Control Flow · interview question
A bug appears around guard clauses. What is the strongest first debugging move?
Multiple choiceEasychapter-2-curatedpremiumcontrol-flowguard-clauses
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")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. Letting bad state flow deeper into the script makes every later line harder to reason about.
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