[Python-3000] sets in P3K?

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    Baptiste> Actually I think we need both {/} as the empty set and {:} as
    Baptiste> the empty dict.

    Baptiste> {} should raise SyntaxError, '{} is ambiguous, use {/} for
    Baptiste> set, {:} for dict'

Piggybacking on this post and Barry's heretical ideas, (/) looks more like
the null set to me...  Actually, if Py3k is going to be Unicode only, why
not use Ø as the null set? ;-)

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