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As Steve mentioned in the discussion about PEP-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 (see bpo-22609).
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
>>> deff(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'
New changeset a37f356 by Serhiy Storchaka in branch '3.7':
[3.7] bpo-36492: Fix passing special keyword arguments to some functions. (GH-12637) (GH-12645) a37f356
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