Practice Arena

Python Coding
Challenges

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

819 challenges 506 easy 280 medium 33 hard

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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

Python Basics easy

Fahrenheit to Celsius

Implement a function that converts degrees Fahrenheit to degrees Celsius.

temperature arithmetic conversion

Data Structures & Algorithms medium

Eulerian Path Check

Given the number of vertices and an edge list of an undirected graph, decide if it has an Eulerian path.

graph eulerian degree

Graphs & Graph Algorithms easy

Find the Town Judge

Given n people and a trust array, return the town judge or -1.

graph indegree outdegree

Matrix & 2D Arrays easy

Rotate Image 90 Degrees Clockwise

Rotate a square matrix 90 degrees clockwise and return the rotated matrix.

matrix rotation in-place

Matrix & 2D Arrays medium

Rotate Matrix Layers

Given a square matrix, rotate each concentric layer 90 degrees clockwise.

matrix rotation in-place

Showing 5 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.