The One-Shot Generator Trap

Medium ⏱ 12 min 58% acceptance ★★★★★ 4.7

Generators are consumed once: summing one twice gives 0 the second time. Write stats(nums_iterable) returning (total, count, maximum) from a possibly-one-shot iterable by materializing it once into a tuple first — the defensive move when you must traverse twice. Return (0, 0, None) for an empty input.

Examples

Example 1

Input

stats(x * 2 for x in range(3))

Output

(6, 3, 4)

Explanation

The generator was captured once, then analyzed.

Constraints

Consume the input exactly once.
Empty input → (0, 0, None).

Topics

Iterators & Generatorsexhaustion

Companies

GoogleMicrosoftAdobe

Hints

Hint 1

data = tuple(nums_iterable) up front.

Hint 2

Then sum/len/max safely on the tuple.

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