What is the difference between an iterable, an iterator and a generator?
Answer
- Iterable: anything you can loop over; implements
__iter__ (list, dict, str, file). - Iterator: object with
__next__ that remembers its position and raises StopIteration at the end; iter(iterable) gives you one. Single pass. - Generator: an iterator created by a function with
yield (or a generator expression). Its state pauses between yields; values are produced lazily. - Why it matters: streaming big files or DB rows with constant memory, pipelines, infinite sequences.
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