Very nice. I really like how it pretty prints python objects. I wish it was a bit more "repl"-y, but the quick auto-evaluation helps make up for that.

I currently use https://repl.it/ for an in browser interpreter/repl.

Currently supports Python, Ruby and Brainfuck. Guide to adding new interpreter:

https://github.com/fatiherikli/fil#adding-new-interpreter

The BrainFuck interpreter doesn't seem to work properly. For example, I tried

    ++++++++++[->+++++++<].

Which multiplies 10x7 and should print "F" (ascii 70). Nothing appears to print.

I have a K interpreter[1] that could be adapted fairly easy to a system like this. Other good candidates include JSForth[2] and NGN APL[3].

[1] https://github.com/JohnEarnest/ok

[2] http://home.diphi.com/users/jeffr/forth/jsforth.html

[3] https://github.com/ngn/apl

> Nothing appears to print.

Maybe this is a line buffering issue?

The interface of the text editor is beautiful, and it's done using a surprisingly minimal amount of CSS.

Oh, nice ... it might be worth having Brython too, since it and Skulpt both cover different areas of python (and use different methodologies).

Does it re-evaluate the complete thing at every change? Or is it smarter, and only recomputes things that need recomputation?

Yes, source code is re-evaluating for every change now. It may be improved in the future.