Rectangle class
Implement a Rectangle class with properties, methods, and special methods for basic geometry and comparison.
Complex Number Class
Implement a Complex class supporting addition, subtraction, multiplication, division, equality, and string formatting.
Abstract Base Class
Create an abstract Shape class and implement Rectangle and Circle subclasses with area and perimeter.
Design Twitter Feed
Implement a Twitter class with postTweet, getNewsFeed, follow, and unfollow methods.
Observer pattern lite
Implement a simple Subject class supporting subscribe, unsubscribe, and notify observers.
Deck of Cards Class
Implement a Deck class representing a standard 52-card deck with shuffle, deal, and len support.
Playing card class
Design a PlayingCard class with suit, rank, color, and equality/comparison magic methods.
Metaclass Registry
Implement a metaclass that automatically registers every subclass in a class-level registry.
Context Manager Class
Implement a context manager class that measures execution time and sets duration, with None if an exception occurred.
Validation result object
Implement a ValidationResult class that tracks validation errors and can report validity.
Binary Search Tree Class
Build a BinarySearchTree class and a sequence runner that executes a list of operations.
Showing 1–11 of 11 challenges
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.