Yep, when I was trying to understand the fuss about monoids (I blame Gabriel Gonzales excelent talk [1]), I made myself a little toy EDSL for configuration in Python, that was made mostly by implementing mappend for dictionaries [3] :)

[1] https://www.youtube.com/watch?v=WsA7GtUQeB8 [2] http://notes.asaleh.net/posts/monoid-pattern-in-python/ [3] http://notes.asaleh.net/posts/monoid-for-specifying-configur...