Daniel Stutzbach <stutzb...@google.com> added the comment:

Could you add a comment above the lines defining self._BytesIO, describing why 
they're being set?  Someone else might see them as unnecessary and rip them out 
if there's no explanation.

Can a test launch Python in a subprocess, set up the appropriate data 
structure, let the subprocess Python shutdown, then check the subprocess's 
stderr for the error?

It's a little convoluted, but perhaps it could be built into a general utility 
function that could be used to test __del__ methods in other modules, too.

Not sure that it's worth the effort though.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11640>
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