[issue32226] Implement PEP 560: Core support for typing module and generic types

[Ivan Levkivskyi]

Ivan Levkivskyi <levkivskyi at gmail.com> added the comment:

Serhiy,

I am sorry for a delay, I have recently moved to another country, this is why I have not much time. I will try to work on this weekend. Here are some points where you can be helpful:

* Make a short documentation PR for `__mro_entry__` and `__base_subclass__` methods.
* Document the `__class_getitem__` C API calling convention (with motivation, many classes are implemented in C but are generic in nature, like numpy.ndarray) in PEP 560.

(I know this might be not very interesting, but this will save time for me to focus only on typing part.)

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<https://bugs.python.org/issue32226>
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