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  3. Scaling and Optimizing Data Pipelines with Polars
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Extracting a primary genre

You've joined the data team at a streaming movie startup. They store film metadata in a Parquet file where each movie's genres is a list of strings, since most films span several genres. Pull the first listed genre out of each row into a clean top-level primary_genre column.

polars is loaded as pl, and the DataFrame movies is pre-loaded from the Parquet file.

Pokyny

100 XP
  • Extract the first element from each row's genres list using a list expression.
  • Alias the new column as primary_genre.