New submission from dmontague <davwm...@gmail.com>:
I am trying to obtain the output of `inspect.signature`, except with string-valued annotations converted to resolved type hints, similarly to `typing.get_type_hints`. Is there a good way to do this currently? If not, might this be a good fit for the standard library? --------------- The straightforward way I see to attempt this would be to call both `typing.get_type_hints` and `inspect.signature` on the callable, and then "merge" the results. However, as far as I can tell, that only works if the provided callable is a function or method (i.e., not a type or a callable class instance). As an example, if I have an instance of a class with a `__call__` method, and the class was defined in a module with `from __future__ import annotations`, then calling `inspect.signature` on the instances will only return an `inspect.Signature` with type-unaware strings as the annotations for each `inspect.Parameter`. On the other hand, calling `get_type_hints` on the instance will return type hints for the class, rather than for its `__call__` method. I wouldn't mind manually handling an edge case or two, but the logic used by `inspect.signature` to determine which function will be called seems relatively involved, and so I would ideally like to leverage this same logic while obtaining the type-resolved version signature for the callable. ---------- messages: 350248 nosy: dmontague, levkivskyi priority: normal severity: normal status: open title: Combining typing.get_type_hints and inspect.signature type: enhancement versions: Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue37923> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
