Control Flow · interview question

What is the healthiest performance judgment around for loops?

Multiple choiceMediumchapter-2-curatedpremiumcontrol-flowfor-loops

python

line_totals = [19.99, 8.50, 42.00]
grand_total = 0.0
for line_total in line_totals:
    grand_total += line_total
print(grand_total)

Solve the symptom with comments only and avoid changing the code shape around for loops.Measure before optimizing, then change the part that actually dominates cost instead of guessing from style alone.Delay clarity until production traffic reveals the edge case and then patch it under pressure.Keep for loops implicit so the script stays short and hope the next engineer infers the rule.

Answer and explanation

Correct answer

B. 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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What is the healthiest performance judgment around for loops?

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