Lightning-Fast DataFrames with Polars

Lazy Evaluation & GroupBy

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Eager vs Lazy: Two Evaluation Modes

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IN THIS LESSON

YOU’RE LEARNING TO

↗learner can explain the difference between eager and lazy evaluation

↗learner can create a lazy query with scan_csv and collect results

↗learner can perform grouped aggregations with group_by().agg()

↗learner can perform inner, left, and cross joins between DataFrames

↗learner can explain why lazy evaluation scales better to large datasets