hai shi <shihai1...@126.com> added the comment:

>Not a function, shouldn't be used with PyType_Slot:
>  * tp_dict - I'd add a PyType_GetDict if there is a need to get this
>  * tp_mro - I'd add a PyType_GetMRO if there is a need to get this

I checked some other projects which use type fileds directly.
cpython doesn't expose the tp_dict and tp_mro directly in headers. 
I am not sure which way is more better(calling function vs using fileld 
directly).

refs:
https://gitlab.gnome.org/GNOME/pygobject/-/blob/master/gi/gimodule.c#L1168
https://github.com/biolab/orange2/blob/db40a9449cb45b507d63dcd5739b223f9cffb8e6/source/orange/cls_orange.cpp#L587

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