Combined with Silverlight, Gestalt allows web developers to directly embed Python and Ruby code in their HTML. When you view the source of a site, you will see something very familiar: ...

It allows developers to write and run Python code in HTML, and call Javascript libraries in PyScript. This system allows a website to be written entirely in Python.

Embedding the interpreter in three lines of code is easy enough, but let's face it, just executing arbitrary strings of Python code inside a program is neither interesting nor all that useful.