[Python-ideas] constant/enum type in stdlib (original) (raw)
Michael Foord fuzzyman at gmail.com
Wed Jan 30 16:22:06 CET 2013
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On 30 January 2013 07:26, Antoine Pitrou <solipsis at pitrou.net> wrote:
On Wed, 30 Jan 2013 17:58:37 +1300 Greg Ewing <greg.ewing at canterbury.ac.nz> wrote: > Guido van Rossum wrote: > > > class color(enum): > > RED = value() > > WHITE = value() > > BLUE = value() > > We could do somewhat better than that: > > class Color(Enum): > RED, WHITE, BLUE = range(3)
With a Python 3 metaclass that provides default values for looked up entries you could have this:
class Color(Enum): RED, WHITE, BLUE
The lookup would create the member - with the appropriate value.
Michael
> > However, it's still slightly annoying that you have to > specify how many values there are in the range() call. > It would be even nicer it we could just use an infinite > iterator, such as > > class Color(Enum): > RED, WHITE, BLUE = values()
Well, how about: class Color(Enum): values = ('RED', 'WHITE', 'BLUE') ? (replace values with values if you prefer) Regards Antoine.
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