Thanks for your comments Serhiy. I update the patch according to your comments.

Actually I don't think this is a new feature. Maybe staticmethod and classmethod are just forgotten.

As for separate tests for staticmethod and classmethod, I think they are not needed for this patch since right now we can use dis.dis to disassemble them explicitly. Only when dis.dis a class they are missing. But since there are no tests for them, adding tests for them is good.