Actually, you're right. Python's functionality is pretty close to C#'s. Clojure just happens to be the language that introduced the concept of non-single-clas

Actually, you're right. Python's functionality is pretty close to C#'s. Clojure just happens to be the language that introduced the concept of non-single-class polymorphism to me. Rich Hickey's pretty open about the fact that there's very few original ideas in Clojure. When he presented the new reader/EDN features of Clojure 1.4, someone in the crowd told him it was very similar to YAML. He said "I didn't know that, I ripped it off Erlang, but I'm sure other people have had the same idea." (words to that effect)