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

Tim Delaney tcdelaney at optusnet.com.au
Fri Jan 12 22:04:59 CET 2007

Georg Brandl wrote:

Martin v. Löwis schrieb:

What does that mean for the example James gave: if dict.items is going to be an iterator in 3.0, what 2.x version can make it return an iterator, when it currently returns a list? There simply can't be a 2.x version that introduces the new way, as it is not merely a new API, but a changed API. Well, that is one of the cases in which that won't be possible ;)

Yes - but dict.items() isn't going to just return an iterator - it will return a view. For most uses of dict.items(), this means there will not need to be any code change.

I'm wondering if we might be going the wrong way about warning about compatibility between 2.x and 3.x. Perhaps it might be better if the 3.0 alpha had a 2.x compatibility mode command-line flag, which is removed late in the beta cycle.

Tim Delaney

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