Description
Since 3.0, provides syntax for indicating keyword-only arguments (PEP 3102).
It is not a full replacement for our current usage of keyword_only, but it would allow us to make our expectations explicit:
@keyword_only def __init__(self, degree=2, inputCol=None, outputCol=None):
@keyword_only def __init__(self, *, degree=2, inputCol=None, outputCol=None):