[Python-3000] sets in P3K?

[Josiah Carlson]

"Jim Jewett" <jimjjewett at gmail.com> wrote:
> 
> On 5/2/06, Raymond Hettinger <rhettinger at ewtllc.com> wrote:
> 
> > I think Guido had the best solution.  Use set() for empty sets, use {}
> > for empty dicts, use {genexp} for set comprehensions/displays, use
> > {1,2,3} for explicit set literals, and use {k1:v1, k2:v2} for dict
> > literals.  We can always add {/} later if demand exceeds distaste.
> 
> I understand {1,2,3} vs {k1:v1, k2:v2}, but what is the {genexp} for?
> 
> As I read that, if the generator yielded two-tuples, you would get a
> set of two-tuples rather than a dict.  There would be no comprehension
> syntax for dicts.
> 
> I'm not sure we need a comprehension syntax for dicts, but I'm not
> sure we need one for sets either.
> 
>     >>> set(gen())
> 
> doesn't seem any worse than
> 
>     >>> dict(gen())

Agreed.

 - Josiah