[issue43834] Use context manager in StringIO example

[John Hagen]

Change by John Hagen <johnthagen at gmail.com>:


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keywords: +patch
pull_requests: +24133
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/25401

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43834>
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