Practice Arena

Python Coding
Challenges

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

467 challenges 330 easy 120 medium 17 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

OOP & Classes easy

Stack class

Implement a Stack class with push, pop, peek, is_empty, and size.

OOP stack data-structures

OOP & Classes medium

Linked list reversal

Implement a singly linked list and a function to reverse it in place.

linked-list OOP pointers

OOP & Classes medium

Matrix addition operator

Implement a Matrix class that supports + and * operators.

OOP dunder matrix

OOP & Classes easy

Event emitter basics

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

oop callbacks events

OOP & Classes easy

Rectangle class

Implement a Rectangle class with properties, methods, and special methods for basic geometry and comparison.

classes magic-methods geometry

OOP & Classes medium

Complex Number Class

Implement a Complex class supporting addition, subtraction, multiplication, division, equality, and string formatting.

classes magic-methods arithmetic

OOP & Classes easy

Queue class (list-based)

Implement a Queue class with enqueue, dequeue, peek, is_empty, and is_full methods using a list.

OOP & Classes medium

Comparable mixin

Create a Comparable mixin that auto-generates all rich comparison operators from a single __lt__ method.

oop mixin dunder-methods

OOP & Classes medium

Class Method Factory

Create a class method factory that dynamically adds methods to a class based on a mapping of names to behaviors.

oop metaprogramming factory

OOP & Classes easy

Abstract Base Class

Create an abstract Shape class and implement Rectangle and Circle subclasses with area and perimeter.

abc abstract oop

OOP & Classes medium

Reentrant Lock Manager

Implement a ReentrantLock class with acquire, release, locked, owner, and helper functions that test thread-safety with real threads.

threading locking reentrant

Showing 11 challenges · OOP & Classes

OOP & Classes — Python coding challenges

What you will find here

This page lists oop & classes challenges — real Python problems you solve in the browser IDE with instant test feedback. Each challenge includes a clear brief, starter code, and automated checks.

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.