Guido van Rossum wrote:
>
>> Let's just accept this PEP. It looks like a nice addition to the
>> metaclass machinery and I don't think we'll get much more useful feedback
>> by waiting.
>>
>>
>> On Mon, Sep 9, 2013 at 7:30 AM, Ethan Furman <ethan at stoneleaf.us <mailto:
>> ethan at stoneleaf.us>> wrote:
>>
>>     On 07/30/2013 11:17 PM, Ronald Oussoren wrote:
>>
>>
>>         And something I forgot to ask: is anyone willing to be the
>> BDFL-Delegate for
>>         PEP 447?
>>
>>
>>     *Bump*.
>>
>>     It would be nice if this could make into 3.4.
>>
>>     --
>>     ~Ethan~
>>
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>> --
>> --Guido van Rossum (python.org/~guido <http://python.org/~guido>)
>>
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