Nick Coghlan added the comment:

"__classcell__" in __slots__ doesn't really make sense, as unlike __qualname__ 
(which turns into a real class level attribute and can be useful to override on 
instances), it's only a transient entry in a class definition namespace - 
types.__new__ pops it automatically so it doesn't get turned into an attribute.

However, consistency is a good thing, so allowing it seems reasonable.

Regarding the specifics, the pending patch on issue 23722 makes it a TypeError 
to ever set __classcell__ to anything other than a real cell object.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24329>
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