CoffeeScript is a simple, clean, fast language which compiles to JavaScript, either at build time, with a caching framework plugin on the server, or at runtime in the browser.

The syntax looks like a cross between Python and Haskell and, generally speaking, is used similarly enough to Python that you’ll have little trouble picking it up and using it comfortably.

Read the full thing at http://blog.ssokolow.com/archives/2011/05/07/a-python-programmers-first-impression-of-coffeescript/