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

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

I don't like the "import errno" while printing an exception...
It would be much more robust to store errorcode_dict in a static variable when python starts, and reuse it directly.

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue2920>
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