[Python-Dev] PEP 435 - ref impl disc 2 (original) (raw)

Ethan Furman ethan at stoneleaf.us
Sun May 5 09:21:22 CEST 2013

On 05/04/2013 11:31 PM, Glenn Linderman wrote:

x = NamedInt('the-x', 1 ) y = NamedInt('the-y', 2 ) # demonstrate that NamedInt propagates the names into an expression syntax print( repr( x ), repr( y ), repr( x+y )) from ref435 import Enum # requires redundant names, but loses names in the expression class NEI( NamedInt, Enum ): x = NamedInt('the-x', 1 ) y = NamedInt('the-y', 2 ) print( repr( NEI( 1 )), repr( NEI( 2 )), repr( NEI(1) + NEI(2)))

Well, my first question would be why are you using named anything in an enumeration, where it's going to get another name?

But setting that aside, if you

--> print(NEI.x.name) 'x'

not 'the-x'.

Now let's look for the clues:

class Enum... ... @StealthProperty def name(self): return self._name

class NamedInt... ... def name(self): return self._name # look familiar?

When NamedInt goes looking for _name, it finds the one on x, not the one on x.value.

-- Ethan

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