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[3.10] bpo-41147: [doc] contextlib.redirect_stdout() provides the new stream as context var (GH-21199) #26379

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7 changes: 4 additions & 3 deletions Doc/library/contextlib.rst
Original file line number Diff line number Diff line change
Expand Up @@ -312,10 +312,11 @@ Functions and classes provided:

For example, the output of :func:`help` normally is sent to *sys.stdout*.
You can capture that output in a string by redirecting the output to an
:class:`io.StringIO` object::
:class:`io.StringIO` object. The replacement stream is returned from the
``__enter__`` method and so is available as the target of the
:keyword:`with` statement::

f = io.StringIO()
with redirect_stdout(f):
with redirect_stdout(io.StringIO()) as f:
help(pow)
s = f.getvalue()

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