[Python-3000] set literals

[CM]

On 7/17/06, Guido van Rossum <guido at python.org> wrote:
>
> Hm. Your objections seem to be purely from a performance tuning POV. I
> think that if we agree that API-wise this is an improvement (fewer
> things to learn, set literals problem solved, and dicts grow some
> useful new methods) we should make a decision to do it and damn the
> tuning (I trust Raymond will find a way :-).


+1

Raymond always finds a way.

- C

--Guido
>
> On 7/17/06, Michael Chermside <mcherm at mcherm.com> wrote:
> > Guido writes:
> > > I've also sometimes thought of unifying dicts and sets by implementing
> > > set operations on the keys of dicts only.
> >     [... much discussion ...]
> > > I'm still very much undecided but I don't want to rule this out for
> > > py3k. Perhaps I'll write up a PEP and see how it flies.
> >
> > Playing with it, and PEPing it both sound fine, but I think DOING it
> > seems like a bad idea.
> >
> > I see two advantages. One is public: it solves the issue of a set
> > literal. The other is private: it allows us to reuse the implementation.
> >
> > Fixing the set literal just isn't sufficient justification, IMHO. And
> > as for the implementation, we care VERY much about perfectly tuning
> > the performance of the dict type, because its performance is so key to
> > the implementation of namespaces throughout Python. So I would not want
> > to accept any unnecessary restrictions on the implementation that might
> > constrain future optimizations of dict performance.
> >
> > Besides, how difficult is it to maintain the existing C implementation
> > of set and frozenset (now that they're written and have been through
> > the wringer of being in a production release). It's not zero cost, but
> > it's also probably not THAT big.
> >
> > Of course, that's the idea behind trying it out and even writing a PEP
> > -- then we'll see whether my guess (or yours!) is correct.
> >
> > -- Michael Chermside
> >
>
>
> --
> --Guido van Rossum (home page: http://www.python.org/~guido/)
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-- 
C
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