> (set ‘l ‘(("a" "b") ("c" "d")))
(("a" "b") ("c" "d"))
> (lookup "a" l)
"b"
lookup只返回value
> (assoc "a" l)
("a" "b")
返回key/value的
用pop-assoc
> (pop-assoc "a" l)
("a" "b")
> l
(("c" "d"))
原文：http://blog.csdn.net/csfreebird/article/details/43736631