On Friday, January 23, 2015 at 11:35:49 PM UTC+5:30, Ian wrote:
> On Fri, Jan 23, 2015 at 10:03 AM, Rustom Mody 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
Simpler (though less general)
class B4(Enum):
F1 = 1
F2 = 2
F3 = 3
T = 4
def __bool__(self): return self.value == 4
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