[issue18853] Got ResourceWarning unclosed file when running Lib/shlex.py demo

[Terry J. Reedy]

Terry J. Reedy added the comment:

I think the warning should be silenced on all versions where it occurs. There is no real problem here, but there can be with multiple opens without close on non-refcounted interpreters. Patch looks good but I have not tried it.

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nosy: +terry.reedy
stage:  -> patch review
versions: +Python 2.7, Python 3.3

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<http://bugs.python.org/issue18853>
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