After thinking about this a bit more, my suggestion is not to fix it.  Instead, I suggest that PEP 8 be modified to suggest that all positional arguments and iterable argument unpackings precede keyword arguments and keyword argument unpackings.  Then, a tool like autopep8 is free to reorganize argument lists.  Such reorganization will not be possible if f(*a(), b=b()) is different than f(b=b(), *a()).