Python Runner

Run Python 3 in your browser using Pyodide (WebAssembly). NumPy, math, and stdlib are available. No server, no data leaves your device.

Examples:

Output appears here…

Python 3 via Pyodide. Available packages: numpy, math, json, re, datetime, collections, itertools, functools, and most stdlib modules. For heavy packages (pandas, scipy), use import micropip; await micropip.install("package").

About this tool

Run Python 3 code right in your browser, powered by Pyodide (WebAssembly). NumPy, math, json, re, datetime, and the full Python standard library are available with no installation. It's perfect for quickly testing algorithms, exploring data structures, and learning Python without setting up a local environment.

How to Run Python in the Browser

1Choose one of the example snippets, or type your own Python code in the editor.
2Press Tab to indent (the editor inserts 4 spaces automatically).
3Click '▶ Run' to execute your code.
4Read the output in the dark terminal panel below. Errors are shown in red.
5Click 'Clear output' to reset the terminal before the next run.

Frequently Asked Questions

Which Python packages are available?+

NumPy, and the full Python standard library (math, json, re, datetime, collections, itertools, functools, etc.). For additional packages, use micropip: import micropip; await micropip.install('package-name').

Can I use print() to see output?+

Yes. The runner captures stdout and displays it in the terminal panel below the editor. print() works exactly as you'd expect.

Why does it take a few seconds to start?+

Pyodide is a ~10 MB WebAssembly bundle that has to download and initialise the first time. After that, execution is fast.

Is my code sent to a server?+

No. Pyodide runs Python entirely in your browser using WebAssembly - your code never leaves your device.

Looking for a deeper guide on this topic? Browse the Searchlight blog.

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