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Calculating cumulative rentals

Rolling sums smooth short-term noise, but sometimes you need the running total from the very start. Cumulative sums track how usage builds up over time, useful for capacity planning and monthly reporting.

polars is loaded as pl. The DataFrame bikes is available with columns time, rentals, and temp.

Cet exercice fait partie du cours

<cours>Data Transformation with Polars</cours>
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Instructions de l’exercice

  • Add a column cumulative_rentals with the cumulative sum of rentals.

Exercice interactif pratique

Essayez cet exercice en complétant ce code d’exemple.

# Add a cumulative sum of rentals
bikes.with_columns(
    pl.col("rentals").____().alias("____")
)
Modifier et exécuter le code