Reverse vector order
Return elements in opposite order.
L2 norm of vector
Return Euclidean length.
Index of maximum value
Return index of largest value (first on tie).
Inclusive numeric range vector
Return [start, start+step, ...] through end inclusive.
Count elements in matrix
Return total scalar count.
Binarize vector at threshold
Return 1.0 where v[i] >= t else 0.0.
SHA256 Hash String
Write a function that returns the SHA256 hexadecimal digest of a given string.
Compute SHA-1 Hash String
Write a function that returns the SHA-1 hash of a string as a 40-character hex string.
Password Salt Hash
Implement a function that returns a secure salted SHA-256 password hash with a deterministic format.
SHA1 Hash String
Implement a function that returns the SHA1 hexadecimal digest of an input string.
Compute SHA256 Hash String
Implement a function that returns the SHA-256 hex digest of a given input string.
Showing 361–371 of 371 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.