[issue4233] open(0, closefd=False) prints 3 warnings

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

@christian: Your patch doesn't work: if close() if called twice, the 
file is really closed :-/

Here is a new patch:
 - _FileIO.close() sets self->fd to -1 but don't show a warning anymore 
because the operation is valid: it does really close the _FileIO object
 - add two tests for two problems: read is now blocked if the file is 
closed, and the warning displayed by FileIO.__del__

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keywords: +patch
nosy: +haypo
Added file: http://bugs.python.org/file11921/fileio_closefd.patch

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