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The codeobject has a kwonlyargcount meaning the number of
keyword only arguments. Thus, the api for creating new code
object is changed: PyCode_New now takes kwonlyargcount.

So, the signature changes from this
PyCode_New(argcount, nlocals, stacksize, ...)

to following.
PyCode_New(argcount, kwonlyargcount, nlocals, stacksize, ...)

From python, you can access this with name
"co_kwonlyargcount" such as, co.co_kwonlyargcount just like
you access argcount with co.co_argcount.