[issue36829] Add sys.unraisablehook() to custom how "unraisable exceptions" are logged

[STINNER Victor]

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

Follow-up:

* PR 13487 backports enhancement and bugfix to Python 3.7
* PR 13488 adds _PyErr_WriteUnraisableMsg() and adds 'err_msg' field to sys.unraisablehook
* PR 13490 adds test.support.catch_unraisable_exception()

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36829>
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