Michael Foord <mich...@voidspace.org.uk> added the comment:

Although merely switching to StringIO may not be enough. TestResult objects 
keep a reference to sys.stdout when they are instantiated and you can't pickle 
that either.

It is preferable for the reference to be taken at instantiation time rather 
than stored as a module level reference to be compatible with test runners 
(like regrtest) that *themselves* replace sys.stdout...

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue8333>
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