[issue22389] Generalize contextlib.redirect_stdout

[John Isidore]

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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