[Python-Dev] PyPy, Jython, & IronPython: Enum convenience function and pickleablity (original) (raw)

Nick Coghlan ncoghlan at gmail.com
Sat May 4 03:59:13 CEST 2013

On 4 May 2013 05:17, "Georg Brandl" <g.brandl at gmx.net> wrote:

Am 03.05.2013 11:40, schrieb Steven D'Aprano: > On 03/05/13 18:42, Antoine Pitrou wrote: >> Le Fri, 3 May 2013 09:14:22 +1000, Nick Coghlan <ncoghlan at gmail.com> a >> écrit : > >>> I would suggest moving the field names into the class header for a class >>> based convenience API: >>> >>> class Animal(Enum, members='cat dog'): pass >> >> This looks good to me (assuming some people don't like the special >> attribute scheme). > > The problem is that this is not an expression, it is a statement. The > advantage of the convenience function is not just that it is shorter, but > that it is an expression. But using that expression in any form other than NAME = Enum('NAME', ...) will again result in an unpicklable enum, which was the point of this thread.

Right, if all we want is a functional API that doesn't support pickling of the resulting class, that's trivial.

What I'm after is a convenience API that supports autonumbering, as a trivial replacement for code that currently uses "range(n)". A class statement is perfectly acceptable to me for that purpose.

Independently of that, I do like the notion of a "types.set_name(cls, dotted_name)" API that alters name and module, while leaving qualname alone.

Cheers, Nick.

Georg

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