Practice Arena

Python Coding
Challenges

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

925 challenges 556 easy 323 medium 46 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

Python Basics easy

Cycle a List Once

Implement a function that rotates a list right by one position.

lists rotation indexing

Strings & Text easy

Is rotation of another string

Write a function to determine if one string is a rotation of another string.

strings rotation membership

Strings & Text easy

Rotate String Right

Implement a function that rotates a given string to the right by a specified number of positions, handling shifts larger than the string length.

strings rotation slicing

Lists & Arrays easy

Rotate Left by k

Implement a function that rotates a list left by k positions.

rotation lists slicing

Lists & Arrays easy

Rotate List Right by k

Implement a function that rotates a list to the right by k positions.

lists rotation modulo

Bit Manipulation easy

Rotate Bits Left

Implement a function that rotates the bits of an integer to the left by a specified number of positions.

bit-manipulation integer rotation

Binary Search medium

Find Minimum in Rotated Sorted Array

Implement a function that finds the minimum element in a rotated sorted array of distinct integers in O(log n) time.

binary-search arrays rotation

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

Shift 2D Grid

Implement a function to shift a 2D grid right by k positions, flattening the grid and wrapping elements.

grid list modulo

Matrix & 2D Arrays medium

Rotate Matrix Layers

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

matrix rotation in-place

Showing 1–10 of 10 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.