[issue37497] Add inspect.Signature.from_text().

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

I'd be fine with `Signature.from_text()`, but not with `Signature` constructor / `signature()` function accepting both callable and string arguments. Overall, I think that we ought to have a real need to add this new API, so unless there's a good (or any, really) use case I'd say we shouldn't merge this now.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37497>
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