Practice Arena

Python Coding
Challenges

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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

Strings & Text easy

Title case converter

Return the string with each word capitalised.

Strings & Text easy

Longest word in a sentence

Write a function that returns the longest word from a sentence, with first-occurrence tie-breaking.

strings parsing split

Strings & Text easy

Initials from a Full Name

Return the uppercase initials of each word in a given full name.

strings splitting uppercase

Strings & Text easy

Count words in a sentence

Implement a function to count words in a sentence, ignoring extra whitespace and handling empty strings.

strings split counting

Strings & Text easy

Reverse Words in a Sentence

Reverse the order of words in a sentence while preserving single spaces between words.

strings split reverse

Strings & Text easy

Abbreviate Name

Create a function that takes a full name and returns an abbreviated version with initials and the last name.

strings formatting split

Strings & Text easy

Parse Log Line

Write a function that parses a log line and returns a dictionary with timestamp, level, and message.

string-parsing split strip

Strings & Text easy

Split on camelCase

Given a camelCase string, split it into words at uppercase letters and return them as lowercase words.

strings parsing camelcase

Strings & Text easy

Normalize Whitespace

Write a function that normalizes any whitespace in a string to single spaces and trims the ends.

strings whitespace split-join

Lists & Arrays easy

Chunk list into groups

Implement a function that splits a list into sublists of a given size.

list slicing chunking

Showing 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.