[Python-3000] sets in P3K?

[Brian Harring]

On Fri, Apr 28, 2006 at 08:09:24AM -0400, Greg Wilson wrote:
> OK, OK, just so I can get it off my chest:
> 
> - introduce '@' as a prefix operator meaning 'freeze'.
> 
> - [1, 2, 3] is a mutable sequence (our old friend the list)
> 
> - {1, 2, 3} is a mutable set
> 
> - @{1, 2, 3} is an immutable set (i.e., a frozen set --- frozen
>   at creation, so all current optimizations possible)
> 
> - @[1, 2, 3] is an immutable sequence (i.e., a tuple)
> 
> Now, if only I can figure out whether "@x" means "bind the name x
> permanently to its current value to create a symbolic constant" or "freeze
> the object to which x currently refers"... ;-)

Potentially a stupid question, but I've been following this thread for 
a while and I'm still not seeing the real gain of extending the syntax 
for frozen markers/set literals.

Someone care to recap what actually is gained from having a set 
literal?
~harring
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