About

Pyfied is an interactive Python learning website. The idea is simple: learn a concept → see how it works → run the code → change it → practise → build a project, without leaving the page.

How your code runs

When you press Run, your browser downloads a Python runtime called Pyodide — the standard CPython interpreter compiled to WebAssembly — and runs your program on your own device, inside a background worker so the page stays responsive. Our server only sends the lesson pages; it never executes your code. That keeps the site fast, private and free.

The first run takes a few seconds while the runtime downloads (about 10 MB, cached afterwards). Packages such as NumPy or pandas download the first time you import them.

What it is not

• Not a replacement for Python on your computer — browser Python cannot open desktop windows, start processes or connect to databases. See the package compatibility list.
• Not a cloud execution service — no code runs on our servers.
• Not a chatbot — it is a fixed, structured curriculum, and every example is executed automatically before publishing.

Who is behind Pyfied

Pyfied is created and maintained by Yogesh Sharma (LinkedIn profile). He is responsible for what is published here and for fixing mistakes that readers report.

How the content is tested. Nothing is taken on trust: every example runs automatically on Python 3.13, its real output is compared with the output shown on the page, and every exercise solution is checked against its tests before a page is published. Explanations are written for people who learn by doing: short, with a picture of what happens in memory, code you can run and the mistakes beginners really make.

We keep the curriculum deliberately broad and structured: a step-by-step tutorial, practice exercises, a reference for methods and built-in functions, classic programs, side-by-side comparisons, how-to answers, cheat sheets and a glossary.

Quality

Every example and exercise on this site is stored as version-controlled content and executed automatically with the same runner the browser uses, so the outputs you see on the page are the outputs you get.

Read the details in our editorial and testing policy. Found a mistake? Tell us.