Raymond Hettinger added the comment: One other thought: Returning NotImplemented may be an easy change but it isn't clear that it would provide a sensible capability for mapping views. The non-iterable *other* argument would need to have a __ror__() method than could do something useful with a KeysView or ItemsView argument. That seems like an improbable use case (which is why I presume this has never come up before).
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