Type hints: basic usage to infer argument types (fixes #203) #211
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Also drop argh.utils.get_arg_spec(). It is no longer needed because while getfullargspec() did not handle decorated functions properly, signature() does. A backwards incompatible change (an extremely rare edge case) is documented in the changelog.
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MVP:
str,int,float(and their deprecated aliases:Str, etc. until we drop support for Python 3.8 around Q4 2024)Nice to have:
nargs=ZERO_OR_MORE:list[str]→nargs=ZERO_OR_MORE, type=strlist[str] | None,list[str | None]andlist[str | None] | None— there's no difference for us in the context of mapping).nargs=Nfoo: Tuple[str, int, float]->add_argument('foo', nargs=3)followed by (e.g.)
args = parser.parse_args(); args.foo[1] = int(args.foo[1]); args.foo[2] = float(args.foo[2])(Type hinting ("typing" module) #107 (comment))foo: Literal['one', 'two', 'three']->add_argument('foo', choices=['one', 'two', 'three']possibly with completion (later). (Type hinting ("typing" module) #107 (comment))
add_argument()params via hints instead of@arg:Annotated[x, ExtraParams(type=some_callable, help="something", nargs="+")]