As Steve mentioned in the discussion aboutPEP 570 [1], some changes of parameters to positional-only are breaking (although there is no breaks in the stdlib code). Before making parameters positional-only we should add a deprecation warning for passing them as keyword arguments. Similarly to the code used in the UserDict constructor (seeissue22609).The following PR adds deprecation warnings for other parameters which should be positional-only. It also fixes bugs about nonavailability to pass special keyword names like "self" or "func". Just one example:>>> import functools>>> def f(self, func): pass... >>> functools.partialmethod(f, func=chr)Traceback (most recent call last):  File "<stdin>", line 1, in <module>TypeError: __init__() got multiple values for argument 'func'[1]https://discuss.python.org/t/pep-570-python-positional-only-parameters/1078/53