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Automation Scripts · interview question

A bug appears around input assumptions. What is the strongest first debugging move?

Multiple choiceMediumchapter-1-curatedpremiumautomation-scriptsinput-assumptions
python
def validate_line(sku: str, quantity: int) -> None:
    if not sku:
        raise ValueError("sku is required")
    if quantity <= 0:
        raise ValueError("quantity must be positive")
Choose one answer
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. If the script quietly accepts malformed input, the later math and formatting steps only hide the original problem.

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