Python coding challenges: "unpacking"

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Lists & Arrays easy

Unzip pairs into two lists

Write a function that takes a list of pairs and returns two separate lists: first elements and second elements.

zip unpacking lists

+10 pts 10m

Dicts & Sets easy

Union of Many Sets

Implement a function that takes any number of sets and returns a sorted list of their union.

sets union flatten

+10 pts 10m

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Guide: free Python coding challenges

Practice Python by solving problems

PythonSkillset challenges are hands-on coding exercises from beginner to advanced. Open a challenge, read the problem, write Python in the split-pane editor, and run tests with Pyodide — no install required.

How to use the arena

Pick a category — basics, algorithms, strings, and more
Open a challenge, read the statement, and edit the starter code
Run tests, fix failures, then try a related quiz or tutorial lesson

Challenges vs tutorials and quizzes

Challenges test what you can build under constraints. For guided teaching, use our Python tutorials. For quick checks, try quizzes or copy snippets from code samples.

Python Coding Challenges