[issue6875] add os.close() suggestion to mkstemp documentation

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

That one has to close open files should be common knowledge.

And it's already documented that the filehandle returned is to be
treated as if coming from `os.open`, so the "isn't a file object" is
documented as well.

Insofar, I'm in agreement with David.

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resolution:  -> works for me
status: open -> closed

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<http://bugs.python.org/issue6875>
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