[issue4237] io.FileIO('foo', 'rt') prints a RuntimeWarning

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

Verified. The issue should be easy to fix.

I wonder why 'rt' is an invalid mode. Python 2.x supports 'rt'.

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nosy: +christian.heimes
priority:  -> normal

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<http://bugs.python.org/issue4237>
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