[Python-Dev] [Python-3000] RELEASED Python 3.0 final (original) (raw)

Terry Reedy tjreedy at udel.edu
Fri Dec 5 02:36:41 CET 2008

Nick Coghlan wrote:

Terry Reedy wrote:

and this could give some people a mis-impression, most likely negative, as to the magnitude and nature of the change. Most of the code I am now writing would, I believe, run with 2.5 except for print(..., file=xxx). And I know that there was concern for backward compatibility to the point that some changes were rejected (renaming builtins) or delayed (deleting duplicate test asserts) for that reason. So I would soften the statements to "... version of the language that is partially incompatible with... " and "were made without being bound by backward compatibility," I would agree with Terry - while there are backwards incompatibilities, they aren't gratuitous. Then again, Guido does seem to want to discourage people from trying to target the common subset of the two languages instead of using 2to3 as a compilation step from the python3 version.

I am not restricting myself to that subset. There simply is an unchanged core that happens to include what I currently need (except print, which is isolated in one module). I might need 'except x as y:' someday and will use it if I do but so far 'except x:' is enough and back compatible).

tjr

More information about the Python-Dev mailing list