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This issue was discussed two years ago in this thread:
http://mail.python.org/pipermail/python-list/2006-December/588224.html
Most of the messages under that subject are noise about politeness or
lack thereof (including a post by the submitter of this issue trying to
get people to be reasonable!), but an actual patch was posted as well:
http://mail.python.org/pipermail/python-list/2006-December/588377.html
The patch addresses only one object type, but does demonstrate a pattern
that might be usable in general. A concern was raised about the
generality of the function proposed, as well as the performance
implications of calling it.
I have not tried to apply the patch to the current trunk, but from a
quick look it doesn't seem like the source has changed much. Since the
problem turns out to be a lot less trivial than it seems like it should
be, the patch is a good reference in any case.