[Python-3000] ABC PEP -- dropping set.clear
Guido van Rossum
guido at python.org
Thu Apr 26 02:39:38 CEST 2007
On 4/25/07, Jim Jewett <jimjjewett at gmail.com> wrote:
> On 4/25/07, guido.van.rossum <python-checkins at python.org> wrote:
> > + implementation.) **Open issues:** Forcing every mutable set
> > + to implement this may be a pain for such a fairly
> > + non-essential method. Perhaps just drop it?
> There are also comments worrying that an abstract implementation would
> be horribly slow -- but so what?
True. In the discussion of __hash__ returning 0 by default I even
mention that I'd rather be slow and correct than fast and wrong. :-)
> Alex Martelli posted some stats (for dicts, I think) showing that
> (even today) clear was slower than just creating a new object.
> It still makes sense if you care about the "is" relation
> Since you are keeping "pop", the abstract implementation can at least
> approximate iteration.
> def clear(self):
> while self.pop(): pass
That would have to be
But yeah, I'll do this. Thanks for the reality check!
--Guido van Rossum (home page: http://www.python.org/~guido/)
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