On 5/5/2013 6:07 AM, Ethan Furman wrote:
class NEI( NamedInt, Enum ):
x = NamedInt('the-x', 1 )
y = NamedInt('the-y', 2 )
@property
def __name__(self):
return self.value.__name__
This cured it, thank you. But I really still don't understand why the
numbers showed up as names... seems to me that either the name of the
enumeration member, or the name of the NamedInt should have showed up,
without this property definition.
The PEP is the only documentation I had, other than the reference
implementation, but I can't say I fully understand the reference
implementation, not having dealt with metaclass much. Hopefully the
documentation will explain all the incantations necessary to make things
work in an expected manner. I guess I don't understand why Enum can't
wrap the __str__ and __repr__ of the type of the mixed class, instead of
replacing it, and then forcing overrides in subclasses.
But empirically, it didn't seem to be __str__ and __repr__ that caused
the visible problem, it was __name__. So you asked why would I want to
put a named object as the value of something else with a name... and
that is a fair question... really I don't... but I see one of the
beneficial uses of Enum being collecting flags values together, and
constructing a flag that is useful for debugging (has a name or
expression telling what the values are). So while the PEP thinks
IntEnum is an odd case, I think it is important. And since IntEnum loses
its name when included in an expression, I was trying to marry it to
NamedInt to fill the gap.
So you asked why would I want to put a named object as the value of
something else with a name... maybe Enum should make provision for
that... if the primary type ( Int for IntEnum, NamedInt for
NamedIntEnum) happens to have a __name__ property, maybe the name of
enumeration members should be passed to the constructor for the
members... in other words,
class NIE( NamedInt, Enum ):
x = 1
y = 2
could construct enumeration members x and y whose values are
NamedInt('x', 1) and
NamedInt('y', 2)...
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