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Commitcdc01ea

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gh-87597: Document TimeoutExpired.stdout & .stderr types (GH-97685)
This documents the behavior that has always been the case since timeoutsupport was introduced in Python 3.3.(cherry picked from commitb05dd79)Co-authored-by: Gregory P. Smith <greg@krypto.org>
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‎Doc/library/subprocess.rst

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@@ -193,7 +193,10 @@ underlying :class:`Popen` interface can be used directly.
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..attribute::output
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Output of the child process if it was captured by:func:`run` or
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:func:`check_output`. Otherwise, ``None``.
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:func:`check_output`. Otherwise, ``None``. This is always
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:class:`bytes` when any output was captured regardless of the
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``text=True`` setting. It may remain ``None`` instead of ``b''``
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when no output was observed.
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..attribute::stdout
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..attribute::stderr
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Stderr output of the child process if it was captured by:func:`run`.
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Otherwise, ``None``.
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Otherwise, ``None``. This is always:class:`bytes` when stderr output
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was captured regardless of the ``text=True`` setting. It may remain
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``None`` instead of ``b''`` when no stderr output was observed.
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..versionadded::3.3
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