[issue15318] IDLE - sys.stdin is writeable

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

As an additional note: the change to monkey-patching breaks the test 

isinstance(sys.stdout, io.TextIOBase)

which currently succeeds.

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<http://bugs.python.org/issue15318>
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