Brython Offline Interactive Shell and File Editor

Brython Offline is a single .html file that contains Brython, the browser-based Python interpreter, and a simple tabbed file editor. Now to do basic Python exercises you don't need to install Python, just open this one html file in a browser. No ads. No registration. No subscription. You can right-click and save the page and own it forever.

Just download and open brython-3.14.3-offline.html in a web browser and enter Python instructions into the interactive shell.

There are certain limitations: you can't access the file system or open files for reading and writing. The time.sleep() function doesn't work in JavaScript's single threaded environment. However, you can affect the DOM through Python code. See the Brython documentation for more info.

What is Brython?

Brython is an implementation of Python 3 that runs directly in a web browser.

Instead of writing JavaScript for browser behavior, you can write Python. Brython translates/executes that Python using JavaScript so it can interact with the page, DOM, events, and browser APIs.

Example:

<script type="text/python">
from browser import document

def hello(event):
    document["output"].text = "Hello from Python"

document["button"].bind("click", hello)
</script>

It is mainly useful for browser scripting and educational projects. It is not CPython running in the browser, so compatibility with Python packages—especially packages with native extensions—is much more limited than with Pyodide.

What's the difference between Brython and Pyodide?