Now that pyodide is mature, we can test a single snippet from Python 3.9 to 3.14 in a web page, it's quite handy.

There are other projects like this, some with full notebooks capabilities. This one is more oriented towards snippet sharing like jsfiddle.

It has a virtual file system, so you actually can use sqlite!

It also means in the future, one could add multiple module supports, and pip install (albeit with a proxy) and numpy support.