[issue17373] Add inspect.Signature.from_callable()

[Yury Selivanov]

Yury Selivanov added the comment:

OK, got it now.

Green light from me. Looking through the code, I saw that 'from_builtin' doesn't use the 'Signature._parameter_cls' (as in from_function). That's probably needs to be fixed as well, maybe in a separate issue.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17373>
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