Python coding challenges: "linear-algebra"

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Python Basics easy

Cosine Similarity of Vectors

Compute the cosine similarity between two equal-length numeric vectors using pure Python.

math linear-algebra similarity

+10 pts 15m

Math & Number Theory medium

Polynomial Fit Coefficients

Implement a function that returns the coefficients of the best-fit quadratic polynomial for given points.

least-squares linear-algebra polynomial

+25 pts 25m

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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.

Python Coding Challenges