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

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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

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

OOP & Classes easy

Observer pattern lite

Implement a simple Subject class supporting subscribe, unsubscribe, and notify observers.

observer design-pattern classes

OOP & Classes easy

Playing card class

Design a PlayingCard class with suit, rank, color, and equality/comparison magic methods.

oop classes magic-methods

OOP & Classes medium

Seat Manager Design

Implement a SeatManager class that supports reserving the smallest available seat and unreserving seats.

heap class-design simulation

Showing 1–5 of 5 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.