[issue17481] inspect.getfullargspec should use __signature__

[Larry Hastings]

Larry Hastings added the comment:

My solution for pydoc was to call isroutine() instead of isfunction(), and yes handle it throwing an exception.

(I just checked, and I wasn't catching TypeError, only ValueError.  I'll fix that in my next patch for #20189.)

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<http://bugs.python.org/issue17481>
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