[issue17373] Add inspect.Signature.from_callable()

[Yury Selivanov]

Yury Selivanov added the comment:

> The difference is that inspect.signature is not friendly to Signature
> subclasses.  Without from_callable you can't customize the behavior in
> inspect.signature easily.

OK, suppose you have "Signature.from_callable".  You then create a subclass
MySignature, and override it. How can you customize 'inspect.signature' to 
use the MySignature class?

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