Playground

Two sandboxes that run in your browser. Python (Pyodide) loads on first run; SQL (SQLite via WASM) is instant. Both come pre-seeded so you can experiment immediately.

Python

via Pyodide

▶ Python · Pyodide

Ready

# Welcome to the Python playground.
# Code here runs entirely in your browser via Pyodide.
# numpy, pandas, scikit-learn and others can be installed on demand.

import math

def fibonacci(n):
    a, b = 0, 1
    out = []
    for _ in range(n):
        out.append(a)
        a, b = b, a + b
    return out

print("First 10 Fibonacci numbers:", fibonacci(10))
print("φ (golden ratio) ≈", (1 + math.sqrt(5)) / 2)

Output

(click Run)

Tab inserts 4 spaces. To use numpy / pandas in your own lessons, pass packages=[…].

SQL

SQLite · WASM

▶ SQL · SQLite WASM

Ready · ⌘↵ runs

-- A sample query against the seeded analytics schema.
-- Tables available: users, products, orders.

SELECT
  u.country,
  COUNT(*) AS orders,
  ROUND(SUM(p.price * o.qty), 2) AS revenue
FROM orders o
JOIN users    u ON u.id = o.user_id
JOIN products p ON p.id = o.product_id
GROUP BY u.country
ORDER BY revenue DESC;

Result

(click Run)

Press ⌘ + Enter to run. The seed schema is reset every time you click Reset.

What can the playground do?

Run Python 3.12 with the full standard library.
Install third-party packages: numpy, pandas, scikit-learn, matplotlib, and most of PyPI that has wheels.
Execute SQLite queries with full SQL-92 plus CTEs and window functions.
Everything runs in your browser — your code never leaves your laptop.