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Re:First Impressions of Python from a Java Developer by jcromartie on Monday November 08, 2010 @05:15PM (#1884261)
Or Clojure... (or... or... or...)

    (map :username (filter admin? all-users))
Re:First Impressions of Python from a Java Developer by Scriptor on Monday November 08, 2010 @06:19PM (#1884477)
Or Clojure again

    (for [username all-users] :when (admin? username))