Practice Arena

Python Coding
Challenges

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819 challenges 506 easy 280 medium 33 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

Parse environment variables

Write parse_env_vars that parses KEY=VALUE lines into a dict, converting booleans/numbers and ignoring comments.

strings parsing dictionaries

Strings & Text medium

Parse key-value lines

Parse structured key-value lines into a dictionary with support for quoted values and escaped characters.

parsing strings dictionary

Strings & Text easy

Parse numbered list

Take a string containing a numbered list and return a clean list of the item texts.

string parsing strip split

Regular Expressions easy

Multiline anchor match

Extract lines beginning with a plain-text prefix from multiline strings using Python's re module.

regex anchors multiline

Greedy Algorithms medium

Job Sequencing with Deadlines and Profits

Given jobs with deadlines and profits, choose a subset that maximizes profit while meeting deadline constraints.

greedy sorting scheduling

Two Pointers & Sliding Window medium

Container With Most Water

Given an array of heights, find the maximum area between two vertical lines that can hold water.

two-pointers array maximization

Two Pointers & Sliding Window easy

Container With Most Water

Compute the maximum area between two vertical lines in an array of heights.

two-pointers array area-calculation

Showing 7 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.