[issue3658] fix for pychecker property complaints

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

If it's only to please pychecker, then I don't think we should make this
change. It's potential gratuitous breakage, especially if people
subclass those classes.

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nosy: +pitrou

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