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[Python-Dev] Accepting PEP 560 -- Core support for typing module and generic types

Guido van Rossum guido at python.org
Thu Dec 14 21:00:30 EST 2017

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In the light of Antoine's and Stephan's feedback I think this can be
reconsidered -- while I want to take a cautious stance about resource
consumption I don't want to stand in the way of progress.

On Thu, Dec 14, 2017 at 4:36 PM, Stephan Hoyer <shoyer at gmail.com> wrote:

> On Thu, Dec 14, 2017 at 4:29 PM Yury Selivanov <yselivanov.ml at gmail.com>
> wrote:
>
>> On Thu, Dec 14, 2017 at 7:03 PM, Guido van Rossum <guido at python.org>
>> wrote:
>> My motivation to add the slot wasn't the performance: it's just not
>> possible to have a class-level __getitem__ on types defined in C. The
>> only way is to define a base class in C and then extend it in
>> pure-Python.  This isn't too hard usually, though.
>
>
> This could potentially make it much more complicated to adding typing
> support to NumPy. numpy.ndarray is defined in C.
>
>


-- 
--Guido van Rossum (python.org/~guido)
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