[Python-Dev] [Python-3000] Warning for 2.6 and greater (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Mon Jan 15 23:08:21 CET 2007

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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