[issue7092] Test suite emits many DeprecationWarnings when -3 is enabled

[Florent Xicluna]

Florent Xicluna <laxyf at yahoo.fr> added the comment:

+1 to remove this boring cPickle message.

cStringIO do not print such messages.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7092>
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