Learn Python, FastAPI, ML & AI — interactively
100+ beginner-friendly chapters with code that runs in your browser. No setup. No accounts. Built by engineers, for engineers.
# Try this in your browser →
from sklearn.linear_model import LinearRegression
import numpy as np
X = np.array([[1],[2],[3],[4]])
y = np.array([2, 4, 6, 8])
model = LinearRegression().fit(X, y)
print(model.predict([[5]]))
# → [10.]🔥 Featured courses
Most popularPython — Complete Beginner Course
Master Python from print("hi") to decorators, OOP, generators, async. 16 hands-on chapters, every snippet runnable.
FastAPI — Build Modern APIs
Async Python web framework. Pydantic, dependency injection, JWT auth, deploying ML models, Docker.
Machine Learning — 100 Days Course
Full classical-ML curriculum from EDA to ensembles. Real datasets, sklearn pipelines, production patterns.
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Compose LLM apps: chains, prompts, output parsers, RAG, agents. Lego set for AI engineers in 2026.
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Browse by categoryFoundations
Variables · loops · functions · OOP · async
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EDA · regression · classification · ensembles
AI / LLM Stack
✨ Why this hub
Runs in your browser
Every Python snippet has a ▶ Run button — powered by Pyodide. No installation, no accounts. Just click and execute.
Truly beginner-friendly
Every chapter starts with the mental model + a diagram. Plain English first, then code. No jargon you can't decode.
Real production patterns
Minimal example to get it working, then the real-world version with validation, error handling, edge cases.
Built-in recall tests
Every chapter ends with flashcard-style Q&A. Quiz yourself before moving on — answers reveal on click.
Visual everywhere
Mermaid diagrams in every chapter. Click to zoom. Architecture, request flow, state machines — explained visually.
Free, forever
No paywalls. No drip content. No "upgrade" buttons. Built as a personal "second brain" — open to everyone.