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Serialization · interview question

A bug appears around csv parsing. What is the strongest first debugging move?

Multiple choiceEasychapter-4-curatedpremiumserializationcsv-parsing
python
import csv

with open("orders.csv", newline="", encoding="utf-8") as handle:
    rows = list(csv.DictReader(handle))
print(rows[:1])
Choose one answer
Answer and explanation

Correct answer

C. 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. Assuming every CSV row is well-formed usually delays failure until much later in the pipeline.

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