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Mon Nov 19 05:59:21 EST 2018 · https://mail.python.org/pipermail/python-dev/2018-November/155774.html

On 19.11.2018 11:53, Antoine Pitrou wrote:
> On Mon, 19 Nov 2018 11:28:46 +0100
> Victor Stinner <vstinner at redhat.com> wrote:
>> Python internals rely on internals to implement further optimizations,
>> than modifying an "immutable" tuple, bytes or str object, because you
>> can do that at the C level. But I'm not sure that I would like 3rd
>> party extensions to rely on such things.
> 
> I'm not even talking about *modifying* tuples or str objects, I'm
> talking about *accessing* their value without going through an abstract
> API that does slot lookups, indirect function calls and object unboxing.
> 
> For example, people may need a fast way to access the UTF-8
> representation of a unicode object.  Without making indirect function
> calls, and ideally without making a copy of the data either.  How do
> you do that using the generic C API?

Something else you need to consider is creating instances of
types, e.g. a tuple. In C you will have to be able to put
values into the data structure before it is passed outside
the function in order to build the tuple.

If you remove this possibility to have to copy data all the
time, losing the advantages of having a rich C API.
 --
Marc-Andre Lemburg
eGenix.com

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Showing content from https://mail.python.org/pipermail/python-dev/2018-November/155774.html below:

[Python-Dev] Experiment an opt-in new C API for Python? (leave current API unchanged)