Code Quality · interview question
A bug appears around mypy feedback. What is the strongest first debugging move?
Multiple choiceMediumchapter-10-curatedpremiumcode-qualitymypy-feedback
def subtotal(lines: list[float]) -> float:
return sum(lines)Answer and explanation
Correct answer
A. 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. Ignoring mypy entirely often leaves refactors depending on luck and manual re-reading.
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