[issue2920] Patch to print symbolic value of errno in OSError.__str__()

[Zackery Spytz]

Change by Zackery Spytz <zspytz at gmail.com>:


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title: Patch to print symbolic value or errno in EnvironmentError.__str__() -> Patch to print symbolic value of errno in OSError.__str__()
versions: +Python 3.9 -Python 3.3

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue2920>
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