[issue16125] open accepts arbitrary mode strings as long as they contain U

[Nick Coghlan]

Nick Coghlan added the comment:

+1 for a Py3k warning. Filing a pylint --py3k RFE may also be appropriate.

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nosy: +ncoghlan

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16125>
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