[Python-Dev] Make __class_getitem__ a class method

[Ivan Levkivskyi]

On 15 December 2017 at 17:47, Yury Selivanov <yselivanov.ml at gmail.com>
wrote:

> Shouldn't we optimize the usability for pure-Python first, and then for C
> API?
>
> Right now we have the '__new__' magic method, which isn't a
> @classmethod.  Making '__class_getitem__' a @classmethod will confuse
> regular Python users.  For example:
>
>    class Foo:
>       def __new__(cls, ...): pass
>
>       @classmethod
>       def __class_getitem__(cls, item): pass
>
> To me it makes sense that type methods that are supposed to be called
> on type by the Python interpreter don't need the classmethod
> decorator.
>

Good point! Pure Python will be the primary use case and we have another
precedent
for "automatic" class method: __init_subclass__ (it does not need to be
decorated).


> METH_STATIC is a public working API, and in my opinion it's totally
> fine if we use it. It's not even hard to use it, it's just *mildly*
> inconvenient at most.
>

OK, then documenting this "recipe" (METH_STATIC plus tuple unpacking)
should be sufficient.

--
Ivan
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