🐍 PyDaily: learn Python a little every day

🚀 Try it live

PyDaily is a free, interactive Python revision site. Every lesson explains a concept in plain words and lets you run real Python right in the browser. Nothing to install and no login.

Live demo: https://gaganajain.github.io/pydaily/

What each lesson has

Part	What it does
📖 Meaning	The idea in plain English
🧩 Syntax	The pattern to remember
💡 Example	Real code you can run with one click
⚠️ Exam trap	The mistake examiners love to test
🎯 Your turn	A coding task, auto-graded against expected output
🧠 Quick check	Predict-the-output quiz questions

Features

• 41 lessons across 5 sessions: Basics, Logic & loops, Data structures, Functions & modules, Functional programming
• Real Python in the browser with Pyodide (CPython compiled to WebAssembly), running in a Web Worker with a 5-second timeout, so an infinite loop can't freeze the page
• Auto-grading: hidden test code is appended to the learner's code to grade functions
• Spaced repetition: finished lessons come back after 1, 3, 7, 14, then 30 days; a wrong answer resets the gap
• Exam mode: 10 random questions from all sessions or one session, with a list of lessons to revise
• Daily streak, progress per session, and saved code drafts (stored in the browser)
• Shareable links for each lesson (#loops) and exam scores you can challenge friends with
• Dark mode and a mobile layout

Tech

Plain HTML, CSS and JavaScript (no framework, no build step) · Pyodide/WebAssembly · Web Workers · localStorage · GitHub Pages

index.html   page shell
style.css    design (light and dark themes)
lessons.js   all lesson content (add a lesson = add one object)
app.js       routing, lesson view, grading, quiz, exam, streak, spaced repetition
worker.js    runs Python off the main thread

Run locally

python -m http.server 8000
# open http://localhost:8000

(A server is needed because browsers block Web Workers on file:// pages.)

Add a lesson

Add an object to LESSONS in lessons.js:

{
  id: "my-topic", session: 3, title: "My topic",
  meaning: "...", syntax: "...", example: "...", gotcha: "...",
  task: "...", starter: "...", expected: "...", solution: "...",
  quiz: [{ q: "print(1 + 1)", options: ["2", "11"], answer: 0, why: "..." }]
}

Roadmap

• Accounts and cloud sync (FastAPI + PostgreSQL)
• SM-2 spaced repetition per question
• AI tutor that explains wrong answers
• More sessions as the course continues

👩‍💻 Author

Gagana Jain A · GitHub

⭐ If PyDaily helps you learn, give it a star!