[Python-Dev] ABCs and MRO

Terry Reedy tjreedy at udel.edu
Tue Mar 3 18:30:54 CET 2009

Nick Coghlan wrote:
> Terry Reedy wrote:

>> OK, that suggests that the new feature should only be committed, if
>> ever, to 2.7 after 3.1, when it can also be committed to 3.2 at the same
>> time.
> Not really - there's already stuff in 3.0 that wasn't backported the
> first time around. 

Irrelevant.  It is intended that Py3 have features that never appear in 
Py2.  My suggestion is aimed at avoiding the possibility that a new 
feature such as simplegeneric appear in 2.7 and *not* in 3.x.

 > The only thing that I believe *shouldn't* happen is for 2.7
> to be released with new features that aren't yet available in a 3.x release.

Which is the point of my suggestion -- correctly read and understood ;-).


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