[issue22389] Generalize contextlib.redirect_stdout

[Yury Selivanov]

Yury Selivanov added the comment:

@Berker Peksag: The patch looks fine, although I would rename 'redirect_stream' -> '_redirect_stream' or '_RedirectStream'

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nosy: +yselivanov

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22389>
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