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

[Stefan Behnel]

Stefan Behnel added the comment:

> Since this is a problem in Cython, not in CPython, maybe you can fix it in Cython?

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.

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