[Python-ideas] Add an attribute spec descriptor.

[Nick Coghlan]

In selling this idea, I would focus on the immediate impact it could have
on "help(cls)", as well as the automated testing possibilities (checking
all attributes are set on an instance).

There's also the class-only descriptor behaviour we added for enums to
consider, where retrieval via an instance throws AttributeError.

Essentially - interesting idea, but one you can experiment with outside the
stdlib :)

Cheers,
Nick.
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