[issue18151] Idlelib: update to "with open ... except OSError" (in 2.7, leave IOError)

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


Added file: http://bugs.python.org/file30489/grep_it.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18151>
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