This is ideal for tutorials and documentation, where example Python code can actually be tried in the browser.
It requires Silverlight 2, and the Python version is 2.5.
Target browsers are Firefox 2 & 3, Safari and IE 7 & 8. (It won't work in other browsers until there is a version of Silverlight that works with them.)
Silverlight 2 is currently only available for Windows and Mac OS X, with the Firefox, Safari or IE browsers. Linux support is in the works via the Moonlight project from Mono.