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In the dynamic languages world this is done with monkey patching. If you invent a declarative way to monkey patch your code, you've got AOP as done in Spring.

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I believe emacs lisp's advice system is an AOP system in a highly dynamic language, and doesn't make much use of monkey-patching.

Advice/AOP is a pattern that can fit (if you want it) in dynamic language as well.

What about this Clojure library?

https://github.com/technomancy/robert-hooke

Don't forget AOP can work on top of compiled classes, not sure I'd there is an equivalent in python or ruby.

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