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Showing content from https://mail.python.org/pipermail/python-dev/2002-November/029943.html below:

[Python-Dev] Metaclass insanity - another use case

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> 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')
> 
> One of the use cases I have in mind is GUI programming, where
> you frequently need to build complicated nested structures with
> lots of keyword arguments to constructors. A construct like this
> might help you to lay out the code more neatly and readably.

-1.

TOOWTDI.

--Guido van Rossum (home page: http://www.python.org/~guido/)

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