Hy: python+clojure (see: hylang.org)

core.hy

#!/usr/bin/env hy

(import [operator [eq]]
        [itertools [chain count]]
        [functools [partial reduce]])


(defn map-indexed [f coll]
  (map f (count) coll))

(defn mapcat [f &rest colls]
  (apply chain (apply (partial map f) colls)))

(defn contains? [v coll]
  (some (partial eq v) coll))


(defmain [&rest args]
  (let [[name (first args)]
        [argv (rest args)]]
    (->> argv
         (map-indexed (fn [i v] (.format "{}: {}" i v)))
         (.join "\n")
         (print))))


;; => (list (take 5 (map-indexed * (count))))
;; [0, 1, 4, 9, 16]

;; => (list (mapcat (fn [x] (-> x reversed list)) [[3 2 1 0] [6 5 4] [9 8 7]]))
;; [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

;; => (contains? 42 (count))
;; True

;; (env) $ hy core.hy hello world
;; 0: hello
;; 1: world