Kristján Valur Jónsson added the comment:

Basically the logic is this:  When the class goes away, it _always_ calls 
remove_subclass().  Now, this may be before or after the weakref has been clear 
so that it will either find itself in a weakref, or a clear weakref.

In case this logic is flawed, we know that when remove_subclass() is called, 
exactly one child is removed.  Whether it is us, or some previous class, is 
irrelevant.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17936>
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