Creating a Categorical column
Back to the movie dataset from the streaming startup. Most rows in original_language use the same handful of codes (en, fr, es, …). Casting to Categorical encodes each unique label as an integer behind the scenes, saving memory on repeated strings.
Diese Übung ist Teil des Kurses
<Kurs>Scaling and Optimizing Data Pipelines with Polars</Kurs>Übungsanweisungen
- Cast the
original_languagecolumn topl.Categorical.
Interaktive praktische Übung
Versuche dich an dieser Übung, indem du diesen Beispielcode vervollständigst.
movies_cat = movies.with_columns(
# Cast to Categorical to save memory
pl.col("original_language").____(pl.____)
)
result = movies_cat.select("movie_title", "original_language").head(8)
print(result)