Explain Python's itertools module.

Quick Answer itertools provides efficient iterator building blocks. chain() combines multiple iterables. cycle() repeats infinitely. islice() slices iterators. groupby() groups consecutive elements. product() computes Cartesian product. permutations() and combinations(). count() infinite counter. dropwhile()/takewhile() conditional iterators. All are lazy (memory efficient). Used heavily in data processing pipelines.

Answer

Provides fast, memory-efficient iterators.
Functions: count(), cycle(), combinations(), product().
Useful for looping, combinatorics, pipelines.

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Explain Python's itertools module.

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