Caesar Cipher Shift
Implement a function to apply a Caesar cipher shift to a string, preserving case and ignoring non-letters.
Caesar Cipher Shift
Write a function that shifts letters in a string by a given amount, preserving case and ignoring non-letters.
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.
Caesar Cipher Decrypt
Implement a function that decrypts a Caesar cipher by shifting letters back by a given number.
Caesar Cipher Decrypt
Write a function that decrypts a Caesar cipher by shifting letters backward by a given key.
Multiply without multiply
Write a function that multiplies two integers using only addition, subtraction, and bit shifts — no * operator.
Gray Code Encode
Implement a function that converts a non-negative integer to its Gray code representation using bitwise XOR and shift.
Divide using shifts
Implement division of two integers using only bit shifts and arithmetic, without using division or modulo operators.
Shift 2D Grid
Implement a function to shift a 2D grid right by k positions, flattening the grid and wrapping elements.
Showing 1–9 of 9 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.