Pythonic Data Processing · interview question
A bug appears around lazy pipelines. What is the strongest first debugging move?
Multiple choiceHardchapter-8-curatedpremiumpythonic-data-processinglazy-pipelines
filtered = (row for row in rows if row["subtotal"] > 100)
top_rows = list(filtered)[:5]Answer and explanation
Correct answer
D. 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. Layering too many lazy transformations can make debugging and reasoning harder than a simple explicit loop.
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