Show HN: Online Python Compiler with Libraries (opens in new tab)

Maker here! Runs in an isolated Web Worker using Web Assembly, via Pyodide. Everything runs locally in your browser - no file system or other access. Scheduled run (paid plan) run on AWS lambda.

So, yes, sadly, network requests only work with domains with Access-Control-Allow-Origin: *. I'm looking at adding a backend CORS proxy to fix this.

We also have a Chrome extension with no CORS limitation. The extension lets you right-click Python code snippets on basically any site (Claude, ChatGPT, Deepseek etc.) to run it instantly.

https://chromewebstore.google.com/detail/python-code-runner/...

Yes, it has all the normal CORS restrictions. If you're curious, the PR that added support for this is here: https://github.com/urllib3/urllib3/pull/3195

It runs on pyodide, i.e, a wasm interpreter that runs entirely in your browser.

Maker here.

You're right, it's an interpreter and that would be the 100% accurate term.

For online coding environments, the two are often used interchangeably. More people search for 'compiler', so I'm using that widely on my site.

Yes! To use pylan:

- Click on the Clip name (the default one is 'Use Python Libraries') - Click 'Manage packages' - Enter 'pylan-lib' and Click 'Add' - Click 'Run'

The package will be installed, and the code will run!

The list of libraries is only a small subset of the compatible libraries - I should make that way clearer.

Maker here. Thank you!

I looked briefly at Marimo when building - awesome project. I wasn't sure about building on Pydodide as it's obviously not full Python compatibility. But seeing someone else building a popular project on it helped me make that decision!