Counting genres per movie
The team also wants a quick summary column that counts how many genres are listed for each movie. Use a list expression to create genre_count.
You're still working with the same movies DataFrame.
This exercise is part of the course
Scaling and Optimizing Data Pipelines with Polars
Exercise instructions
- Count the number of genres in each row's
genreslist. - Alias the new column as
genre_count.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
result = movies.select(
"movie_title",
"genres",
# Count the genres
pl.col("genres").list.____().alias("____"),
).head(8)
print(result)