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Wed Nov 4 07:43:06 CET 2009 · https://mail.python.org/pipermail/python-dev/2009-November/093706.html

2009/11/3 Charles Cazabon <charlesc-lists-python-dev at pyropus.ca>:
> "Martin v. Löwis" <martin at v.loewis.de> wrote:
>  It's pretty easy to make Python source that works under 2.6 and 3.x.  It's
>  basically impossible to make Python source that works under 2.4/2.5 and
>  3.x.

Without using 2to3, yes.

See http://code.google.com/p/python-incompatibility/ where I've
attempted to document most 2.5/3.0 incompatibilities and explain how
to get around them to run the same unmodified code under 2.6 and 3.0.

(It's not complete, help appreciated, especially with the C-API part)

> No.  getmail v.4 runs fine on Python 2.3.4 through 2.6.x; getmail's code has
> always been pretty forward-compatible.

Then it's going to be dead easy to support both 2.x and 3.x by using 2to3.

If you don't want to have separate packages youcan use distribute:
http://packages.python.org/distribute/python3.html

Also see my talk at PyCon: http://pycon.blip.tv/file/1949281/

-- 
Lennart Regebro: Python, Zope, Plone, Grok
http://regebro.wordpress.com/
+33 661 58 14 64

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[Python-Dev] 2.7 Release? 2.7 == last of the 2.x line?