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As well as a number of other rather useful languages [1].

Now days I use RMarkdown even for experiments because it's nice to document my line of thinking as I write the code and get a nicely formatted output when I'm finished.

[1] http://yihui.name/knitr/demo/engines/

I saw the Python examples provided awhile ago and they looked hacky. It might be worth taking another look, though.

I prefer make the notebooks portable, which I can't do if they are published on Rpubs.

I still feel the REPL-like environment in Jupyter is more suitable for building an idea, while RMarkdown is better for publishing it.