[issue18748] io.IOBase destructor silence I/O error on close() by default

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> Same problem using Python 3.6.8 on Ubuntu 18.04 LTS.

To be clear: this issue is NOT a bug in Python, but a bug in your application. You must fix your application. You can try to run it on Python 3.8 with python3.8 -X dev to get a log on the error. Good luck to debug it ;-)

The change that I made is only to add a log to help developers to find their own bugs ;-)

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<https://bugs.python.org/issue18748>
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