[issue3658] fix for pychecker property complaints

[Skip Montanaro]

Skip Montanaro <skip at pobox.com> added the comment:

I can see where that might be a problem.  If that's the case I suspect 
those property attributes should be changed.  OTOH, do properties work on 
classic classes?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3658>
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