Explain the iteration protocol.
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What is the difference between an iterable and an iterator?
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iterators
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An iterable has __iter__ and can produce an iterator (lists, strings, dicts). An iterator has __next__ and yields items one by one until StopIteration. for loops call iter() then next() under the hood. Generators are iterators.
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PYiter()/next(), StopIteration, and one-shot exhaustion
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