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Not another beginner tutorial. A direct translation layer from modern TypeScript to Python 3.14+, ending in a working AI agent, with every snippet executing real CPython in your browser via WebAssembly.

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hero.py

Starting Python…

# Everything on this site runs real CPython, in your browser.
users = [{"name": "ada", "age": 36}, {"name": "linus", "age": 54}]
# JS: users.filter(u => u.age > 40).map(u => u.name)
print([u["name"] for u in users if u["age"] > 40])
# JS: arr.at(-1)
print(users[-1]["name"])
# JS: "a-b-c".replace("-", "+")  -> "a+b-c"  (first only!)
print("a-b-c".replace("-", "+"))

hero.py — edit it and press Run (⌘⏎). Settled by CPython, not asserted.

Where to go next

01The courseSyntax and memory, dunder protocols, asyncio, typing, then an AI agent capstone. Each module ends in a kata you solve in the browser against real CPython.5 modules · about 7 hours00-start-here → 05-ai-engineering-capstoneStart the course
02Rosetta cheatsheetSearchable JS ↔ Python pairs across lists, dicts, closures, async and error handling, tagged footgun where the semantics quietly diverge.60 mappingsxs.map(x => x * 2) → [x * 2 for x in xs]
03Footgun simulatorSnippets that punish JavaScript instincts. Predict the output, then watch the interpreter settle it.20 snippets · settled by CPythonxs.sort() → None