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

[Yury Selivanov]

Yury Selivanov added the comment:

> I'm actually considering that. Now that Signature.from_function() allows
> function-like types, it appears like it's the easiest solution to add a
> "__signature__" property to cyfunctions that does the necessary "from
> inspect import Signature, return Signature.from_function(self)" dance.

Oh, sound like a big hack.

Stefan, Larry,

Please take a look at the new patch 'sig_cython_latest'

The change is really minimal, I think we can still push this in 3.4.

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Added file: http://bugs.python.org/file34072/sig_cython_latest_01.patch

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