PyScript wouldn’t be possible without building on top of a recent version of Pyodide—a CPython interpreter compiled with emscripten to WebAssembly, enabling Python to run in the browser.

Playwright, a Python library, allows developers to essentially control the browser with a few lines of Python code to automate cross-browser testing for single-page web apps and Progressive Web Apps.

A new project from Anaconda delivers the Python runtime in a web page, via a single JS include, and with access to many popular Python packages.

Reflex has built an open source framework to make it easy to turn Python code into a we app. Today it announced a $5M seed investment.

Jul 04, 2025 12:55:00 Mozilla releases 'Wasm agents' that allow AI agents to be run directly in the browser without the need to install extra apps, and uses WebAssembly to run Python-based agents ...

It's possible to take a step further with a browser extension, but this is a basic Python project that hosts a web page that you can drag and drop a file on for a visualizer.