[issue36042] Setting __init_subclass__ and __class_getitem__ methods are in runtime doesnt make them class method.

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> CPython only makes these methods class method when a class created.
> If you set __class_getitem__ method after the creation it 
> doesn't work unless you use classmethod decorator manually.

Give the intended use case for __class_getitem__ and that it was replacement for metaclass code with the same effect, the current behavior doesn't seem unreasonable.  That said, I don't see any downside to allowing the method to attach after class creation.

Assigning to Ivan to make the call on this one.

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assignee:  -> levkivskyi
components: +Interpreter Core
nosy: +rhettinger
type: behavior -> enhancement
versions: +Python 3.8

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<https://bugs.python.org/issue36042>
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