# 인자 이름 지정

### Python

<code>
def slope(p1=(0,0), p2=(1,1)):
  return (float(p2[1] - p1[1])) / (p2[0] - p1[0])
</code>

### Clojure

<code clojure>
(defn slope
  [& {:keys [p1 p2] :or {p1 [0 0] p2 [1 1]}}]
  (float (/ (- (p2 1) (p1 1))
            (- (p2 0) (p1 0)))))
</code>