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

[Alexandre Vassalotti]

Alexandre Vassalotti <alexandre at peadrop.com> added the comment:

Overall, the patch looks good. I made a couple of fixes to make the
changes more robust.

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nosy: +alexandre.vassalotti
priority:  -> normal
type:  -> feature request
Added file: http://bugs.python.org/file10378/symbolic-errno.diff

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