Daniel Urban added the comment:
If I understand correctly, the invariant is that len(kw_defaults) ==
len(kwonlyargs). I think the reason is that the following is valid syntax (an
argument without a default after one with a default):
>>> def f(*, a=0, b): pass
...
>>>
And None is used as a placeholder in the kw_defaults list:
>>> ast.dump(ast.parse('def f(*, a=0, b): pass'))
"Module(body=[FunctionDef(name='f', args=arguments(args=[], vararg=None,
varargannotation=None, kwonlyargs=[arg(arg='a', annotation=None), arg(arg='b',
annotation=None)], kwarg=None, kwargannotation=None, defaults=[],
kw_defaults=[Num(n=0), None]), body=[Pass()], decorator_list=[],
returns=None)])"
>>>
So it seems to me, that this behavior is intentional. (Also, it works no
differently in 3.2.)
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<http://bugs.python.org/issue16545>
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