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.

Bu egzersiz, kursun bir parçasıdır

Scaling and Optimizing Data Pipelines with Polars

Kursa Göz Atın

Egzersiz talimatları

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

Uygulamalı etkileşimli egzersiz

Bu egzersizi bu örnek kodu tamamlayarak deneyin.

result = movies.select(
    "movie_title",
    "genres",
    # Get the first genre
    pl.col("genres").list.____(0).alias("____"),
).head(8)
print(result)

Kodu Düzenle ve Çalıştır