[issue18748] io.IOBase destructor silence I/O error on close() by default

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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pull_requests: +13234

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue18748>
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