Python Fundamentals · interview question

If you wrote a test around tracing and code reading, what should the test prove first?

Multiple choiceMediumchapter-1-curatedpremiumpython-fundamentalstracing-and-code-reading

python

subtotal = 20 * 4
discount = 10 if subtotal > 100 else 0
final_total = subtotal - discount
print(subtotal, discount, final_total)

Delay clarity until production traffic reveals the edge case and then patch it under pressure.Solve the symptom with comments only and avoid changing the code shape around tracing and code reading.Keep tracing and code reading implicit so the script stays short and hope the next engineer infers the rule.That the rule behaves correctly at the boundary cases the lesson is trying to make explicit.

Answer and explanation

Correct answer

D. That the rule behaves correctly at the boundary cases the lesson is trying to make explicit.

Why

Good tests make the design safer to change because they lock in the meaningful behavior rather than surface-level implementation details.

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If you wrote a test around tracing and code reading, what should the test prove first?

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