New submission from Andras Szalai:

In the class `logging.handlers.QueueListener` the `_sentinel` is `None`.

But
>>> a = None
>>> b = None
>>> a is b
True

Because of this, the QueueListener stops if it receives a `None`.
Were the sentinel a proper instance, like:
_sentinel = {}

This would not happen.

----------
messages: 177385
nosy: Andras.Szalai
priority: normal
severity: normal
status: open
title: logging.handlers.QueueListener sentinel should not be None
type: behavior
versions: Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16671>
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