One place would be the Aspen web framework which puts Python code, templates and JSON in a same file with its simplates concept [1]. Each language stays in a s

One place would be the Aspen web framework which puts Python code, templates and JSON in a same file with its simplates concept [1]. Each language stays in a separate section so no mixing of logic and presentation, but no reason to separate them either, out of HTTP request/response handling context. An editor supporting this could make it easier to develop web apps with both static HTML and JS enabled browser. Apparently Eco also supports visualization and IPython in some way (according to project changelog)[2]. That is very interesting, actually. [1] http://aspen.io/simplates/ http://aspen.io/simplates/ [2] https://bitbucket.org/softdevteam/eco https://bitbucket.org/softdevteam/eco