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Code Quality · interview question

What is the healthiest performance judgment around mypy feedback?

Multiple choiceMediumchapter-10-curatedpremiumcode-qualitymypy-feedback
python
def subtotal(lines: list[float]) -> float:
    return sum(lines)
Choose one answer
Answer and explanation

Correct answer

D. Measure before optimizing, then change the part that actually dominates cost instead of guessing from style alone.

Why

Premature optimization is usually weaker than targeted optimization backed by measurement.

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