Help needed in understanding: make-pytype in ffi-callbacks.lisp

[digikar99]

I tried

(python:startup-python)
(python:import "numpy")

but ended with function %TYPE.MRO is undefined, and the only place I see its mention (using simple grep) is in ffi-callbacks.lisp and ffi-interface.lisp. I presume that the former mention is for defining it. But I see no call to make-pytype either.

Could someone elaborate make-pytype?

Thanks!

PS: I'm aware of numcl, but just wanted to understand bb3 better.