Tutorial Sneak Peek: "Lazy Looping in Practice..."
summary
Claims that Python for loops only iterate a single iterable and that common helpers are what enable indexing, reversing, and parallel looping; inspects the enumerate, zip, and reversed implementations to show how they yield items lazily and turn an O(n) allocation into O(1) streaming memory; builds three concrete looping helpers with iterators and generators, runs them on large inputs, and demonstrates they behave correctly and avoid eager copying.
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