Python double underscore mangling

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Name mangling occurs during the evaluation of a class statement. In the case of Bar, the __cache attribute is not defined as part of the class, but rather added to a specific object after the fact.

(Actually, that may not be entirely correct. Name mangling may occur during the evaluation of the __new__ method; I do not know. But regardless, your __cache is added explicitly to a single object, not added by the class code.)

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