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And also to "make use of [Python's] extensive, 'batteries included' libraries"

That's what seems the real benefit of it to me. Maybe Python will become not just a language, but a platform, like JVM or CLR, supporting multiple languages.

You can use Clojurescript on top of Node.js to achieve that. I never tried it so I don't have first hand experience.

https://github.com/clojure/clojurescript/wiki

How does it accomplish that better than say, clojurescript+node?