Return Values

Functions do more than just execute code. They can compute results and send them back to wherever they were called. Returning Data Multiple Return Values Python functions can return multiple values as a tuple, which you can unpack into separate variables when calling the function. Functions can also return multiple values as a tuple, which you can unpack into separate variables. A return statement immediately exits the function, so any code written after return in the same block is unreachable and will never execute. Returning None explicitly and implicitly are equivalent. Both signal that the function completed without producing a meaningful value for the caller. Functions that return multiple values as a tuple are a common Python pattern for situations where two related results, such as

About This Interactive Section

This section is part of the Python Foundations: Intermediate lesson on DataDriven, a free data engineering interview prep platform. Each section includes explanations, worked examples, and hands-on code challenges that execute in real time. SQL queries run against a live PostgreSQL database. Python runs in a sandboxed Docker container. Data modeling problems validate against interactive schema canvases. All content is framed around what data engineering interviewers actually test at companies like Meta, Google, Amazon, Netflix, Stripe, and Databricks.

How DataDriven Lessons Work

DataDriven combines four interview rounds (SQL, Python, Data Modeling, Pipeline Architecture) with adaptive difficulty and spaced repetition. Easy problems get harder as you improve. Weak concepts resurface until you master them. Your readiness score tracks progress across every topic interviewers test. Every lesson section ends with problems you solve by writing and running real code, not by picking multiple-choice answers.