Python Fundamentals · interview question
A bug appears around tracing and code reading. What is the strongest first debugging move?
Multiple choiceMediumchapter-1-curatedpremiumpython-fundamentalstracing-and-code-reading
subtotal = 20 * 4
discount = 10 if subtotal > 100 else 0
final_total = subtotal - discount
print(subtotal, discount, final_total)Answer and explanation
Correct answer
B. 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. Jumping straight into edits without understanding the current behavior often turns one bug into two.
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