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The looming Python 3(000) monster

We're just now dealing with Python 2.6, but over on the radar is perhaps one of the most incompatible upgrades to the language we've seen in Python 3. I personally haven't tried it yet, but it /aims/ to be incompatble, which is perhaps one of the most glaring signs a language designer has lost it that I've seen.


This isn't a huge problem to those who are only developing on the latest Fedora, per-se (other than getting over the initial hump), but it's pretty bad for someone who wants to keep a single codebase across EL 4 (Python 2.3) and up, which I think a lot of us do. That gets to be darn impossible and we have to double our involvement with code because we essentially have to maintain a differently-compatible fork for each project.

(NOTE: this requires the viewpoint that not everyone care just about the latest Fedora, which might be controversial... but to me, the latest Fedora is what I'll run as my dev environment but not everyone can upgrade -- and many folks are also running EL and EPEL deserves our full support and consideration)

So, what of plans?

Are we looking at also carrying on with packaging 2.N indefinitely when we do decide to carry 3, because as I know it, the code changes to make something Python 3 compatible will be severe and that's a big item for any release, and will probably result in some undiscovered bugs even after the initial ports (if applied).

I haven't seen /anything/ regarding a compatibility mode for /usr/bin/python, and I'd hate to have to develop a non-core library that allows for functions that work the same way on both versions and use that instead. That would be heinous.

Short of porting everything over to Ruby, oCaml, or enterprise-Fortran.NET#4000, any ideas on planning for this?


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