[Python-Dev] PEP 435 -- Adding an Enum type to the Python standard library

[R. David Murray]

On Sun, 21 Apr 2013 08:34:39 +1000, Tim Delaney <timothy.c.delaney at gmail.com> wrote:
> On 21 April 2013 04:10, Barry Warsaw <barry at python.org> wrote:
> 
> > On Apr 13, 2013, at 08:37 AM, Tim Delaney wrote:
> >
> > >Just using definition order as the stable iteration order would do the
> > >trick - no need for any comparisons at all. Subclasses (e.g. IntEnum) can
> > >then override it.
> >
> > I think this isn't possible if we want to keep backward compatibility with
> > earlier Pythons, which I want to do.
> 
> Do you want it compatible with Python 2.x? In that case I don't see a way
> to do it - getting definition order relies on __prepare__ returning an
> ordered dict, and __prepare__ of course is only available in 3.x.

It seems strange to limit a new Python3 feature to the Python2 feature
set.  Just saying :)

--David