[issue20334] make inspect Signature hashable

[Antony Lee]

Antony Lee added the comment:

While your patch works, I think it is a good opportunity to simplify the implementation of Signature.__eq__, which is *much* more complicated than what it should be.
Please comment on the attached patch, which uses the helper method approach I suggested.

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Added file: http://bugs.python.org/file36610/signature-hash-and-equality.patch

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<http://bugs.python.org/issue20334>
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