Collecting two reports together

The dashboard needs two related summaries: digital checkouts by format and digital checkouts by month. Both queries scan the same CSV. Hand both lazy queries to pl.collect_all() so Polars plans them together and reads the file just once.

Two LazyFrame queries have already been built for you:

checkouts_by_format: total digital checkouts grouped by format.
checkouts_by_month: total digital checkouts grouped by month.

This exercise is part of the course

Scaling and Optimizing Data Pipelines with Polars

View Course

Exercise instructions

Use the right method to execute both lazy queries at once.
Pass checkouts_by_format first and checkouts_by_month second in the list.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Execute both lazy queries together so Polars shares the scan
results = pl.____([
    # Pass checkouts_by_format first, then checkouts_by_month
    ____,
    ____,
])

# Inspect each result
print(results[0])
print(results[1])

Edit and Run Code