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

Michael Foord fuzzyman at voidspace.org.uk
Wed Nov 24 01:41:37 CET 2010

On 23/11/2010 21:15, Antoine Pitrou wrote:

Le mardi 23 novembre 2010 à 16:10 -0500, Glyph Lefkowitz a écrit :

On Nov 23, 2010, at 10:01 AM, Antoine Pitrou wrote:

Well, it is easy to assign range(N) to a tuple of names when desired. I don't think an automatically-enumerating constant generator is needed. I don't think that numerical enumerations are the only kind of constants we're talking about. Others have already mentioned strings. Also, see<http://tm.tl/4671> for some other use-cases. Since this isn't coming to 2.x, we're probably going to do our own thing anyway (unless it turns out that flufl.enum is so great that we want to add another dependency...) but I'm hoping that the outcome of this discussion will point to something we can be compatible with. I think that asking for too many features would get in the way, and also make the API quite un-Pythonic. If you want your values to be e.g. OR'able, just choose your values wisely ;)

Well, the point of an OR'able flag is that the result shows the OR'd values in the repr. Raymond suggests using a set of strings where you need flag constants. For new apis (so no backwards compatibility constraints) where you don't need to use integers (i.e. not wrapping a C library) that's a great suggestion:

 flags = {'FOO', 'BAR'}

Michael

Regards

Antoine.

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