#3323: mention that if inheriting from a class without __slots__,
the subclass will have a __dict__ available too.
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@ -1600,6 +1600,10 @@ variable. Space is saved because *__dict__* is not created for each instance.
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Notes on using *__slots__*
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* When inheriting from a class without *__slots__*, the *__dict__* attribute of
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that class will always be accessible, so a *__slots__* definition in the
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subclass is meaningless.
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* Without a *__dict__* variable, instances cannot be assigned new variables not
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listed in the *__slots__* definition. Attempts to assign to an unlisted
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variable name raises :exc:`AttributeError`. If dynamic assignment of new
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