[Python-ideas] constant/enum type in stdlib

[Barry Warsaw]

On Jan 31, 2013, at 09:19 AM, Cameron Simpson wrote:

>  Color = enum(RED=None, WHITE=None, BLUE=None, yellow=9)

Oh, I forgot to mention that flufl.enum has an alternative API that's fairly
close to this, although it does not completely eliminate DRY[1]:

>>> from flufl.enum import make
>>> make('Animals', ('ant', 'bee', 'cat', 'dog'))
<Animals {ant: 1, bee: 2, cat: 3, dog: 4}>

You can also supply the elements as a 2-tuples if you want to specify the
values.  An example from the docs providing bit flags:

>>> def enumiter():
...     start = 1
...     while True:
...         yield start
...         start <<= 1
>>> make('Flags', zip(list('abcdefg'), enumiter()))
<Flags {a: 1, b: 2, c: 4, d: 8, e: 16, f: 32, g: 64}>

Cheers,
-Barry

[1] The first argument is currently necessary in order to give the right
printed representation of the enum.
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