Ronald Oussoren added the comment:

I do have a usecase for this: subclasses of int. 

Having slots would be nice for a reasonably efficient implementation of named 
constants (as recently discussed on python-ideas), and I'm already using a 
subclass of int of PyObjC to attach a single other value to a Python integer. 
In both cases the overhead of the __dict__ is pretty large.

----------
nosy: +ronaldoussoren
versions: +Python 3.4 -Python 3.3

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<http://bugs.python.org/issue1173475>
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