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Fri Sep 1 16:19:39 EDT 2017 · http://mail.python.org/pipermail/python-dev/2017-September/149128.html

2017-09-01 13:05 GMT-07:00 Chris Barker <chris.barker at noaa.gov>:

> On Thu, Aug 31, 2017 at 5:12 PM, Antoine Pitrou <solipsis at pitrou.net>
> wrote:
>
>> I'm skeptical there are some programs out there that are limited by the
>> speed of PyLong inplace additions.
>>
>
> indeed, but that could be said about any number of operations.
>
> My question is -- how can the interpreter know if it can alter what is
> supposed to be an immutable in-place? If it's used only internally to a
> function, the it would be safe, but how to know that?
>
I believe Catalin's implementation checks if the object's refcount is 1. If
that is the case, it is safe to mutate it.

>
> -CHB
>
>
>
> --
>
> Christopher Barker, Ph.D.
> Oceanographer
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> Chris.Barker at noaa.gov
>
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[Python-Dev] Inplace operations for PyLong objects