Using a categorical expression

The team wants a quick flag for movies whose original_language code starts with e (English, Estonian, …). Polars' categorical namespace has its own string-like expressions that work directly on the encoded column, no cast back to String needed.

movies_cat is available with original_language already cast to pl.Categorical.

Deze oefening maakt deel uit van de cursus

Scaling and Optimizing Data Pipelines with Polars

Bekijk cursus

Oefeninstructies

Use the categorical namespace to check whether original_language starts with "e".
Alias the new boolean column as starts_with_e.

Interactieve oefening met praktijkervaring

Probeer deze oefening door deze voorbeeldcode aan te vullen.

result = movies_cat.select(
    "movie_title",
    "original_language",
    # Flag categorical values starting with "e"
    pl.col("original_language").____.starts_with("____").alias("____"),
).head(8)
print(result)

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