[Python-3000] Making more effective use of slice objects in Py3k

[Guido van Rossum]

On 8/29/06, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
> Guido van Rossum wrote:
>
> > Having views in a library module alleviates many of my objections.
> > While I still worry that it will be overused, deque doesn't seem to be
> > overused, so perhaps I should relax.
>
> Another thought is that there will already be ways
> in which Py3k views could lead to inefficiencies if
> they're not used carefully. A keys() view of a dict,
> for example, will keep the values of the dict alive
> as well as the keys, unlike the existing keys()
> method.

Right; but I don't expect that such a keys() view will typically have
a lifetime longer than the dict. For substrings OTOH that's quite
common (parsing etc.).

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)