[Python-Dev] Metaclass insanity - another use case

[Aahz]

On Wed, Nov 06, 2002, Greg Ewing wrote:
> "Phillip J. Eby" <pje@telecommunity.com>:
>> 
>> As for *why* I had inner classes, the following might be a good example:
>>
>>      class ModelElement(Element):
>> 
>>          class isSpecification(model.Field):
>>              isRequired = 1
>>              qualifiedName = 'Foundation.Core.ModelElement.isSpecification'
>>              _XMINames = ('Foundation.Core.ModelElement.isSpecification',)
>>              name = 'isSpecification'
>>              referencedType = 'Boolean'
> 
> I'm not sure if it would be quite what Phillip needs, but
> I've been wondering recently whether Python could benefit
> from having an "instance" statement which does for instances
> what the "class" statement does for classes.
> 
> The idea is you'd be able to say something like
> 
>    instance isSpecification(model.Field):
>       isRequired = 1
>       qualifiedName = 'Foundation.Core.ModelElement.isSpecification'
> 
> and it would be equivalent to
> 
>    isSpecification = model.Field(isRequired = 1,
>       qualifiedName = 'Foundation.Core.ModelElement.isSpecification')

Yeah, but that doesn't gain you all that much over

    isSpecification = model.Field(
        isRequired = 1,
        qualifiedName = 'Foundation.Core.ModelElement.isSpecification'
        )
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