[Python-Dev] [Python-checkins] peps: Pre-alpha draft for PEP 435 (enum). The name is not important at the moment, as (original) (raw)
Tim Delaney timothy.c.delaney at gmail.com
Tue Feb 26 00:04:40 CET 2013
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On 26 February 2013 07:32, Barry Warsaw <barry at python.org> wrote:
One thing I've been thinking about is allowing you to override the EnumValue class that the metaclass uses. In that case, if you really wanted ordered comparisons, you could override lt() and friends in a custom enum-value class. I haven't quite worked out in my mind how that would look, but I have a bug to track the feature request:
https://bugs.launchpad.net/flufl.enum/+bug/1132976 Heck, that might even allow you to implement int-derived enum values if you really wanted them .
You're starting to tread in an area that I investigated, did an implementation of, and then started moving away from due to a different approach (delegating to the methods in the owning Enum class when accessing EnumValue attribtues).
I haven't touched my implementation for a couple of weeks now - been busy with other stuff and I got a bit fatigued with the discussion so I decided to wait until things had settled a bit. Hasn't happened yet ... ;)
I'm actually in a quandry about what way I want my enums to go. I think each enum should have an ordinal based on the order it is defined, and should be ordered by that ordinal. But (whether or not it inherits from int
- I'm ignoring string enums here) should int and index return the ordinal, or the assigned int value (if it has one)? There are arguments both ways. My current implementation doesn't have an ordinal at all (except by accident in the trivial case). That was when I decided to put it aside for a while and see where the discussion went.
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