On 30 January 2013 16:26, Antoine Pitrou <solipsis@pitrou.net> wrote:
Le Wed, 30 Jan 2013 15:22:06 +0000, Michael Foord <fuzzyman@gmail.com> a écrit :
On 30 January 2013 07:26, Antoine Pitrou <solipsis@pitrou.net> wrote:
On Wed, 30 Jan 2013 17:58:37 +1300 Greg Ewing <greg.ewing@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
This relies on tuple evaluation order,
It does if you do them as a tuple.
and would also evaluate any other symbol looked up from inside the class body
Only if they aren't actually defined.
(which means I cannot add anything else than enum symbols to the class).
So not true - it is only *undefined* symbols that are added as enum values.
In other words, I'm afraid it would be somewhat fragile ;)
Well, within specific parameters... Michael
Regards
Antoine.
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