[issue8333] test_multiprocessing: pickling failures

[Michael Foord]

Michael Foord <michael at 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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