LeetStats

LeetCode-style practice for data-science fluency: NumPy, pandas, matplotlib/seaborn, scikit-learn, statistics and quant research. 211 short, single-concept problems you drill until the syntax is automatic, plus open-ended interview prompts to assemble them yourself.

Live app: https://cxmko.github.io/leetstats/

• Runs entirely in your browser (Python via Pyodide): no install, no account.
• Run against the example, submit to hidden tests, hints, solutions, spaced-repetition reviews, a daily queue across all sections, flashcards, a playground, 45-minute mock interviews and stats.
• Progress is saved in your browser only; use the ⋯ menu to export/import it between devices.
• Offline: download index.html and double-click it (Python still loads from the CDN on first use).

Building, validating and adding problems: see DEVELOPMENT.md and CLAUDE.md.

License

MIT