[Python-Dev] constant/enum type in stdlib (original) (raw)

Nick Coghlan ncoghlan at gmail.com
Tue Nov 30 03:23:04 CET 2010

On Tue, Nov 30, 2010 at 7:36 AM, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:

I don't see how the grouping can be completely separated from the value-naming. If the named values are to be subclassed from the base values, then you want all the members of a group to belong to the same subclass. You can't get that by treating each named value on its own and then trying to group them together afterwards.

Note that my sample implementation cached the created types, so that (for example) there was only ever one "Named" type (my implementation wasn't quite kosher in that respect, since functools.lru_cache has a non-optional size limit - setting maxsize to float('inf') deals with that). A grouping API would use either single or multiple inheritance to create members that supported both the naming aspects as well as the grouping aspects.

Cheers, Nick.

-- Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia

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