[Python-3000] Metaclass syntax?

[Bill Birch]

This has probably been proposed before, here goes anyhow. 

instead of:

   class TheLarch(deciduous)
       __metaclass__ = KindsOfTrees

could we have this syntax:

   class[KindsOfTrees]  TheLarch(deciduous):
	   pass

more real examples:

   class[interface] iterable: pass

   class[Persistent] Customer: pass

er, that's it.

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