Grumpy: Go Running Python! (or a Python-to-Go Source Code Transcompiler and Runtime) This project from Google, just announced yesterday, is hot -- it's the top trending project on GitHub today, having ...

PyScript lets you run Python scripts right in the browser, side by side with JavaScript, with two-way interaction between your code and the web page.

With trinket.io, you can run python scripts in your browser. Even cooler is that they also run on your phone.