Their project is called Bokeh and it's available publicly on GitHub. There are some cool ideas there, however I wouldn't call it lightweight and it is a certain

Their project is called Bokeh and it's available publicly on GitHub. There are some cool ideas there, however I wouldn't call it lightweight and it is a certain bit messy. We are currently starting to implement a somewhat similar JS/Python web framework with AngularJS on the client side, see my comment above :)