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Mon Jan 15 23:08:21 CET 2007 · https://mail.python.org/pipermail/python-dev/2007-January/070643.html

>     Why do you think that this would be that certainly possible?
>     I cannot imagine an efficient implementation.
> 
> 
> Ah, but can you imagine an inefficient one? 

I think so (although one can never know until it's implemented).

> If so, we're no longer
> arguing about whether it's possible, but whether we want to pay the
> price. Given that the dict.keys/values/items change hasn't been written
> and only broadly designed, it's hard to tell *right now* what we can do
> to ease the transition. I do believe we should be prepared to as much as
> we can, in Python 2.6 and 2.7, to ease it (and the other transitions.)
> That means the 2to3 tool and warnings in appropriate places, and
> anything else we can do.

I don't think we should do *everything* we can. If 2.6 performance will
suffer significantly to support 3.x warnings, the price would be too
high.

Regards,
Martin

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[Python-Dev] [Python-3000] Warning for 2.6 and greater