[issue17159] Remove explicit type check from inspect.Signature.from_function()

[Yury Selivanov]

Yury Selivanov added the comment:

> So, once again:

> If the intention is to test that a callable has a "__text_signature__", 
> then the code should test for the existance of "__text_signature__". 
> It should *not* try to test for types that may or may not have such 
> an attribute, and then just fail if it surprisingly does not find it.

Unfortunately this is something I do *not* want to change.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17159>
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