[Python-3000] Empty set and empty dictionary

[Chris Rebert]

I think someone has probably proposed this before, but why not use "{,}" 
as the empty set literal? It's somewhat analogous to the 1-element tuple 
syntax and fairly similar to the syntax that the original set PEP 
proposed ("{-}"). From what I understand, {-} was nixed for being too 
hard to parse because the minus sign could be the start of an 
expression. I don't think this would apply to the comma as it's 
basically used as an expression separator; however I'm no expert on 
Python's grammar and parser, so I can't be sure.

Thoughts?

- Chris Rebert

Eoghan Murray wrote:
> I had another idea on this theme.. going by unicode and raw string 
> literals,
> how about
> s[1, 2, 3, 4]
> for a set?
> 
> Eoghan
> 
> On 17/04/07, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
>>
>> DillonCo wrote:
>>
>> > Why not use "<>" for sets?
>>
>> Some possible reasons:
>>
>> * It would look ugly
>>
>> * There could be visual confusion with comparison operators
>>
>> * There could be parsing difficulties distinguishing
>>    nested set bracketing from << and >> operators
>>
>> -- 
>> Greg
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> 
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