Practice Arena

Python Coding
Challenges

Write real Python in the browser. Instant feedback. From beginner to expert.

577 challenges 370 easy 180 medium 27 hard

All Easy Medium Hard

All Python Basics Strings & Text Lists & Arrays Dicts & Sets Functions & Closures OOP & Classes Data Structures & Algorithms Advanced Python Iterators & Generators Decorators & Context Managers Error Handling & Exceptions Regular Expressions Math & Number Theory Bit Manipulation Dynamic Programming Trees & Binary Trees Graphs & Graph Algorithms Recursion & Backtracking Greedy Algorithms Binary Search Two Pointers & Sliding Window Stacks & Queues Heaps & Priority Queues Linked Lists Matrix & 2D Arrays Datetime & Time Calculations Data Formats & Parsing SQL & SQLite Numpy & Vectorized Computing Cryptography & Hashing

OOP & Classes easy

Event emitter basics

Implement an EventEmitter class with subscribe/emit/unsubscribe functionality.

oop callbacks events

OOP & Classes medium

Design Twitter Feed

Implement a Twitter class with postTweet, getNewsFeed, follow, and unfollow methods.

classes sorting timeline

Data Structures & Algorithms medium

Design Front Middle Back Queue

Implement a data structure that supports push/pop at front, middle, and back of a queue.

queue deque data-structures

Stacks & Queues easy

Max Stack Design

Implement a MaxStack class with push, pop, top, and get_max operations.

stack design max

Showing 4 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.