[issue17852] Built-in module _io can lose data from buffered files at exit

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I think it would be quite disruptive to create a reference cycle each time open() is called.  It may also break user scripts.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue17852>
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