builtin set literal

[Steven Bethard]

Schüle Daniel wrote:
>> {:} for empty dict and {} for empty set don't look too much atrocious
>> to me.
> 
> this looks consistent to me

Yes, a lot of people liked this approach, but it was rejected due to 
gratuitous breakage. While Python 3.0 is not afraid to break backwards 
compatibility, it tries to do so only when there's a very substantial 
advantage. I guess enough people felt that having a shortcut for set() 
was less important than keeping the current spelling of dict() the same.

STeVe