[Python-Dev] PEP 447: add type.locallookup (original) (raw)

Mark Shannon mark at hotpy.org
Mon Sep 9 17:43:31 CEST 2013

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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