Python C API: how to mark a type as subclass of another type

Marco Sulla elbarbun at
Sun Oct 31 18:59:49 EDT 2021

I have two types declared as

PyTypeObject PyX_Type = {
    PyVarObject_HEAD_INIT(&PyType_Type, 0)


How can I mark one of the types as subclass of the other one? I tried
to use tp_base but it didn't work.

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