Performance of int/long in Python 3

[Serhiy Storchaka]

On 07.04.13 00:24, Chris Angelico wrote:
> On Sat, Apr 6, 2013 at 8:09 PM, Serhiy Storchaka <storchaka at gmail.com> wrote:
>> See also the discussion at
>> http://comments.gmane.org/gmane.comp.python.ideas/15640 . I agree with
>> rejection. This is an implementation detail and different Python
>> implementations (including future CPython versions) can have different
>> internal string implementations.
>
> I really don't see why this means that there can't be a function in
> sys, or something. I mean, other Pythons aren't expected to return the
> exact same values from sys.getsizeof, are they? But clearly the weight
> of opinion is against me, so fine, I don't care that much.

The most strong argument for adding this feature in stdlib is that it 
has O(1) complexity against of O(N) complexity of any manual 
implementation. But this argument is not valid for other implementations.