John Isidore added the comment:

There is stdout_redirected() function [1] that allows to redirect a file object 
given as `stdout` patameter including `sys.stderr`. It works at a file 
descriptor level i.e. it supports redirecting subprocess' output too but it 
doesn't work for StringIO (no fd).

[1] 
http://stackoverflow.com/questions/4675728/redirect-stdout-to-a-file-in-python/22434262#22434262

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nosy: +John Isidore

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<http://bugs.python.org/issue22389>
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