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[Python-Dev] Spreading the Python 3 religion (was Re: PEP 414 - Unicode Literals for Python 3)
Stephen J. Turnbullstephen at xemacs.org
Wed Feb 29 08:23:53 CET 2012
martin at v.loewis.de writes: > One thing that the PEP will certainly achieve is to spread the myth that > you cannot port to Python 3 if you also want to support Python 2.5. That's > because people will accept the "single source" approach as the one right way, > and will accept that this only works well with Python 2.6.Please, Martin, I dislike this idea as much as you do. (There was no-1 from me, though, because I don't work in the context of the claimeduse cases at all, but lots of people obviously find them persuasive.)But in respect of myth-spreading, the problem with the PEP is thepolemic tone. (Yeah, I've seen Armin's claim that it's not polemic.I disagree.) The unqualified claims that "2to3 is insufficient" andthe PEP will "enable side-by-side support" of Python 2 and Python 3 bylibraries are too extreme, and really unnecessary in light of Guido'slogic for acceptance.As far as I can see, like 2to3, like u()/b(), this PEP introduces adevice that will be the most *convenient* approach for *some* usecases. If it were presented that way, with recommendation for its userestricted to the particular intended use case, I don't think it wouldhave a huge effect on people's perception of the difficulty of portingin general, including multiversion support including 2.5. If otherswant to use it, even though you and I think that's a bad idea, well,we can blog, and "consenting adults" covers those users.On the other hand, implementation of the PEP itself should have apositive effect on the community's perception of python-dev'sresponsiveness to its pain. Ie, a lot of us feel strongly that thisis the wrong thing to do in principle -- but we're gonna do it anyway,because part of the community wants it.So, let's work on integrating this PEP into the more general frameworkof recommendations for porting Python 2 code to Python 3 and/ordeveloping libraries targeting both.
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