Python 3

[Russel Winder]

Martin,

On Wed, 2010-06-23 at 11:01 +1000, Martin Pool wrote:

> On the other hand, Robert's patch has things like
> 
> -except locale.Error, e:
> +except locale.Error:
> +    e = sys.exc_info()[1]
> 
> which is clearly worse, and clearly also the kind of thing that can be
> easily mechanically translated by 2to3.  I wouldn't like to see that
> kind of thing merged until we've decided we really want a single
> codebase that works on both with no translation.

I think this post and all subsequent issues regarding this code fragment
are based on the wrong assumption and so much of it is effectively
wrong.  The recommended transformation is:

except locale.Error , e :

->

except locale.Error as e :

which is clearly more or less a no-op.  If 2-3 generates anything else
then it is broken.

Clearly the issue of supporting pre-2.6 Python have an impact here but
only if you are trying to use a single code base to deal with Pythons
1.5 -> 2.6.  The SCons folk seem to be the real masters at doing this,
but they have just given up on Pythons 1.5, 2.0->2.3 and now have 2.4 as
a floor.  The issue of Python 3 is now arising but not being addressed
just yet.  They do have a very interesting approach to using a single
code base for all supported Pythons, that might be useful input to the
debate -- or not.  Just a thought.


-- 
Russel.
=============================================================================
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel at russel.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder
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