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

Aahz aahz at pythoncraft.com
Wed Aug 30 04:16:25 CEST 2006

On Tue, Aug 29, 2006, Guido van Rossum wrote:
> 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. 

That's true only for newer code that correctly uses sets instead of
dicts -- but we've had this argument before.
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are, by
definition, not smart enough to debug it."  --Brian W. Kernighan

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