[issue24018] add a Generator ABC

[Stefan Behnel]

Stefan Behnel added the comment:

FYI, here's the patch implementation for Cython:

https://github.com/cython/cython/blob/cf63ff71c06b16c3a30facdc7859743f4cd495f6/Cython/Utility/Generator.c#L849

The only difference is that it takes care of changing "__next__" to "next" in Py2.x.

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