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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.

说明

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