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

Reverse a string

Return the characters of the string in reverse order.

strings slicing

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

Strings & Text easy

Find substring index

Implement a function that returns the starting index of the first occurrence of a substring using only basic string indexing and slicing.

string search index

Lists & Arrays easy

Chunk a list into n-sized parts

Write a function that divides a list into sublists of at most n elements.

list chunking 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

Keep only even indexes

Given a list, return a new list containing only the elements at even indices (0, 2, 4, ...).

list slicing indexing

Lists & Arrays easy

Chunk list into groups

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

list slicing chunking

Showing 7 challenges · easy

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.