Guido van Rossum wrote: > I would need to think more about this. I'm tempted not to do this, and > let these ABCs denote the *explicit* presence of __contains__ and > __iter__, respectively. Something that's iterable but doesn't > implement __contains__ supports the 'in' operator very inefficiently > (through linear search) which we might not want to encourage. It could be worse. Is a container necessarily finite?
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