Iterators and Generators · interview question
A bug appears around iterator protocol. What is the strongest first debugging move?
Multiple choiceHardchapter-8-curatedpremiumiterators-and-generatorsiterator-protocol
numbers = iter([1, 2, 3])
print(next(numbers))
print(next(numbers))Answer and explanation
Correct answer
C. Trace one concrete example, inspect the state transitions, and compare them to the intended rule before rewriting anything.
Why
That approach is reliable because it creates evidence. Treating iteration as magic makes advanced debugging and custom data-flow design much harder.
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