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467 challenges 330 easy 120 medium 17 hard

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Python Basics easy

Absolute Difference of Two Integers

Compute the absolute difference between two integers, regardless of order.

absolute difference math

Python Basics easy

Absolute Difference

Implement a function that returns the absolute difference between two numbers.

absolute value arithmetic function

Dicts & Sets easy

Pair with difference K

Count unordered index pairs with absolute difference exactly K, handling duplicates correctly.

dictionary set counting

Data Structures & Algorithms easy

Count pairs with given difference

Count how many unordered pairs in a list have a given absolute difference using an efficient approach.

hash map counting arrays

Showing 4 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.