Try pyjs

The REPL below runs Python with pyjs in your browser (xeus-python kernel in JupyterLite). For a full fledged example, open the tour of the Python API in JupyterLite, or see how synchronous Python code can wait for JavaScript promises (pyjs.run_sync).

Try pyjs

64 bit (wasm64)

All of this also exists as a 64 bit build (wasm64, can use more than 4 GB of memory, needs a browser with WebAssembly memory64 support): JupyterLite with the wasm64 Python kernel, e.g. the tour of the Python API.

From JavaScript

pyjs can also be used from JavaScript: the tour of the JavaScript API runs in the JavaScript kernel of jupyterlite-javascript-kernel (the notebook uses the IFrame runtime, it also works with the Web Worker runtime). It loads the pyjs runtime (pyjs_runtime_browser.js / .wasm) and a packed environment, deployed next to the JupyterLite in pyjs-runtime/wasm32/ and pyjs-runtime/wasm64/ (the wasm64 one when the browser supports memory64).