[Python-ideas] Issues with inspect.Parameter

[Antony Lee]

The docstring of inspect.Parameter indicates the "default" and "annotation"
attributes are not set if the parameter does not have, respectively, a
default value and an annotation, and that the "kind" attribute is a string.
But in fact, the "default" and "annotation" attributes are set to
"inspect._empty (== Parameter.empty)" in that case, and the "kind"
attribute has type "_ParameterKind" (essentially a hand-written equivalent
of IntEnum).  I suggest to correct the docstring accordingly, and to
replace the implementation of _ParameterKind by a proper IntEnum (if full
backwards compatibility is required), or even just by Enum (which makes a
bit more sense, as the fact that _ParameterKind is a subclass of int
doesn't seem to be documented anywhere).
Antony
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