Emacs pour le développement

(define (foo x)
  (+ x (* x x)))

(defun factorial (n)
  (if (zerop n)
      1
    (* n (factorial (- n 1)))))

(list (factorial 12) (version))

(require 'ob-scheme)
(require 'ob-python)

(define (factorial n)
  (if (zero? n)
      1
      (* n (factorial (- n 1)))))

(list (factorial 12) (version))

import sys

def factorial(n):
    if n == 0:
        return 1
    else:
        return n * factorial(n - 1)

return [ factorial(12), sys.version ]