Comparisons and sorting of a numeric class....
Ian Kelly
ian.g.kelly at gmail.com
Fri Jan 23 13:04:18 EST 2015
On Fri, Jan 23, 2015 at 10:03 AM, Rustom Mody <rustompmody at gmail.com> wrote:
> On Friday, January 23, 2015 at 10:22:06 PM UTC+5:30, Ian wrote:
>> On Fri, Jan 23, 2015 at 8:31 AM, Rustom Mody wrote:
>> > Can you tell me what of the following code does not satisfy your requirements?
>> > [Needs python 3.4]
>> >
>> >
>> >>>> from enum import IntEnum
>> >>>> class B4(IntEnum):
>> > F1 = 0
>> > F2 = 0
>> > F3 = 0
>> > T = 1
>>
>> This strikes me as a potential problem:
>>
>> >>> B4.F1 is B4.F2 is B4.F3
>> True
>> >>> list(B4)
>> [<B4.F1: 0>, <B4.T: 1>]
>>
>> Enum members with the same values are just aliases for one another,
>> not distinct entities.
>
> Yeah....
>
> The only workaround I have been able to come up with is:
>
> class B4(IntEnum):
>> F1 = 0
>> F2 = ""
>> F3 = None
>> T = 1
>
> which is not bad; its ridiculous
> [Like going around with a broken broom searching for falsey objects :-) ]
How about something like this:
>>> from enum import Enum
>>> class B4(Enum):
... F1 = (False, 1)
... F2 = (False, 2)
... F3 = (False, 3)
... T = (True, 4)
... def __bool__(self):
... return self.value[0]
...
>>> B4.F1 is B4.F2
False
>>> bool(B4.F1)
False
>>> bool(B4.T)
True
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