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What Is an Iterator?

Explore the concept of iterators in Python and their importance in functional programming. Understand how iterators enable one-shot iteration over data streams and how the next function retrieves values sequentially until exhausted.

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You should be familiar with Python sequences. A sequence is an ordered collection of items, the most common ones being lists, strings, and tuples. But sequences rely on a couple of lower level types that are important in functional programming: iterators and iterables.

Iterators

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