[issue17481] inspect.getfullargspec should use __signature__

[Yury Selivanov]

Yury Selivanov added the comment:

> Instead of keeping the check, we could just unconditionally convert exceptions from the signature call to a TypeError in order to maintain compatibility with the old external behaviour.

Agreed. See the new patch (getargsspec_02.patch)

Unfortunately, we have to keep the old 'ismethod' check in place for backwards compatibility purposes.

Larry,

The attached patch contains one failing unit-test: 'inspect.signature' returns 'None' for '_testapi.docstring_no_signature'. It should instead raise a ValueError.

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Added file: http://bugs.python.org/file33565/getargsspec_02.patch

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