[issue5700] io.FileIO calls flush() after file closed

[Brian Quinlan]

Brian Quinlan <brian at sweetapp.com> added the comment:

cooperation.diff:
- change the close method to call .flush() and then ._close()
- only IOBase implements close() (though a subclass can override close
  without causing problems - so long as it calls super().close())
- .flush() invokes super().flush()
- ._close() invokes super()._close()
- FileIO is implemented in Python in _pyio.py so that it can have the
  same base class as the other Python-implemented files classes
- tests verify that .flush() is not called after the file is closed
- tests verify that ._close()/.flush() calls move correctly are 
  propagated correctly

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5700>
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