[issue17481] inspect.getfullargspec should use __signature__

[Yury Selivanov]

Yury Selivanov added the comment:

> There's a major difference between getfullargspec/getargspec and inspect.signature: getfullargspec shows you the "self" parameter for bound methods, and inspect.signature does not.

Larry, yes, that's correct. The attached patch simulates this behaviour, with:

    if ismethod(func):
        func = func.__func__

I'm attaching 'getargsspec_03.patch', as the previous one (02) was a bit crippled.

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Added file: http://bugs.python.org/file33755/getargsspec_03.patch

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