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gh-56229: Document flush expectation for stdout and stderr replacements #153150

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gh-56229: Document flush expectation for stdout and stderr replacements #153150

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4 changes: 4 additions & 0 deletions Doc/library/sys.rst
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Expand Up @@ -2180,6 +2180,10 @@ always available. Unless explicitly noted otherwise, all variables are read-only
may be replaced with file-like objects like :class:`io.StringIO` which
do not support the :attr:`!buffer` attribute.

At interpreter shutdown, the ``stdout`` and ``stderr`` streams are
flushed, so objects used to replace them should provide a ``flush()``
method.


.. data:: __stdin__
__stdout__
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