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Thu Dec 14 19:36:11 EST 2017 · https://mail.python.org/pipermail/python-dev/2017-December/151261.html

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.
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Showing content from https://mail.python.org/pipermail/python-dev/2017-December/151261.html below:

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