[issue30332] Errors that aren't actually defined are purple in the IDLE

[Terry J. Reedy]

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


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type:  -> behavior
versions: +Python 3.6, Python 3.7 -Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30332>
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