[issue2920] Patch to print symbolic value or errno in EnvironmentError.__str__()

[Zackery Spytz]

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


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pull_requests: +14755
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/14988

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