[docs] [issue30390] Document how to make classes in the C API.

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This is documented. See https://docs.python.org/3/extending/newtypes.html.

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nosy: +serhiy.storchaka
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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<http://bugs.python.org/issue30390>
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