[chapmanb]

I learned Clojure with Joy of Clojure, the early access version, coming from a Python background with very little practical experience in Java or Lisp. It's an excellent book.

The biggest advantage for my coding has actually been in my day-to-day Python work, where I'm much improved at designing functionally, parallelizing with multiprocessing, and building decorators and context functions to remove boilerplate code. So my Python is faster and cleaner; this is all thanks to being able to to think better about code design after working in Clojure.

For a good example of "why Clojure" take a look at Cascalog:

https://www.assembla.com/wiki/show/d9Z8_q-Omr35zteJe5cbLr

which leverages Hadoop/Cascading Java libraries and combines them with a Lisp-style custom query language.

[edanm]

Interesting. Would you say that it's worth reading, even if I don't intend to program Clojure at all in the next few years, but I am a Python programmer?

[chapmanb]

I would say that learning Lisp is definitely worthwhile and will improve your Python coding; pg's essay argues for Lisp better than I could:

http://www.paulgraham.com/avg.html

You'll want to not just read a book, but also get hands on experience with the language. That's where I found Clojure a good choice for me since I could work on problems of interest to my work and reuse existing Java libraries.

Joy of Clojure also presents a persuasive argument in the opening chapter for Clojure, Lisp and functional programming. There is a pdf of that chapter available for free from the author's website:

http://joyofclojure.com/